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| author | Masami Hiramatsu <mhiramat@redhat.com> | 2010-03-03 22:38:50 -0500 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2010-03-04 11:39:21 +0100 |
| commit | e5a11016643d1ab7172193591506d33a844734cc (patch) | |
| tree | 45e9c865c1e25c19142cb395e98ef13dd6d6f145 | |
| parent | 32cb0dd50672056e510ccab442dc9c3a03be649e (diff) | |
| download | blackbird-obmc-linux-e5a11016643d1ab7172193591506d33a844734cc.tar.gz blackbird-obmc-linux-e5a11016643d1ab7172193591506d33a844734cc.zip | |
x86: Issue at least one memory barrier in stop_machine_text_poke()
Fix stop_machine_text_poke() to issue smp_mb() before exiting
waiting loop, and use cpu_relax() for waiting.
Changes in v2:
- Don't use ACCESS_ONCE().
Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com>
Acked-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: systemtap <systemtap@sources.redhat.com>
Cc: DLE <dle-develop@lists.sourceforge.net>
Cc: Jason Baron <jbaron@redhat.com>
LKML-Reference: <20100304033850.3819.74590.stgit@localhost6.localdomain6>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
| -rw-r--r-- | arch/x86/kernel/alternative.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/x86/kernel/alternative.c b/arch/x86/kernel/alternative.c index c41f13c15e8f..e0b877099470 100644 --- a/arch/x86/kernel/alternative.c +++ b/arch/x86/kernel/alternative.c @@ -595,8 +595,8 @@ static int __kprobes stop_machine_text_poke(void *data) wrote_text = 1; } else { while (!wrote_text) - smp_rmb(); - sync_core(); + cpu_relax(); + smp_mb(); /* Load wrote_text before following execution */ } flush_icache_range((unsigned long)tpp->addr, |
