diff options
| author | Oleg Nesterov <oleg@redhat.com> | 2012-07-29 20:22:49 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2012-07-30 11:27:25 +0200 |
| commit | 194f8dcbe9629d8e9346cf96345a9c0bbf0e67ae (patch) | |
| tree | 10aac2913ee4f9263af68c42682c456788d990fe /kernel | |
| parent | 57683f72b8c01c53c85fe13e82fe1feb3a06bcd5 (diff) | |
| download | lwn-194f8dcbe9629d8e9346cf96345a9c0bbf0e67ae.tar.gz lwn-194f8dcbe9629d8e9346cf96345a9c0bbf0e67ae.zip | |
uprobes: __replace_page() needs munlock_vma_page()
Like do_wp_page(), __replace_page() should do munlock_vma_page()
for the case when the old page still has other !VM_LOCKED
mappings. Unfortunately this needs mm/internal.h.
Also, move put_page() outside of ptl lock. This doesn't really
matter but looks a bit better.
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: Srikar Dronamraju <srikar.vnet.ibm.com>
Cc: Anton Arapov <anton@redhat.com>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Link: http://lkml.kernel.org/r/20120729182249.GA20372@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/events/uprobes.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c index bb30a4fc5050..c08a22d02f72 100644 --- a/kernel/events/uprobes.c +++ b/kernel/events/uprobes.c @@ -32,6 +32,7 @@ #include <linux/swap.h> /* try_to_free_swap */ #include <linux/ptrace.h> /* user_enable_single_step */ #include <linux/kdebug.h> /* notifier mechanism */ +#include "../../mm/internal.h" /* munlock_vma_page */ #include <linux/uprobes.h> @@ -141,7 +142,7 @@ static int __replace_page(struct vm_area_struct *vma, unsigned long addr, pte_t *ptep; int err; - /* freeze PageSwapCache() for try_to_free_swap() below */ + /* For try_to_free_swap() and munlock_vma_page() below */ lock_page(page); err = -EAGAIN; @@ -164,9 +165,12 @@ static int __replace_page(struct vm_area_struct *vma, unsigned long addr, page_remove_rmap(page); if (!page_mapped(page)) try_to_free_swap(page); - put_page(page); pte_unmap_unlock(ptep, ptl); + if (vma->vm_flags & VM_LOCKED) + munlock_vma_page(page); + put_page(page); + err = 0; unlock: unlock_page(page); |