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[PATCH] uml: tlb flushing fix 

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 <jdike@addtoit.com>
Cc: <blaisorblade@yahoo.it>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Benjamin LaHaise 2005-07-12 13:58:22 -07:00 committed by Linus Torvalds
parent 8b8a9da525
commit c40504e87e
1 changed files with 4 additions and 0 deletions
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4
include/asm-um/mmu_context.h
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@ -16,8 +16,12 @@
#define deactivate_mm(tsk,mm) do { } while (0) #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) 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, static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,