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| author | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2020-01-11 01:56:04 +0300 |
|---|---|---|
| committer | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2020-01-11 01:56:04 +0300 |
| commit | 1bdd3e05a0a3b4a97ea88bc46fef8fb265c8b94c (patch) | |
| tree | 2244894a9ea0c941a8f32e5f3d196b4ea0eae24b /lib/dump_stack.c | |
| parent | 643dd7416649bea2e8c61d8fdeeefb409a0ca5eb (diff) | |
| parent | c79f46a282390e0f5b306007bf7b11a46d529538 (diff) | |
| download | linux-1bdd3e05a0a3b4a97ea88bc46fef8fb265c8b94c.tar.xz | |
Merge tag 'v5.5-rc5' into next
Sync up with mainline to get SPI "delay" API changes.
Diffstat (limited to 'lib/dump_stack.c')
| -rw-r--r-- | lib/dump_stack.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/lib/dump_stack.c b/lib/dump_stack.c index 5cff72f18c4a..33ffbf308853 100644 --- a/lib/dump_stack.c +++ b/lib/dump_stack.c @@ -106,7 +106,12 @@ retry: was_locked = 1; } else { local_irq_restore(flags); - cpu_relax(); + /* + * Wait for the lock to release before jumping to + * atomic_cmpxchg() in order to mitigate the thundering herd + * problem. + */ + do { cpu_relax(); } while (atomic_read(&dump_lock) != -1); goto retry; } |