![Mel Gorman](/assets/img/avatar_default.png)
Ordinarily the size of a pageblock is determined at compile-time based on the hugepage size. On PPC64, the hugepage size is determined at runtime based on what is supported by the machine. With legacy machines such as iSeries that do not support hugepages, HPAGE_SHIFT is 0. This results in pageblock_order being set to -PAGE_SHIFT and a crash results shortly afterwards. This patch adds a function to select a sensible value for pageblock order by default when HUGETLB_PAGE_SIZE_VARIABLE is set. It checks that HPAGE_SHIFT is a sensible value before using the hugepage size; if it is not MAX_ORDER-1 is used. This is a fix for 2.6.24. Credit goes to Stephen Rothwell for identifying the bug and testing candidate patches. Additional credit goes to Andy Whitcroft for spotting a problem with respects to IA-64 before releasing. Additional credit to David Gibson for testing with the libhugetlbfs test suite. Signed-off-by: Mel Gorman <mel@csn.ul.ie> Tested-by: Stephen Rothwell <sfr@canb.auug.org.au> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Acked-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
697 lines
17 KiB
Text
697 lines
17 KiB
Text
# For a description of the syntax of this configuration file,
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# see Documentation/kbuild/kconfig-language.txt.
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#
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mainmenu "Linux/PowerPC Kernel Configuration"
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source "arch/powerpc/platforms/Kconfig.cputype"
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config PPC32
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bool
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default y if !PPC64
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config 64BIT
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bool
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default y if PPC64
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config WORD_SIZE
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int
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default 64 if PPC64
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default 32 if !PPC64
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config PPC_MERGE
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def_bool y
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config MMU
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bool
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default y
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config GENERIC_CMOS_UPDATE
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def_bool y
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config GENERIC_TIME
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def_bool y
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config GENERIC_TIME_VSYSCALL
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def_bool y
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config GENERIC_CLOCKEVENTS
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def_bool y
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config GENERIC_HARDIRQS
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bool
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default y
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config IRQ_PER_CPU
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bool
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default y
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config RWSEM_GENERIC_SPINLOCK
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bool
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config RWSEM_XCHGADD_ALGORITHM
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bool
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default y
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config ARCH_HAS_ILOG2_U32
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bool
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default y
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config ARCH_HAS_ILOG2_U64
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bool
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default y if 64BIT
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config GENERIC_HWEIGHT
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bool
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default y
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config GENERIC_CALIBRATE_DELAY
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bool
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default y
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config GENERIC_FIND_NEXT_BIT
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bool
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default y
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config ARCH_NO_VIRT_TO_BUS
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def_bool PPC64
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config PPC
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bool
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default y
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config EARLY_PRINTK
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bool
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default y
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config COMPAT
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bool
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default y if PPC64
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config SYSVIPC_COMPAT
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bool
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depends on COMPAT && SYSVIPC
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default y
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# All PPC32s use generic nvram driver through ppc_md
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config GENERIC_NVRAM
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bool
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default y if PPC32
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config SCHED_NO_NO_OMIT_FRAME_POINTER
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bool
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default y
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config ARCH_MAY_HAVE_PC_FDC
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bool
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default !PPC_PSERIES || PCI
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config PPC_OF
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def_bool y
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config OF
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def_bool y
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config PPC_UDBG_16550
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bool
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default n
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config GENERIC_TBSYNC
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bool
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default y if PPC32 && SMP
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default n
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config AUDIT_ARCH
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bool
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default y
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config GENERIC_BUG
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bool
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default y
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depends on BUG
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config SYS_SUPPORTS_APM_EMULATION
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default y if PMAC_APM_EMU
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bool
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config DEFAULT_UIMAGE
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bool
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help
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Used to allow a board to specify it wants a uImage built by default
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default n
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config PPC64_SWSUSP
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bool
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depends on PPC64 && (BROKEN || (PPC_PMAC64 && EXPERIMENTAL))
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default y
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config PPC_DCR_NATIVE
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bool
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default n
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config PPC_DCR_MMIO
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bool
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default n
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config PPC_DCR
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bool
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depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
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default y
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config PPC_OF_PLATFORM_PCI
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bool
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depends on PPC64 # not supported on 32 bits yet
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default n
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source "init/Kconfig"
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source "arch/powerpc/platforms/Kconfig"
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menu "Kernel options"
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config HIGHMEM
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bool "High memory support"
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depends on PPC32
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source kernel/time/Kconfig
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source kernel/Kconfig.hz
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source kernel/Kconfig.preempt
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source "fs/Kconfig.binfmt"
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# We optimistically allocate largepages from the VM, so make the limit
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# large enough (16MB). This badly named config option is actually
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# max order + 1
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config FORCE_MAX_ZONEORDER
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int
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depends on PPC64
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default "9" if PPC_64K_PAGES
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default "13"
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config HUGETLB_PAGE_SIZE_VARIABLE
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bool
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depends on HUGETLB_PAGE
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default y
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config MATH_EMULATION
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bool "Math emulation"
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depends on 4xx || 8xx || E200 || PPC_MPC832x || E500
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---help---
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Some PowerPC chips designed for embedded applications do not have
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a floating-point unit and therefore do not implement the
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floating-point instructions in the PowerPC instruction set. If you
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say Y here, the kernel will include code to emulate a floating-point
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unit, which will allow programs that use floating-point
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instructions to run.
