/*
 * ratelimit.c - Do something with rate limit.
 *
 * Isolated from kernel/printk.c by Dave Young <hidave.darkstar@gmail.com>
 *
 * 2008-05-01 rewrite the function and use a ratelimit_state data struct as
 * parameter. Now every user can use their own standalone ratelimit_state.
 *
 * This file is released under the GPLv2.
 */

#include <linux/ratelimit.h>
#include <linux/jiffies.h>
#include <linux/export.h>

/*
 * __ratelimit - rate limiting
 * @rs: ratelimit_state data
 * @func: name of calling function
 *
 * This enforces a rate limit: not more than @rs->burst callbacks
 * in every @rs->interval
 *
 * RETURNS:
 * 0 means callbacks will be suppressed.
 * 1 means go ahead and do it.
 */
int ___ratelimit(struct ratelimit_state *rs, const char *func)
{
	unsigned long flags;
	int ret;

	if (!rs->interval)
		return 1;

	/*
	 * 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 (!raw_spin_trylock_irqsave(&rs->lock, flags))
		return 0;

	if (!rs->begin)
		rs->begin = jiffies;

	if (time_is_before_jiffies(rs->begin + rs->interval)) {
		if (rs->missed) {
			if (!(rs->flags & RATELIMIT_MSG_ON_RELEASE)) {
				pr_warn("%s: %d callbacks suppressed\n", func, rs->missed);
				rs->missed = 0;
			}
		}
		rs->begin   = jiffies;
		rs->printed = 0;
	}
	if (rs->burst && rs->burst > rs->printed) {
		rs->printed++;
		ret = 1;
	} else {
		rs->missed++;
		ret = 0;
	}
	raw_spin_unlock_irqrestore(&rs->lock, flags);

	return ret;
}
EXPORT_SYMBOL(___ratelimit);
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<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/commit/?id=1f3a8e49d8f28f498b8694464623ac20aebfe62a'>root</a>/<a href='/cgit.cgi/linux/net-next.git/commit/net?id=1f3a8e49d8f28f498b8694464623ac20aebfe62a'>net</a>/<a href='/cgit.cgi/linux/net-next.git/commit/net/sctp?id=1f3a8e49d8f28f498b8694464623ac20aebfe62a'>sctp</a>/<a href='/cgit.cgi/linux/net-next.git/commit/net/sctp/Makefile?id=1f3a8e49d8f28f498b8694464623ac20aebfe62a'>Makefile</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='id' value='1f3a8e49d8f28f498b8694464623ac20aebfe62a'/><table><tr><td colspan='2'/></tr><tr><td class='label'>context:</td><td class='ctrl'><select name='context' onchange='this.form.submit();'><option value='1'>1</option><option value='2'>2</option><option value='3' selected='selected'>3</option><option value='4'>4</option><option value='5'>5</option><option value='6'>6</option><option value='7'>7</option><option value='8'>8</option><option value='9'>9</option><option value='10'>10</option><option value='15'>15</option><option value='20'>20</option><option value='25'>25</option><option value='30'>30</option><option value='35'>35</option><option value='40'>40</option></select></td></tr><tr><td class='label'>space:</td><td class='ctrl'><select name='ignorews' onchange='this.form.submit();'><option value='0' selected='selected'>include</option><option value='1'>ignore</option></select></td></tr><tr><td class='label'>mode:</td><td class='ctrl'><select name='dt' onchange='this.form.submit();'><option value='0' selected='selected'>unified</option><option value='1'>ssdiff</option><option value='2'>stat only</option></select></td></tr><tr><td/><td class='ctrl'><noscript><input type='submit' value='reload'/></noscript></td></tr></table></form></div><table summary='commit info' class='commit-info'>
<tr><th>author</th><td>Thomas Gleixner &lt;tglx@linutronix.de&gt;</td><td class='right'>2016-12-25 12:43:07 +0100</td></tr>
<tr><th>committer</th><td>Thomas Gleixner &lt;tglx@linutronix.de&gt;</td><td class='right'>2016-12-25 17:21:23 +0100</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/net/sctp/Makefile?id=1f3a8e49d8f28f498b8694464623ac20aebfe62a'>1f3a8e49d8f28f498b8694464623ac20aebfe62a</a> (<a href='/cgit.cgi/linux/net-next.git/patch/net/sctp/Makefile?id=1f3a8e49d8f28f498b8694464623ac20aebfe62a'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=1f3a8e49d8f28f498b8694464623ac20aebfe62a'>da0b5101c3be3e18b55b0a11974f63a3195704f9</a> /<a href='/cgit.cgi/linux/net-next.git/tree/net/sctp/Makefile?id=1f3a8e49d8f28f498b8694464623ac20aebfe62a'>net/sctp/Makefile</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/net/sctp/Makefile?id=8b0e195314fabd58a331c4f7b6db75a1565535d7'>8b0e195314fabd58a331c4f7b6db75a1565535d7</a> (<a href='/cgit.cgi/linux/net-next.git/diff/net/sctp/Makefile?id=1f3a8e49d8f28f498b8694464623ac20aebfe62a&amp;id2=8b0e195314fabd58a331c4f7b6db75a1565535d7'>diff</a>)</td></tr></table>
<div class='commit-subject'>ktime: Get rid of ktime_equal()</div><div class='commit-msg'>No point in going through loops and hoops instead of just comparing the
values.

Signed-off-by: Thomas Gleixner &lt;tglx@linutronix.de&gt;
Cc: Peter Zijlstra &lt;peterz@infradead.org&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=1f3a8e49d8f28f498b8694464623ac20aebfe62a'>Diffstat</a> (limited to 'net/sctp/Makefile')</div><table summary='diffstat' class='diffstat'>