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| author | Ingo Molnar <mingo@elte.hu> | 2010-12-23 12:57:04 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2010-12-23 12:57:04 +0100 |
| commit | 394f4528c523d88daabd50f883a8d6b164075555 (patch) | |
| tree | b45a5b87a1ba9be8afe71f1db1537ff19e2b05d8 /kernel/srcu.c | |
| parent | 90a8a73c06cc32b609a880d48449d7083327e11a (diff) | |
| parent | 3c2dcf2aed5ea22ecf65a9a871c4963faec421b3 (diff) | |
Merge branch 'rcu/next' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-2.6-rcu into core/rcu
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 c71e0750053..98d8c1e80ed 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); |