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| author | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2020-02-01 04:42:33 +0300 |
|---|---|---|
| committer | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2020-02-01 04:42:33 +0300 |
| commit | b19efcabb587e5470a423ef778905f47e5a47f1a (patch) | |
| tree | 8863c2233ed8a30d55c4e4029a98c3d7faf359a8 /lib/dump_stack.c | |
| parent | 996d5d5f89a558a3608a46e73ccd1b99f1b1d058 (diff) | |
| parent | c5ccf2ad3d33413fee06ae87d0b970d8cc540db6 (diff) | |
| download | linux-b19efcabb587e5470a423ef778905f47e5a47f1a.tar.xz | |
Merge branch 'next' into for-linus
Prepare input updates for 5.6 merge window.
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; } |