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authorIngo Molnar <mingo@kernel.org>2016-03-08 11:09:53 +0100
committerIngo Molnar <mingo@kernel.org>2016-03-08 11:09:53 +0100
commit6436257b491cc0d456c39330dfc22126148d5ed7 (patch)
tree4e3f4a1da9f88e429c95b7ea5661390fc611e836 /kernel
parent69365272332a5cbef778c97b2337b4f79c509293 (diff)
downloadlinux-6436257b491cc0d456c39330dfc22126148d5ed7.tar.bz2
time/timekeeping: Work around false positive GCC warning
Newer GCC versions trigger the following warning: kernel/time/timekeeping.c: In function ‘get_device_system_crosststamp’: kernel/time/timekeeping.c:987:5: warning: ‘clock_was_set_seq’ may be used uninitialized in this function [-Wmaybe-uninitialized] if (discontinuity) { ^ kernel/time/timekeeping.c:1045:15: note: ‘clock_was_set_seq’ was declared here unsigned int clock_was_set_seq; ^ GCC clearly is unable to recognize that the 'do_interp' boolean tracks the initialization status of 'clock_was_set_seq'. The GCC version used was: gcc version 5.3.1 20151207 (Red Hat 5.3.1-2) (GCC) Work it around by initializing clock_was_set_seq to 0. Compilers that are able to recognize the code flow will eliminate the unnecessary initialization. Acked-by: Thomas Gleixner <tglx@linutronix.de> Cc: John Stultz <john.stultz@linaro.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/time/timekeeping.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
index 931b0b1a71e9..9c629bbed572 100644
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -1042,7 +1042,7 @@ int get_device_system_crosststamp(int (*get_time_fn)
struct system_counterval_t system_counterval;
struct timekeeper *tk = &tk_core.timekeeper;
cycle_t cycles, now, interval_start;
- unsigned int clock_was_set_seq;
+ unsigned int clock_was_set_seq = 0;
ktime_t base_real, base_raw;
s64 nsec_real, nsec_raw;
u8 cs_was_changed_seq;