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authorKumar Gala <galak@kernel.crashing.org>2009-07-30 00:04:25 -0400
committerKumar Gala <galak@kernel.crashing.org>2009-07-30 00:05:43 -0400
commit5156ddce6c0a152ee7ccab2c976c6a8abc8a49b5 (patch)
tree0782ea70dc80dd28d5081d5f53c28979ad6b022b /arch/powerpc
parent4733fd328f14280900435d9dbae1487d110a4d56 (diff)
powerpc/mm: Fix SMP issue with MMU context handling code
In switch_mmu_context() if we call steal_context_smp() to get a context to use we shouldn't fall through and than call steal_context_up(). Doing so can be problematic in that the 'mm' that steal_context_up() ends up using will not get marked dirty in the stale_map[] for other CPUs that might have used that mm. Thus we could end up with stale TLB entries in the other CPUs that can cause all kinda of havoc. Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc')
-rw-r--r--arch/powerpc/mm/mmu_context_nohash.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/powerpc/mm/mmu_context_nohash.c b/arch/powerpc/mm/mmu_context_nohash.c
index 92a197117d5b..b1a727def15b 100644
--- a/arch/powerpc/mm/mmu_context_nohash.c
+++ b/arch/powerpc/mm/mmu_context_nohash.c
@@ -217,6 +217,7 @@ void switch_mmu_context(struct mm_struct *prev, struct mm_struct *next)
217 id = steal_context_smp(id); 217 id = steal_context_smp(id);
218 if (id == MMU_NO_CONTEXT) 218 if (id == MMU_NO_CONTEXT)
219 goto again; 219 goto again;
220 goto stolen;
220 } 221 }
221#endif /* CONFIG_SMP */ 222#endif /* CONFIG_SMP */
222 id = steal_context_up(id); 223 id = steal_context_up(id);