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powerpc: Fix ppc32 mm_struct CPU tracking in SMP 

The 32-bit hash code didn't need it so far so we don't update
mm->cpu_vm_mask on context switch.  This however will break when we
merge the RCU based page table freeing patch and other upcoming 32-bit
embedded SMP work, so this adds the update.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Benjamin Herrenschmidt 2008-11-27 20:05:05 +00:00 committed by Paul Mackerras
parent 1b98326b91
commit 4ee5f55175
1 changed files with 3 additions and 0 deletions
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3
arch/powerpc/include/asm/mmu_context.h
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@ -180,6 +180,9 @@ static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
tsk->thread.pgdir = next->pgd;
if (!cpu_isset(smp_processor_id(), next->cpu_vm_mask))
cpu_set(smp_processor_id(), next->cpu_vm_mask);
/* No need to flush userspace segments if the mm doesnt change */
if (prev == next)
return;