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Commit 5156ddce authored by Kumar Gala's avatar Kumar Gala
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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: default avatarKumar Gala <galak@kernel.crashing.org>
parent 4733fd32

arch/powerpc/mm/mmu_context_nohash.c

+1 −0
Original line number Diff line number Diff line
@@ -217,6 +217,7 @@ void switch_mmu_context(struct mm_struct *prev, struct mm_struct *next) 
			id = steal_context_smp(id);

			if (id == MMU_NO_CONTEXT)

				goto again;

			goto stolen;

		}

#endif /* CONFIG_SMP */

		id = steal_context_up(id);