diff options
| author |   Nicholas Bellinger <nab@linux-iscsi.org> | 2011-01-16 21:21:04 +0000 |
|---|---|---|
| committer | Nicholas Bellinger <nab@linux-iscsi.org> | 2011-01-16 21:21:04 +0000 |
| commit | f652f6c5b7cfdf139f4155d78f397e99ae1c4acc (patch) | |
| tree | 71c6344688bf56ea6aaf18c586ab69ff4f077ade /kernel/srcu.c | |
| parent | [SCSI] sd,sr: kill compat SDEV_MEDIA_CHANGE event (diff) | |
| parent | [SCSI] target: Add LIO target core v4.0.0-rc6 (diff) | |
Merge branch 'master' of /pub/scm/linux/kernel/git/jejb/scsi-post-merge-2.6 into for-linus
Diffstat (limited to 'kernel/srcu.c')
| -rw-r--r-- | kernel/srcu.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/kernel/srcu.c b/kernel/srcu.c index c71e07500536..98d8c1e80edb 100644 --- a/kernel/srcu.c +++ b/kernel/srcu.c @@ -31,6 +31,7 @@ #include <linux/rcupdate.h> #include <linux/sched.h> #include <linux/smp.h> +#include <linux/delay.h> #include <linux/srcu.h> static int init_srcu_struct_fields(struct srcu_struct *sp) @@ -203,9 +204,14 @@ static void __synchronize_srcu(struct srcu_struct *sp, void (*sync_func)(void)) * all srcu_read_lock() calls using the old counters have completed. * Their corresponding critical sections might well be still * executing, but the srcu_read_lock() primitives themselves - * will have finished executing. + * will have finished executing. We initially give readers + * an arbitrarily chosen 10 microseconds to get out of their + * SRCU read-side critical sections, then loop waiting 1/HZ + * seconds per iteration. */ + if (srcu_readers_active_idx(sp, idx)) + udelay(CONFIG_SRCU_SYNCHRONIZE_DELAY); while (srcu_readers_active_idx(sp, idx)) schedule_timeout_interruptible(1); |