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config 8XX_MINIMAL_FPEMU
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bool "Minimal math emulation for 8xx"
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depends on 8xx && !MATH_EMULATION
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help
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Older arch/ppc kernels still emulated a few floating point
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instructions such as load and store, even when full math
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emulation is disabled. Say "Y" here if you want to preserve
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this behavior.
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It is recommended that you build a soft-float userspace instead.
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config IOMMU_VMERGE
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bool "Enable IOMMU virtual merging"
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depends on PPC64
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default y
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help
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Cause IO segments sent to a device for DMA to be merged virtually
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by the IOMMU when they happen to have been allocated contiguously.
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This doesn't add pressure to the IOMMU allocator. However, some
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drivers don't support getting large merged segments coming back
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from *_map_sg().
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Most drivers don't have this problem; it is safe to say Y here.
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config HOTPLUG_CPU
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bool "Support for enabling/disabling CPUs"
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depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
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---help---
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Say Y here to be able to disable and re-enable individual
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CPUs at runtime on SMP machines.
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Say N if you are unsure.
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config ARCH_ENABLE_MEMORY_HOTPLUG
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def_bool y
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config KEXEC
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bool "kexec system call (EXPERIMENTAL)"
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depends on (PPC_PRPMC2800 || PPC_MULTIPLATFORM) && EXPERIMENTAL
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help
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kexec is a system call that implements the ability to shutdown your
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current kernel, and to start another kernel. It is like a reboot
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but it is independent of the system firmware. And like a reboot
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you can start any kernel with it, not just Linux.
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The name comes from the similarity to the exec system call.
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It is an ongoing process to be certain the hardware in a machine
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is properly shutdown, so do not be surprised if this code does not
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initially work for you. It may help to enable device hotplugging
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support. As of this writing the exact hardware interface is
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strongly in flux, so no good recommendation can be made.
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config CRASH_DUMP
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bool "Build a kdump crash kernel (EXPERIMENTAL)"
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depends on PPC_MULTIPLATFORM && PPC64 && EXPERIMENTAL
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help
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Build a kernel suitable for use as a kdump capture kernel.
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The kernel will be linked at a different address than normal, and
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so can only be used for Kdump.
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Don't change this unless you know what you are doing.
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config PPCBUG_NVRAM
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bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
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default y if PPC_PREP
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config IRQ_ALL_CPUS
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bool "Distribute interrupts on all CPUs by default"
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depends on SMP && !MV64360
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help
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This option gives the kernel permission to distribute IRQs across
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multiple CPUs. Saying N here will route all IRQs to the first
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CPU. Generally saying Y is safe, although some problems have been
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reported with SMP Power Macintoshes with this option enabled.
