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authorLinus Torvalds <torvalds@linux-foundation.org>2009-12-05 09:50:22 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2009-12-05 09:50:22 -0800
commitd0b093a8b5ae34ee8be1f7e0dd197fe4788fa1d5 (patch)
treedeaed4192d440b6afb7470b0c36e69d9d65dd119 /lib
parent3e72b810e30cdf4655279dd767eb798ac7a8fe5e (diff)
parent5c828713358cb9df8aa174371edcbbb62203a490 (diff)
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Merge branch 'core-printk-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
* 'core-printk-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: ratelimit: Make suppressed output messages more useful printk: Remove ratelimit.h from kernel.h ratelimit: Fix/allow use in atomic contexts ratelimit: Use per ratelimit context locking
Diffstat (limited to 'lib')
-rw-r--r--lib/ratelimit.c45
1 files changed, 25 insertions, 20 deletions
diff --git a/lib/ratelimit.c b/lib/ratelimit.c
index 26187edcc7e..09f5ce1810d 100644
--- a/lib/ratelimit.c
+++ b/lib/ratelimit.c
@@ -7,15 +7,12 @@
* parameter. Now every user can use their own standalone ratelimit_state.
*
* This file is released under the GPLv2.
- *
*/
-#include <linux/kernel.h>
+#include <linux/ratelimit.h>
#include <linux/jiffies.h>
#include <linux/module.h>
-static DEFINE_SPINLOCK(ratelimit_lock);
-
/*
* __ratelimit - rate limiting
* @rs: ratelimit_state data
@@ -23,35 +20,43 @@ static DEFINE_SPINLOCK(ratelimit_lock);
* This enforces a rate limit: not more than @rs->ratelimit_burst callbacks
* in every @rs->ratelimit_jiffies
*/
-int __ratelimit(struct ratelimit_state *rs)
+int ___ratelimit(struct ratelimit_state *rs, const char *func)
{
unsigned long flags;
+ int ret;
if (!rs->interval)
return 1;
- spin_lock_irqsave(&ratelimit_lock, flags);
+ /*
+ * If we contend on this state's lock then almost
+ * by definition we are too busy to print a message,
+ * in addition to the one that will be printed by
+ * the entity that is holding the lock already:
+ */
+ if (!spin_trylock_irqsave(&rs->lock, flags))
+ return 1;
+
if (!rs->begin)
rs->begin = jiffies;
if (time_is_before_jiffies(rs->begin + rs->interval)) {
if (rs->missed)
printk(KERN_WARNING "%s: %d callbacks suppressed\n",
- __func__, rs->missed);
- rs->begin = 0;
+ func, rs->missed);
+ rs->begin = 0;
rs->printed = 0;
- rs->missed = 0;
+ rs->missed = 0;
}
- if (rs->burst && rs->burst > rs->printed)
- goto print;
-
- rs->missed++;
- spin_unlock_irqrestore(&ratelimit_lock, flags);
- return 0;
+ if (rs->burst && rs->burst > rs->printed) {
+ rs->printed++;
+ ret = 1;
+ } else {
+ rs->missed++;
+ ret = 0;
+ }
+ spin_unlock_irqrestore(&rs->lock, flags);
-print:
- rs->printed++;
- spin_unlock_irqrestore(&ratelimit_lock, flags);
- return 1;
+ return ret;
}
-EXPORT_SYMBOL(__ratelimit);
+EXPORT_SYMBOL(___ratelimit);