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| author | Jani Nikula <jani.nikula@intel.com> | 2019-11-15 13:17:39 +0200 |
|---|---|---|
| committer | Jani Nikula <jani.nikula@intel.com> | 2019-11-15 13:17:39 +0200 |
| commit | e205ceeb253723f4e4bdce619844ed678ae48276 (patch) | |
| tree | b6f5e3b21f915320a86733504faf8206569b8057 /lib/dump_stack.c | |
| parent | 1cdc2330e8d396c9cbebfc75fba4c94d34f80782 (diff) | |
| parent | 17cc51390c141662748dbbc2fe98f3ed10f2e13e (diff) | |
| download | lwn-e205ceeb253723f4e4bdce619844ed678ae48276.tar.gz lwn-e205ceeb253723f4e4bdce619844ed678ae48276.zip | |
Merge drm/drm-next into drm-intel-next-queued
Backmerge to get dfce90259d74 ("Backmerge i915 security patches from
commit 'ea0b163b13ff' into drm-next") and thus 100d46bd72ec ("Merge
Intel Gen8/Gen9 graphics fixes from Jon Bloomfield.").
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
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; } |