diff options
| author | Paul Mundt <lethal@linux-sh.org> | 2011-01-07 10:29:26 +0900 |
|---|---|---|
| committer | Paul Mundt <lethal@linux-sh.org> | 2011-01-07 10:29:26 +0900 |
| commit | 5e93c6b4ecd78b1bab49bad1dc2f6ed7ec0115ee (patch) | |
| tree | 4f4e321a1ca0baf64d8af528080c71f93495a7d7 /kernel/srcu.c | |
| parent | 98d27b8abf413a310df6676f7d2128ada1cccc08 (diff) | |
| parent | 3c0cb7c31c206aaedb967e44b98442bbeb17a6c4 (diff) | |
| download | lwn-5e93c6b4ecd78b1bab49bad1dc2f6ed7ec0115ee.tar.gz lwn-5e93c6b4ecd78b1bab49bad1dc2f6ed7ec0115ee.zip | |
Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/torvalds/linux-2.6 into rmobile-latest
Conflicts:
arch/arm/mach-shmobile/Kconfig
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
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); |