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| author | Al Viro <viro@zeniv.linux.org.uk> | 2016-05-17 02:17:59 -0400 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2016-05-17 02:17:59 -0400 |
| commit | 0e0162bb8c008fa7742f69d4d4982c8a37b88f95 (patch) | |
| tree | 4b230ab63b5698a44d2948e70a6cc22405c351e9 /drivers/perf/arm_pmu.c | |
| parent | ae05327a00fd47c34dfe25294b359a3f3fef96e8 (diff) | |
| parent | 38b78a5f18584db6fa7441e0f4531b283b0e6725 (diff) | |
| download | linux-0e0162bb8c008fa7742f69d4d4982c8a37b88f95.tar.bz2 | |
Merge branch 'ovl-fixes' into for-linus
Backmerge to resolve a conflict in ovl_lookup_real();
"ovl_lookup_real(): use lookup_one_len_unlocked()" instead,
but it was too late in the cycle to rebase.
Diffstat (limited to 'drivers/perf/arm_pmu.c')
| -rw-r--r-- | drivers/perf/arm_pmu.c | 15 |
1 files changed, 13 insertions, 2 deletions
diff --git a/drivers/perf/arm_pmu.c b/drivers/perf/arm_pmu.c index 32346b5a8a11..f70090897fdf 100644 --- a/drivers/perf/arm_pmu.c +++ b/drivers/perf/arm_pmu.c @@ -737,8 +737,19 @@ static void cpu_pm_pmu_setup(struct arm_pmu *armpmu, unsigned long cmd) break; case CPU_PM_EXIT: case CPU_PM_ENTER_FAILED: - /* Restore and enable the counter */ - armpmu_start(event, PERF_EF_RELOAD); + /* + * Restore and enable the counter. + * armpmu_start() indirectly calls + * + * perf_event_update_userpage() + * + * that requires RCU read locking to be functional, + * wrap the call within RCU_NONIDLE to make the + * RCU subsystem aware this cpu is not idle from + * an RCU perspective for the armpmu_start() call + * duration. + */ + RCU_NONIDLE(armpmu_start(event, PERF_EF_RELOAD)); break; default: break; |