Revision 2f53d15cf95824ed320abed3c33759b8b21aca15 authored by Xianting Tian on 30 June 2021, 14:33:36 UTC, committed by Damien Le Moal on 16 July 2021, 04:45:18 UTC
bio_alloc() with __GFP_DIRECT_RECLAIM, which is included in GFP_NOFS, never fails, see comments in bio_alloc_bioset(). Signed-off-by: Xianting Tian <xianting.tian@linux.alibaba.com> Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
1 parent e73f0f0
ratelimit.c
// SPDX-License-Identifier: GPL-2.0-only
/*
* 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.
*/
#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)) {
printk_deferred(KERN_WARNING
"%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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