* [PATCH] powerpc: Fix ppc32 mm_struct CPU tracking in SMP
@ 2008-11-28 6:05 Benjamin Herrenschmidt
0 siblings, 0 replies; only message in thread
From: Benjamin Herrenschmidt @ 2008-11-28 6:05 UTC (permalink / raw)
To: linuxppc-dev; +Cc: Kumar Gala
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 breaks the
merge of the RCU based page table freeing and other upcoming
32-bit embedded SMP work.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
---
arch/powerpc/include/asm/mmu_context.h | 3 +++
1 file changed, 3 insertions(+)
--- linux-476.orig/arch/powerpc/include/asm/mmu_context.h 2008-11-28 15:46:39.000000000 +1100
+++ linux-476/arch/powerpc/include/asm/mmu_context.h 2008-11-28 16:59:06.000000000 +1100
@@ -186,6 +186,9 @@ static inline void switch_mm(struct mm_s
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;
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2008-11-28 6:05 [PATCH] powerpc: Fix ppc32 mm_struct CPU tracking in SMP Benjamin Herrenschmidt
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