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sh: Enable the mmu in start_secondary() 

For the boot, enable_mmu() is called from setup_arch() but we don't call
setup_arch() for any of the other cpus. So turn on the non-boot cpu's
mmu inside of start_secondary().

I noticed this bug on an SMP board when trying to map I/O memory
(smsc911x registers) into the kernel address space. Since the Address
Translation bit in MMUCR wasn't set, accessing the virtual address where
the smsc911x registers were supposedly mapped actually performed a
physical address access.

Signed-off-by: Matt Fleming <matt@console-pimps.org>
Cc: stable@kernel.org
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Matt Fleming 2010-03-28 20:08:25 +00:00 committed by Paul Mundt
parent d5ab780305
commit 4bea3418c7
1 changed files with 1 additions and 0 deletions
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arch/sh/kernel/smp.c
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@ -69,6 +69,7 @@ asmlinkage void __cpuinit start_secondary(void)
unsigned int cpu;
struct mm_struct *mm = &init_mm;
enable_mmu();
atomic_inc(&mm->mm_count);
atomic_inc(&mm->mm_users);
current->active_mm = mm;