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Date: Fri, 26 Dec 2008 21:05:06 -0800 From: Yinghai Lu <yinghai@...nel.org> To: Sam Ravnborg <sam@...nborg.org>, David Howells <dhowells@...hat.com>, mingo@...e.hu CC: Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>, Andrew Morton <akpm@...ux-foundation.org>, Stephen Rothwell <sfr@...b.auug.org.au>, linux-next@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>, mel@....ul.ie Subject: [PATCH] perf_counter: more barrier in blank weak function Impact: fix panic possible panic etc some compiler seems to inline the weak global function if no line in it Signed-off-by: Yinghai Lu <yinghai@...nel.org> diff --git a/kernel/perf_counter.c b/kernel/perf_counter.c index d7a79f3..37f7716 100644 --- a/kernel/perf_counter.c +++ b/kernel/perf_counter.c @@ -45,8 +45,8 @@ hw_perf_counter_init(struct perf_counter *counter) } u64 __weak hw_perf_save_disable(void) { return 0; } -void __weak hw_perf_restore(u64 ctrl) { } -void __weak hw_perf_counter_setup(void) { } +void __weak hw_perf_restore(u64 ctrl) { barrier(); } +void __weak hw_perf_counter_setup(void) { barrier(); } static void list_add_counter(struct perf_counter *counter, struct perf_counter_context *ctx) -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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