[PATCH] uml: switch_mm fix

Ben Lahaise · Linus Torvalds · commit e763b793f7e5 · 2005-11-07T07:53:31.000-08:00
Not quite, something along the lines of the patch below works correctly (and
makes aio performance not suffer from multiple second delays), as skas0 mode
correctly switches mm contexts, unlike TT (which should probably get nuked
from the kernel now that skas0 seems to be working).

Signed-off-by: Benjamin LaHaise &lt;bcrl@linux.intel.com&gt;
Signed-off-by: Jeff Dike &lt;jdike@addtoit.com&gt;
Cc: Paolo Giarrusso &lt;blaisorblade@yahoo.it&gt;
Signed-off-by: Andrew Morton &lt;akpm@osdl.org&gt;
Signed-off-by: Linus Torvalds &lt;torvalds@osdl.org&gt;
diff --git a/include/asm-um/mmu_context.h b/include/asm-um/mmu_context.h
@@ -29,7 +29,8 @@ static inline void activate_mm(struct mm_struct *old, struct mm_struct *new)
 	 * possible.
 	 */
 	if (old != new && (current->flags & PF_BORROWED_MM))
-		force_flush_all();
+		CHOOSE_MODE(force_flush_all(),
+			    switch_mm_skas(&new->context.skas.id));
 }
 
 static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, 

Original file line number	Diff line number	Diff line change
`@@ -29,7 +29,8 @@ static inline void activate_mm(struct mm_struct old, struct mm_struct new)`
`29`	`29`	`* possible.`
`30`	`30`	`*/`
`31`	`31`	`if (old != new && (current->flags & PF_BORROWED_MM))`
`32`		`- force_flush_all();`
	`32`	`+ CHOOSE_MODE(force_flush_all(),`
	`33`	`+ switch_mm_skas(&new->context.skas.id));`
`33`	`34`	`}`
`34`	`35`
`35`	`36`	`static inline void switch_mm(struct mm_struct prev, struct mm_struct next,`