![Tejun Heo](/assets/img/avatar_default.png)
64bit s390 shares the same problem with alpha regarding percpu symbol addressing from modules. It needs assembly magic to force GOTENT reference when building module as the percpu address will be outside the usual 4G range from the module text. This can be solved by using weak percpu variable definitions. This patch makes s390 use weak definitions and switch to dynamic percpu allocator. Please note that weak attribute is not added if !SMP as percpu variables behave exactly the same as normal variables on UP. Compile tested. Generation of GOTENT reference verified. This patch is based on Ivan Kokshaysky's alpha percpu patch. [ Impact: use dynamic percpu allocator ] Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
22 lines
595 B
C
22 lines
595 B
C
#ifndef __ARCH_S390_PERCPU__
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#define __ARCH_S390_PERCPU__
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/*
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* s390 uses its own implementation for per cpu data, the offset of
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* the cpu local data area is cached in the cpu's lowcore memory.
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*/
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#define __my_cpu_offset S390_lowcore.percpu_offset
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/*
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* For 64 bit module code, the module may be more than 4G above the
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* per cpu area, use weak definitions to force the compiler to
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* generate external references.
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*/
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#if defined(CONFIG_SMP) && defined(__s390x__) && defined(MODULE)
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#define ARCH_NEEDS_WEAK_PER_CPU
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#endif
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#include <asm-generic/percpu.h>
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#endif /* __ARCH_S390_PERCPU__ */
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