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| author | Arnd Bergmann <arnd@arndb.de> | 2018-04-09 14:23:33 +0200 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2018-04-10 09:18:04 +0200 |
| commit | bbe9a70a478129f3f9b2003415d0c36afcea210f (patch) | |
| tree | e69c1d48fbe29e0e7d1d11270966e78f75b177c3 /kernel/time | |
| parent | cpuidle: Add definition of residency to sysfs documentation (diff) | |
| download | linux-bbe9a70a478129f3f9b2003415d0c36afcea210f.tar.xz linux-bbe9a70a478129f3f9b2003415d0c36afcea210f.zip | |
tick-sched: avoid a maybe-uninitialized warning
The use of bitfields seems to confuse gcc, leading to a false-positive
warning in all compiler versions:
kernel/time/tick-sched.c: In function 'tick_nohz_idle_exit':
kernel/time/tick-sched.c:538:2: error: 'now' may be used uninitialized in this function [-Werror=maybe-uninitialized]
This introduces a temporary variable to track the flags so gcc
doesn't have to evaluate twice, eliminating the code path that
leads to the warning.
Link: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85301
Fixes: 1cae544d42d2 ("nohz: Gather tick_sched booleans under a common flag field")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'kernel/time')
| -rw-r--r-- | kernel/time/tick-sched.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c index 956831cf6cfb..e35a6fced00c 100644 --- a/kernel/time/tick-sched.c +++ b/kernel/time/tick-sched.c @@ -1134,6 +1134,7 @@ void tick_nohz_idle_restart_tick(void) void tick_nohz_idle_exit(void) { struct tick_sched *ts = this_cpu_ptr(&tick_cpu_sched); + bool idle_active, tick_stopped; ktime_t now; local_irq_disable(); @@ -1142,14 +1143,16 @@ void tick_nohz_idle_exit(void) WARN_ON_ONCE(ts->timer_expires_base); ts->inidle = 0; + idle_active = ts->idle_active; + tick_stopped = ts->tick_stopped; - if (ts->idle_active || ts->tick_stopped) + if (idle_active || tick_stopped) now = ktime_get(); - if (ts->idle_active) + if (idle_active) tick_nohz_stop_idle(ts, now); - if (ts->tick_stopped) + if (tick_stopped) __tick_nohz_idle_restart_tick(ts, now); local_irq_enable(); |