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config NUMA
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bool "NUMA support"
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depends on PPC64
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default y if SMP && PPC_PSERIES
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config NODES_SHIFT
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int
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default "4"
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depends on NEED_MULTIPLE_NODES
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config ARCH_SELECT_MEMORY_MODEL
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def_bool y
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depends on PPC64
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config ARCH_FLATMEM_ENABLE
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def_bool y
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depends on (PPC64 && !NUMA) || PPC32
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config ARCH_SPARSEMEM_ENABLE
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def_bool y
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depends on PPC64
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select SPARSEMEM_VMEMMAP_ENABLE
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config ARCH_SPARSEMEM_DEFAULT
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def_bool y
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depends on (SMP && PPC_PSERIES) || PPC_PS3
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config ARCH_POPULATES_NODE_MAP
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def_bool y
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source "mm/Kconfig"
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config ARCH_MEMORY_PROBE
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def_bool y
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depends on MEMORY_HOTPLUG
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# Some NUMA nodes have memory ranges that span
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# other nodes. Even though a pfn is valid and
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# between a node's start and end pfns, it may not
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# reside on that node. See memmap_init_zone()
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# for details.
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config NODES_SPAN_OTHER_NODES
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def_bool y
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depends on NEED_MULTIPLE_NODES
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config PPC_HAS_HASH_64K
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bool
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depends on PPC64
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default n
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config PPC_64K_PAGES
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bool "64k page size"
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depends on PPC64
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select PPC_HAS_HASH_64K
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help
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This option changes the kernel logical page size to 64k. On machines
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without processor support for 64k pages, the kernel will simulate
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them by loading each individual 4k page on demand transparently,
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while on hardware with such support, it will be used to map
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normal application pages.
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config SCHED_SMT
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bool "SMT (Hyperthreading) scheduler support"
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depends on PPC64 && SMP
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help
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SMT scheduler support improves the CPU scheduler's decision making
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when dealing with POWER5 cpus at a cost of slightly increased
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overhead in some places. If unsure say N here.
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config PROC_DEVICETREE
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bool "Support for device tree in /proc"
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depends on PROC_FS
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help
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This option adds a device-tree directory under /proc which contains
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an image of the device tree that the kernel copies from Open
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Firmware or other boot firmware. If unsure, say Y here.
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config CMDLINE_BOOL
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bool "Default bootloader kernel arguments"
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config CMDLINE
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string "Initial kernel command string"
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depends on CMDLINE_BOOL
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default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
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help
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On some platforms, there is currently no way for the boot loader to
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pass arguments to the kernel. For these platforms, you can supply
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some command-line options at build time by entering them here. In
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most cases you will need to specify the root device here.
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if !44x || BROKEN
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source kernel/power/Kconfig
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endif
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config SECCOMP
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bool "Enable seccomp to safely compute untrusted bytecode"
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depends on PROC_FS
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default y
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help
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This kernel feature is useful for number crunching applications
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that may need to compute untrusted bytecode during their
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execution. By using pipes or other transports made available to
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the process as file descriptors supporting the read/write
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syscalls, it's possible to isolate those applications in
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their own address space using seccomp. Once seccomp is
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enabled via /proc/<pid>/seccomp, it cannot be disabled
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and the task is only allowed to execute a few safe syscalls
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defined by each seccomp mode.
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If unsure, say Y. Only embedded should say N here.
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config WANT_DEVICE_TREE
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bool
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default n
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config DEVICE_TREE
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string "Static device tree source file"
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depends on WANT_DEVICE_TREE
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help
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This specifies the device tree source (.dts) file to be
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compiled and included when building the bootwrapper. If a
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relative filename is given, then it will be relative to
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arch/powerpc/boot/dts. If you are not using the bootwrapper,
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or do not need to build a dts into the bootwrapper, this
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field is ignored.
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For example, this is required when building a cuImage target
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for an older U-Boot, which cannot pass a device tree itself.
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Such a kernel will not work with a newer U-Boot that tries to
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pass a device tree (unless you tell it not to). If your U-Boot
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does not mention a device tree in "help bootm", then use the
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cuImage target and specify a device tree here. Otherwise, use
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the uImage target and leave this field blank.
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endmenu
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config ISA_DMA_API
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bool
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default y
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menu "Bus options"
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config ISA
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bool "Support for ISA-bus hardware"
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depends on PPC_PREP || PPC_CHRP
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select PPC_I8259
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help
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Find out whether you have ISA slots on your motherboard. ISA is the
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name of a bus system, i.e. the way the CPU talks to the other stuff
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inside your box. If you have an Apple machine, say N here; if you
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have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
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you have an embedded board, consult your board documentation.
