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| author |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-11-11 06:23:37 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-11-11 06:23:37 +0100 |
| commit | f0cb9b5dfd1a6014349354e63768500a860cad53 (patch) | |
| tree | b18478292c622b7cfbc4f49dc52e1f3816ac1b99 /lib/dump_stack.c | |
| parent | staging: vchiq: Have vchiu_queue_init() return 0 on success. (diff) | |
| parent | Linux 5.4-rc7 (diff) | |
| download | linux-dev-f0cb9b5dfd1a6014349354e63768500a860cad53.tar.xz linux-dev-f0cb9b5dfd1a6014349354e63768500a860cad53.zip | |
Merge 5.4-rc7 into staging-next
We want the staging fixes in here, and it resolves some merge issues.
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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; } |