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| author | Sebastian Andrzej Siewior <bigeasy@linutronix.de> | 2019-09-04 16:55:27 +0200 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2019-09-05 10:39:06 +0200 |
| commit | 5d2295f3a93b04986d069ebeaf5b07725f9096c1 (patch) | |
| tree | 64e4e240fad905210d6b135c1e73f9bde753721d /kernel/time | |
| parent | posix-cpu-timers: Make expiry_active check actually work correctly (diff) | |
| download | linux-5d2295f3a93b04986d069ebeaf5b07725f9096c1.tar.xz linux-5d2295f3a93b04986d069ebeaf5b07725f9096c1.zip | |
hrtimer: Add a missing bracket and hide `migration_base' on !SMP
The recent change to avoid taking the expiry lock when a timer is currently
migrated missed to add a bracket at the end of the if statement leading to
compile errors. Since that commit the variable `migration_base' is always
used but it is only available on SMP configuration thus leading to another
compile error. The changelog says "The timer base and base->cpu_base
cannot be NULL in the code path", so it is safe to limit this check to SMP
configurations only.
Add the missing bracket to the if statement and hide `migration_base'
behind CONFIG_SMP bars.
[ tglx: Mark the functions inline ... ]
Fixes: 68b2c8c1e4210 ("hrtimer: Don't take expiry_lock when timer is currently migrated")
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/20190904145527.eah7z56ntwobqm6j@linutronix.de
Diffstat (limited to 'kernel/time')
| -rw-r--r-- | kernel/time/hrtimer.c | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/kernel/time/hrtimer.c b/kernel/time/hrtimer.c index ebbd0fb3512b..0d4dc241c0fb 100644 --- a/kernel/time/hrtimer.c +++ b/kernel/time/hrtimer.c @@ -140,6 +140,11 @@ static struct hrtimer_cpu_base migration_cpu_base = { #define migration_base migration_cpu_base.clock_base[0] +static inline bool is_migration_base(struct hrtimer_clock_base *base) +{ + return base == &migration_base; +} + /* * We are using hashed locking: holding per_cpu(hrtimer_bases)[n].lock * means that all timers which are tied to this base via timer->base are @@ -264,6 +269,11 @@ again: #else /* CONFIG_SMP */ +static inline bool is_migration_base(struct hrtimer_clock_base *base) +{ + return false; +} + static inline struct hrtimer_clock_base * lock_hrtimer_base(const struct hrtimer *timer, unsigned long *flags) { @@ -1221,7 +1231,7 @@ void hrtimer_cancel_wait_running(const struct hrtimer *timer) * Just relax if the timer expires in hard interrupt context or if * it is currently on the migration base. */ - if (!timer->is_soft || base == &migration_base) + if (!timer->is_soft || is_migration_base(base)) { cpu_relax(); return; } |