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config ZONE_DMA
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bool
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default y
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config GENERIC_ISA_DMA
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bool
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depends on PPC64 || POWER4 || 6xx && !CPM2
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default y
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config PPC_INDIRECT_PCI
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bool
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depends on PCI
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default y if 40x || 44x
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default n
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config EISA
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bool
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config SBUS
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bool
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config FSL_SOC
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bool
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config FSL_PCI
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bool
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select PPC_INDIRECT_PCI
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# Yes MCA RS/6000s exist but Linux-PPC does not currently support any
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config MCA
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bool
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config PCI
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bool "PCI support" if 40x || CPM2 || PPC_83xx || PPC_85xx || PPC_86xx \
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|| PPC_MPC52xx || (EMBEDDED && (PPC_PSERIES || PPC_ISERIES)) \
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|| PPC_PS3
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default y if !40x && !CPM2 && !8xx && !PPC_83xx \
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&& !PPC_85xx && !PPC_86xx
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default PCI_PERMEDIA if !4xx && !CPM2 && !8xx
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default PCI_QSPAN if !4xx && !CPM2 && 8xx
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select ARCH_SUPPORTS_MSI
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help
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Find out whether your system includes a PCI bus. PCI is the name of
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a bus system, i.e. the way the CPU talks to the other stuff inside
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your box. If you say Y here, the kernel will include drivers and
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infrastructure code to support PCI bus devices.
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config PCI_DOMAINS
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def_bool PCI
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config PCI_SYSCALL
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def_bool PCI
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config PCI_QSPAN
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bool "QSpan PCI"
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depends on !4xx && !CPM2 && 8xx
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select PPC_I8259
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help
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Say Y here if you have a system based on a Motorola 8xx-series
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embedded processor with a QSPAN PCI interface, otherwise say N.
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config PCI_8260
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bool
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depends on PCI && 8260
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select PPC_INDIRECT_PCI
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default y
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config 8260_PCI9
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bool "Enable workaround for MPC826x erratum PCI 9"
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depends on PCI_8260 && !8272
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default y
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choice
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prompt "IDMA channel for PCI 9 workaround"
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depends on 8260_PCI9
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config 8260_PCI9_IDMA1
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bool "IDMA1"
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config 8260_PCI9_IDMA2
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bool "IDMA2"
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config 8260_PCI9_IDMA3
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bool "IDMA3"
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config 8260_PCI9_IDMA4
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bool "IDMA4"
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endchoice
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source "drivers/pci/pcie/Kconfig"
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source "drivers/pci/Kconfig"
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source "drivers/pcmcia/Kconfig"
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source "drivers/pci/hotplug/Kconfig"
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endmenu
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menu "Advanced setup"
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depends on PPC32
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config ADVANCED_OPTIONS
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bool "Prompt for advanced kernel configuration options"
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help
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This option will enable prompting for a variety of advanced kernel
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configuration options. These options can cause the kernel to not
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work if they are set incorrectly, but can be used to optimize certain
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aspects of kernel memory management.
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Unless you know what you are doing, say N here.
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comment "Default settings for advanced configuration options are used"
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depends on !ADVANCED_OPTIONS
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config HIGHMEM_START_BOOL
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bool "Set high memory pool address"
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depends on ADVANCED_OPTIONS && HIGHMEM
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help
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This option allows you to set the base address of the kernel virtual
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area used to map high memory pages. This can be useful in
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optimizing the layout of kernel virtual memory.
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Say N here unless you know what you are doing.
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config HIGHMEM_START
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hex "Virtual start address of high memory pool" if HIGHMEM_START_BOOL
|
|
default "0xfe000000"
|
|
|
|
config LOWMEM_SIZE_BOOL
|
|
bool "Set maximum low memory"
|
|
depends on ADVANCED_OPTIONS
|
|
help
|
|
This option allows you to set the maximum amount of memory which
|
|
will be used as "low memory", that is, memory which the kernel can
|
|
access directly, without having to set up a kernel virtual mapping.
|
|
This can be useful in optimizing the layout of kernel virtual
|
|
memory.
|
|
|
|
Say N here unless you know what you are doing.
