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| author | Hideo Saito <hsaito.ppc@gmail.com> | 2009-05-24 17:33:34 +0200 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2009-05-26 05:46:49 +0200 |
| commit | 8e35961b57da14cb64cb0e4e1b7e3aabda6396fe (patch) | |
| tree | a3382764e95b0b760e667f43ddd88d7628c746d7 /arch/powerpc/mm | |
| parent | Linux 2.6.30-rc7 (diff) | |
| download | linux-8e35961b57da14cb64cb0e4e1b7e3aabda6396fe.tar.xz linux-8e35961b57da14cb64cb0e4e1b7e3aabda6396fe.zip | |
powerpc/mm: Fix broken MMU PID stealing on !SMP
The recent rework of the MMU PID handling for non-hash CPUs has a
subtle bug in the !SMP "optimized" variant of the PID stealing
function. It clears the PID in the mm context before it calls
local_flush_tlb_mm(). However, the later will not flush anything
if the PID in the context is clear...
Signed-off-by: Hideo Saito <hsaito.ppc@gmail.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/mm')
| -rw-r--r-- | arch/powerpc/mm/mmu_context_nohash.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/arch/powerpc/mm/mmu_context_nohash.c b/arch/powerpc/mm/mmu_context_nohash.c index a70e311bd457..030d0005b4d2 100644 --- a/arch/powerpc/mm/mmu_context_nohash.c +++ b/arch/powerpc/mm/mmu_context_nohash.c @@ -127,12 +127,12 @@ static unsigned int steal_context_up(unsigned int id) pr_debug("[%d] steal context %d from mm @%p\n", cpu, id, mm); - /* Mark this mm has having no context anymore */ - mm->context.id = MMU_NO_CONTEXT; - /* Flush the TLB for that context */ local_flush_tlb_mm(mm); + /* Mark this mm has having no context anymore */ + mm->context.id = MMU_NO_CONTEXT; + /* XXX This clear should ultimately be part of local_flush_tlb_mm */ __clear_bit(id, stale_map[cpu]); |