diff options
| author | Paul E. McKenney <[email protected]> | 2009-09-08 15:54:36 -0700 |
|---|---|---|
| committer | Ingo Molnar <[email protected]> | 2009-09-18 00:04:54 +0200 |
| commit | de078d875cc7fc709f7818f26d38389c04369826 (patch) | |
| tree | 0e7ed4d9d11ae707cc3b4e1e9d511a6d78e9e29d /lib/cpu-notifier-error-inject.c | |
| parent | de55a8958f6e3ef5ce5f0971b80bd44bfcac7cf1 (diff) | |
rcu: Need to update rnp->gpnum if preemptable RCU is to be reliable
Without this patch, tasks preempted in RCU read-side critical
sections can fail to block the grace period, given that
rnp->gpnum is used to determine which rnp->blocked_tasks[]
element the preempted task is enqueued on.
Before the patch, rnp->gpnum is always zero, so preempted tasks
are always enqueued on rnp->blocked_tasks[0], which is correct
only when the current CPU has not checked into the current
grace period and the grace-period number is even, or,
similarly, if the current CPU -has- checked into the current
grace period and the grace-period number is odd.
Signed-off-by: Paul E. McKenney <[email protected]>
Acked-by: Steven Rostedt <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
LKML-Reference: <12524504771622-git-send-email->
Signed-off-by: Ingo Molnar <[email protected]>
Diffstat (limited to 'lib/cpu-notifier-error-inject.c')
0 files changed, 0 insertions, 0 deletions