|
|
|
|
config LOWMEM_SIZE
|
|
hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
|
|
default "0x30000000"
|
|
|
|
config KERNEL_START_BOOL
|
|
bool "Set custom kernel base address"
|
|
depends on ADVANCED_OPTIONS
|
|
help
|
|
This option allows you to set the kernel virtual address at which
|
|
the kernel will map low memory (the kernel image will be linked at
|
|
this address). This can be useful in optimizing the virtual memory
|
|
layout of the system.
|
|
|
|
Say N here unless you know what you are doing.
|
|
|
|
config KERNEL_START
|
|
hex "Virtual address of kernel base" if KERNEL_START_BOOL
|
|
default "0xc0000000"
|
|
|
|
config TASK_SIZE_BOOL
|
|
bool "Set custom user task size"
|
|
depends on ADVANCED_OPTIONS
|
|
help
|
|
This option allows you to set the amount of virtual address space
|
|
allocated to user tasks. This can be useful in optimizing the
|
|
virtual memory layout of the system.
|
|
|
|
Say N here unless you know what you are doing.
|
|
|
|
config TASK_SIZE
|
|
hex "Size of user task space" if TASK_SIZE_BOOL
|
|
default "0x80000000" if PPC_PREP || PPC_8xx
|
|
default "0xc0000000"
|
|
|
|
config CONSISTENT_START_BOOL
|
|
bool "Set custom consistent memory pool address"
|
|
depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
|
|
help
|
|
This option allows you to set the base virtual address
|
|
of the consistent memory pool. This pool of virtual
|
|
memory is used to make consistent memory allocations.
|
|
|
|
config CONSISTENT_START
|
|
hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
|
|
default "0xfd000000" if (NOT_COHERENT_CACHE && 8xx)
|
|
default "0xff100000" if NOT_COHERENT_CACHE
|
|
|
|
config CONSISTENT_SIZE_BOOL
|
|
bool "Set custom consistent memory pool size"
|
|
depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
|
|
help
|
|
This option allows you to set the size of the
|
|
consistent memory pool. This pool of virtual memory
|
|
is used to make consistent memory allocations.
|
|
|
|
config CONSISTENT_SIZE
|
|
hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
|
|
default "0x00200000" if NOT_COHERENT_CACHE
|
|
|
|
config BOOT_LOAD_BOOL
|
|
bool "Set the boot link/load address"
|
|
depends on ADVANCED_OPTIONS && !PPC_MULTIPLATFORM
|
|
help
|
|
This option allows you to set the initial load address of the zImage
|
|
or zImage.initrd file. This can be useful if you are on a board
|
|
which has a small amount of memory.
|
|
|
|
Say N here unless you know what you are doing.
|
|
|
|
config BOOT_LOAD
|
|
hex "Link/load address for booting" if BOOT_LOAD_BOOL
|
|
default "0x00400000" if 40x || 8xx || 8260
|
|
default "0x01000000" if 44x
|
|
default "0x00800000"
|
|
|
|
config PIN_TLB
|
|
bool "Pinned Kernel TLBs (860 ONLY)"
|
|
depends on ADVANCED_OPTIONS && 8xx
|
|
endmenu
|
|
|
|
if PPC64
|
|
config KERNEL_START
|
|
hex
|
|
default "0xc000000000000000"
|
|
endif
|
|
|
|
source "net/Kconfig"
|
|
|
|
source "drivers/Kconfig"
|
|
|
|
source "fs/Kconfig"
|
|
|
|
# XXX source "arch/ppc/8xx_io/Kconfig"
|
|
|
|
# XXX source "arch/ppc/8260_io/Kconfig"
|
|
|
|
source "arch/powerpc/sysdev/qe_lib/Kconfig"
|
|
|
|
source "lib/Kconfig"
|
|
|
|
source "kernel/Kconfig.instrumentation"
|
|
|
|
source "arch/powerpc/Kconfig.debug"
|
|
|
|
source "security/Kconfig"
|
|
|
|
config KEYS_COMPAT
|
|
bool
|
|
depends on COMPAT && KEYS
|
|
default y
|
|
|
|
source "crypto/Kconfig"
|
|
|
|
config PPC_CLOCK
|
|
bool
|
|
default n
|
|
|
|
config PPC_LIB_RHEAP
|
|
bool
|
|
|