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BACKPORT: clocksource: Use GENMASK_ULL in definition of CLOCKSOURCE_MASK

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Besides reusing existing code this removes the special case handling
for 64-bit masks, which causes clang to raise a shift count overflow
warning due to https://bugs.llvm.org//show_bug.cgi?id=10030.

Suggested-by: Dmitry Torokhov <dtor@chromium.org>
Signed-off-by: Matthias Kaehlcke <mka@chromium.org>
Cc: Grant Grundler <grundler@chromium.org>
Cc: Greg Hackmann <ghackmann@google.com>
Cc: Michael Davidson <md@google.com>
Cc: John Stultz <john.stultz@linaro.org>
Link: http://lkml.kernel.org/r/20170418233037.70990-1-mka@chromium.org
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
(cherry picked from commit 0773cea374)
[astrachan: minor re-diff; (cycle_t) vs (u64) cast]
Bug: 78886293
Change-Id: I97df9621cc65bba74a5086c2c35c2224b559a156
Signed-off-by: Alistair Strachan <astrachan@google.com>
This commit is contained in:
Matthias Kaehlcke
2017-04-18 16:30:37 -07:00
committed by Alistair Strachan
parent ea5ec6ca85
commit 1201ddda31
1 changed files with 1 additions and 1 deletions
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2
include/linux/clocksource.h
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@@ -117,7 +117,7 @@ struct clocksource {
#define CLOCK_SOURCE_RESELECT 0x100
/* simplify initialization of mask field */
#define CLOCKSOURCE_MASK(bits) (cycle_t)((bits) < 64 ? ((1ULL<<(bits))-1) : -1)
#define CLOCKSOURCE_MASK(bits) GENMASK_ULL((bits) - 1, 0)
static inline u32 clocksource_freq2mult(u32 freq, u32 shift_constant, u64 from)
{