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authorJeremy Fitzhardinge <jeremy@goop.org>2010-08-09 17:19:52 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2010-08-09 20:45:03 -0700
commit57250a5bf0f6ff68dc339572adbd881a11f366fa (patch)
treeef11c141a9f89403bcd4b1fc705d672c0ff41818 /mm
parent58c37f6e0dfaaab85a3c11fcbf24451dfe70c721 (diff)
mmu-notifiers: remove mmu notifier calls in apply_to_page_range()
It is not appropriate for apply_to_page_range() to directly call any mmu notifiers, because it is a general purpose function whose effect depends on what context it is called in and what the callback function does. In particular, if it is being used as part of an mmu notifier implementation, the recursive calls can be particularly problematic. It is up to apply_to_page_range's caller to do any notifier calls if necessary. It does not affect any in-tree users because they all operate on init_mm, and mmu notifiers only pertain to usermode mappings. [stefano.stabellini@eu.citrix.com: remove unused local `start'] Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Cc: Avi Kivity <avi@qumranet.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
-rw-r--r--mm/memory.c5
1 files changed, 2 insertions, 3 deletions
diff --git a/mm/memory.c b/mm/memory.c
index 1ecca56e0a48..858829d06a92 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -2006,11 +2006,10 @@ int apply_to_page_range(struct mm_struct *mm, unsigned long addr,
{
pgd_t *pgd;
unsigned long next;
- unsigned long start = addr, end = addr + size;
+ unsigned long end = addr + size;
int err;
BUG_ON(addr >= end);
- mmu_notifier_invalidate_range_start(mm, start, end);
pgd = pgd_offset(mm, addr);
do {
next = pgd_addr_end(addr, end);
@@ -2018,7 +2017,7 @@ int apply_to_page_range(struct mm_struct *mm, unsigned long addr,
if (err)
break;
} while (pgd++, addr = next, addr != end);
- mmu_notifier_invalidate_range_end(mm, start, end);
+
return err;
}
EXPORT_SYMBOL_GPL(apply_to_page_range);

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