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Date: Wed, 17 Jul 2013 12:46:53 +0300 From: Baruch Siach <baruch@...s.co.il> To: John Stultz <john.stultz@...aro.org>, Thomas Gleixner <tglx@...utronix.de> Cc: linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, linux-xtensa@...ux-xtensa.org, Baruch Siach <baruch@...s.co.il> Subject: [PATCH] time: sched_clock: fix integer overflow The expression '(1 << 32)' happens to evaluate as 0 on ARM, but it evaluates as 1 on xtensa and x86_64. This zeros sched_clock_mask, and breaks sched_clock(). Set the type of 1 to 'unsigned long long' to get the value we need. Reported-by: Max Filippov <jcmvbkbc@...il.com> Tested-by: Max Filippov <jcmvbkbc@...il.com> Acked-by: Russell King <rmk+kernel@....linux.org.uk> Signed-off-by: Baruch Siach <baruch@...s.co.il> --- kernel/time/sched_clock.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/time/sched_clock.c b/kernel/time/sched_clock.c index a326f27..0b479a6 100644 --- a/kernel/time/sched_clock.c +++ b/kernel/time/sched_clock.c @@ -121,7 +121,7 @@ void __init setup_sched_clock(u32 (*read)(void), int bits, unsigned long rate) BUG_ON(bits > 32); WARN_ON(!irqs_disabled()); read_sched_clock = read; - sched_clock_mask = (1 << bits) - 1; + sched_clock_mask = (1ULL << bits) - 1; cd.rate = rate; /* calculate the mult/shift to convert counter ticks to ns. */ -- 1.8.3.2 -- 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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