mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-27 14:43:58 +08:00
5fb94e9ca3
As we move stuff around, some doc references are broken. Fix some of them via this script: ./scripts/documentation-file-ref-check --fix Manually checked if the produced result is valid, removing a few false-positives. Acked-by: Takashi Iwai <tiwai@suse.de> Acked-by: Masami Hiramatsu <mhiramat@kernel.org> Acked-by: Stephen Boyd <sboyd@kernel.org> Acked-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com> Acked-by: Mathieu Poirier <mathieu.poirier@linaro.org> Reviewed-by: Coly Li <colyli@suse.de> Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org> Acked-by: Jonathan Corbet <corbet@lwn.net>
38 lines
1.1 KiB
C
38 lines
1.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
/*
|
|
* See Documentation/core-api/circular-buffers.rst for more information.
|
|
*/
|
|
|
|
#ifndef _LINUX_CIRC_BUF_H
|
|
#define _LINUX_CIRC_BUF_H 1
|
|
|
|
struct circ_buf {
|
|
char *buf;
|
|
int head;
|
|
int tail;
|
|
};
|
|
|
|
/* Return count in buffer. */
|
|
#define CIRC_CNT(head,tail,size) (((head) - (tail)) & ((size)-1))
|
|
|
|
/* Return space available, 0..size-1. We always leave one free char
|
|
as a completely full buffer has head == tail, which is the same as
|
|
empty. */
|
|
#define CIRC_SPACE(head,tail,size) CIRC_CNT((tail),((head)+1),(size))
|
|
|
|
/* Return count up to the end of the buffer. Carefully avoid
|
|
accessing head and tail more than once, so they can change
|
|
underneath us without returning inconsistent results. */
|
|
#define CIRC_CNT_TO_END(head,tail,size) \
|
|
({int end = (size) - (tail); \
|
|
int n = ((head) + end) & ((size)-1); \
|
|
n < end ? n : end;})
|
|
|
|
/* Return space available up to the end of the buffer. */
|
|
#define CIRC_SPACE_TO_END(head,tail,size) \
|
|
({int end = (size) - 1 - (head); \
|
|
int n = (end + (tail)) & ((size)-1); \
|
|
n <= end ? n : end+1;})
|
|
|
|
#endif /* _LINUX_CIRC_BUF_H */
|