| commit | cf246087a19a4958fba3123d21f1359b6177ddb5 | |
| author | Gleb Natapov <gleb@redhat.com> | |
| Tue, 18 Oct 2011 17:55:51 +0000 (18 19:55 +0200) | ||
| committer | Greg Kroah-Hartman <gregkh@suse.de> | |
| Fri, 9 Dec 2011 16:55:54 +0000 (9 08:55 -0800) | ||
| tree | 9d857d9ddf07d826bb2718ceff8b80dfb210bb4e | treesnapshot (tar.gz zip) |
| parent | 6bdf07f3dd1c2874792bb07cd84d4210cbc15ca7 | commitdiff |
jump_label: jump_label_inc may return before the code is patched
commit bbbf7af4bf8fc69bc751818cf30521080fa47dcb upstream.
If cpu A calls jump_label_inc() just after atomic_add_return() is
called by cpu B, atomic_inc_not_zero() will return value greater then
zero and jump_label_inc() will return to a caller before jump_label_update()
finishes its job on cpu B.
Link: http://lkml.kernel.org/r/20111018175551.GH17571@redhat.com
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Acked-by: Jason Baron <jbaron@redhat.com>
Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
commit bbbf7af4bf8fc69bc751818cf30521080fa47dcb upstream.
If cpu A calls jump_label_inc() just after atomic_add_return() is
called by cpu B, atomic_inc_not_zero() will return value greater then
zero and jump_label_inc() will return to a caller before jump_label_update()
finishes its job on cpu B.
Link: http://lkml.kernel.org/r/20111018175551.GH17571@redhat.com
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Acked-by: Jason Baron <jbaron@redhat.com>
Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| kernel/jump_label.c | diffblobblamehistory |