mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-17 17:24:17 +08:00
784352fe0b
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de> Signed-off-by: David Sterba <dsterba@suse.com>
51 lines
1.0 KiB
C
51 lines
1.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
|
|
#ifndef BTRFS_MISC_H
|
|
#define BTRFS_MISC_H
|
|
|
|
#include <linux/sched.h>
|
|
#include <linux/wait.h>
|
|
#include <asm/div64.h>
|
|
|
|
#define in_range(b, first, len) ((b) >= (first) && (b) < (first) + (len))
|
|
|
|
static inline void cond_wake_up(struct wait_queue_head *wq)
|
|
{
|
|
/*
|
|
* This implies a full smp_mb barrier, see comments for
|
|
* waitqueue_active why.
|
|
*/
|
|
if (wq_has_sleeper(wq))
|
|
wake_up(wq);
|
|
}
|
|
|
|
static inline void cond_wake_up_nomb(struct wait_queue_head *wq)
|
|
{
|
|
/*
|
|
* Special case for conditional wakeup where the barrier required for
|
|
* waitqueue_active is implied by some of the preceding code. Eg. one
|
|
* of such atomic operations (atomic_dec_and_return, ...), or a
|
|
* unlock/lock sequence, etc.
|
|
*/
|
|
if (waitqueue_active(wq))
|
|
wake_up(wq);
|
|
}
|
|
|
|
static inline u64 div_factor(u64 num, int factor)
|
|
{
|
|
if (factor == 10)
|
|
return num;
|
|
num *= factor;
|
|
return div_u64(num, 10);
|
|
}
|
|
|
|
static inline u64 div_factor_fine(u64 num, int factor)
|
|
{
|
|
if (factor == 100)
|
|
return num;
|
|
num *= factor;
|
|
return div_u64(num, 100);
|
|
}
|
|
|
|
#endif
|