From: Matthias Kaehlcke <mka@chromium.org>
To: John Stultz <john.stultz@linaro.org>,
Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org, Dmitry Torokhov <dtor@chromium.org>,
Grant Grundler <grundler@chromium.org>,
Greg Hackmann <ghackmann@google.com>,
Michael Davidson <md@google.com>,
Matthias Kaehlcke <mka@chromium.org>
Subject: [PATCH v2] clocksource: Use GENMASK_ULL in definition of CLOCKSOURCE_MASK
Date: Mon, 17 Apr 2017 10:38:59 -0700 [thread overview]
Message-ID: <20170417173900.27425-1-mka@chromium.org> (raw)
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)
{
--
2.12.2.762.g0e3151a226-goog
next reply other threads:[~2017-04-17 17:39 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-04-17 17:38 Matthias Kaehlcke [this message]
2017-04-18 8:13 ` Thomas Gleixner
2017-04-18 23:30 Matthias Kaehlcke
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