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Groups > linux.kernel > #1625725

[PATCH v2] 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>
---
Changes in v2:
- Remove unnecessary cast to u64

 include/linux/clocksource.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/clocksource.h b/include/linux/clocksource.h
index cfc75848a35d..f2b10d9ebd04 100644
--- a/include/linux/clocksource.h
+++ b/include/linux/clocksource.h
@@ -120,7 +120,7 @@ struct clocksource {
 #define CLOCK_SOURCE_RESELECT			0x100
 
 /* 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)
 {
-- 
2.12.2.816.g2cccc81164-goog

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[PATCH v2] clocksource: Use GENMASK_ULL in definition of CLOCKSOURCE_MASK Matthias Kaehlcke <mka@chromium.org> - 2017-04-19 01:40 +0200
  [tip:timers/core] clocksource: Use GENMASK_ULL in definition of  CLOCKSOURCE_MASK tip-bot for Matthias Kaehlcke <tipbot@zytor.com> - 2017-04-20 15:20 +0200

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