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authorOleg Nesterov <oleg@redhat.com>2012-07-29 20:22:18 +0200
committerIngo Molnar <mingo@kernel.org>2012-07-30 11:27:19 +0200
commit089ba999dc881a7549d97c55ac9e0052d061867d (patch)
treee5278f9ecb3a7405545b940b9b64abeb2121b4cc /kernel
parentc517ee744b96e441d9c731e245f83c6d08dc0a19 (diff)
downloadop-kernel-dev-089ba999dc881a7549d97c55ac9e0052d061867d.zip
op-kernel-dev-089ba999dc881a7549d97c55ac9e0052d061867d.tar.gz
uprobes: Kill write_opcode()->lock_page(new_page)
write_opcode() does lock_page(new_page) for no reason. Nobody can see this page until __replace_page() exposes it under ptl lock, and we do nothing with this page after pte_unmap_unlock(). If nothing else, the similar code in do_wp_page() doesn't lock the new page for page_add_new_anon_rmap/set_pte_at_notify. 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/20120729182218.GA20315@redhat.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/events/uprobes.c2
1 files changed, 0 insertions, 2 deletions
diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c
index 6fda799..23c562b7 100644
--- a/kernel/events/uprobes.c
+++ b/kernel/events/uprobes.c
@@ -239,9 +239,7 @@ retry:
if (ret)
goto unlock_out;
- lock_page(new_page);
ret = __replace_page(vma, vaddr, old_page, new_page);
- unlock_page(new_page);
unlock_out:
unlock_page(old_page);
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