The patch titled
uml: tlb flushing fix
has been added to the -mm tree. Its filename is
uml-tlb-flushing-fix.patch
Patches currently in -mm which might be from [EMAIL PROTECTED] are
uml-tlb-flushing-fix.patch
From: Benjamin LaHaise <[EMAIL PROTECTED]>
This patch fixes a fairly serious tlb flushing bug that makes aio use under
uml very unreliable -- SEGVs, Oops and panic()s occur as a result of stale
tlb entires being used by uml when aio switches mms due to the fact that
uml does not implement the activate_mm() hook. This patch introduces a
simple but correct approach (read: hammer) for implementing activate_mm()
in uml by doing a force_flush_all() if the new mm is different from old.
With this patch in place, uml is able to succeed at the aio test case that
was randomly faulting for me before.
Cc: Jeff Dike <[EMAIL PROTECTED]>
Cc: <[EMAIL PROTECTED]>
Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
---
include/asm-um/mmu_context.h | 4 ++++
1 files changed, 4 insertions(+)
diff -puN include/asm-um/mmu_context.h~uml-tlb-flushing-fix
include/asm-um/mmu_context.h
--- 25/include/asm-um/mmu_context.h~uml-tlb-flushing-fix Mon Jul 11
15:01:15 2005
+++ 25-akpm/include/asm-um/mmu_context.h Mon Jul 11 15:01:15 2005
@@ -16,8 +16,12 @@
#define deactivate_mm(tsk,mm) do { } while (0)
+extern void force_flush_all(void);
+
static inline void activate_mm(struct mm_struct *old, struct mm_struct *new)
{
+ if (old != new)
+ force_flush_all();
}
static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
_
-
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