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| author | Jonathan Corbet <corbet@lwn.net> | 2010-09-08 16:54:54 -0600 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2010-09-09 09:09:43 -0700 |
| commit | a73f8844e1fc54c3762555c1cf1f71774142ca91 (patch) | |
| tree | 6cf860dead41a30f5fac677f0cd478efad564c8f /include/linux | |
| parent | 39aa3cb3e8250db9188a6f1e3fb62ffa1a717678 (diff) | |
| download | linux-a73f8844e1fc54c3762555c1cf1f71774142ca91.tar.gz linux-a73f8844e1fc54c3762555c1cf1f71774142ca91.tar.bz2 linux-a73f8844e1fc54c3762555c1cf1f71774142ca91.zip | |
lglock: make lg_lock_global() actually lock globally
lg_lock_global() currently only acquires spinlocks for online CPUs, but
it's meant to lock all possible CPUs. Lglock-protected resources may be
associated with removed CPUs - and, indeed, that could happen with the
per-superblock open files lists.
At Nick's suggestion, change for_each_online_cpu() to
for_each_possible_cpu() to protect accesses to those resources.
Cc: Al Viro <viro@ZenIV.linux.org.uk>
Acked-by: Nick Piggin <npiggin@kernel.dk>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/lglock.h | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/include/linux/lglock.h b/include/linux/lglock.h index b288cb713b90..f549056fb20b 100644 --- a/include/linux/lglock.h +++ b/include/linux/lglock.h @@ -150,7 +150,7 @@ int i; \ preempt_disable(); \ rwlock_acquire(&name##_lock_dep_map, 0, 0, _RET_IP_); \ - for_each_online_cpu(i) { \ + for_each_possible_cpu(i) { \ arch_spinlock_t *lock; \ lock = &per_cpu(name##_lock, i); \ arch_spin_lock(lock); \ @@ -161,7 +161,7 @@ void name##_global_unlock(void) { \ int i; \ rwlock_release(&name##_lock_dep_map, 1, _RET_IP_); \ - for_each_online_cpu(i) { \ + for_each_possible_cpu(i) { \ arch_spinlock_t *lock; \ lock = &per_cpu(name##_lock, i); \ arch_spin_unlock(lock); \ |