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clocksource: Use GENMASK_ULL in definition of CLOCKSOURCE_MASK 

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>
This commit is contained in:
Matthias Kaehlcke 2017-04-18 16:30:37 -07:00 committed by Thomas Gleixner
parent 26e42a0204
commit 0773cea374
1 changed files with 1 additions and 1 deletions
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include/linux/clocksource.h
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@ -120,7 +120,7 @@ struct clocksource {
#define CLOCK_SOURCE_RESELECT 0x100 #define CLOCK_SOURCE_RESELECT 0x100
/* simplify initialization of mask field */ /* simplify initialization of mask field */
#define CLOCKSOURCE_MASK(bits) (u64)((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) static inline u32 clocksource_freq2mult(u32 freq, u32 shift_constant, u64 from)
{ {