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llist: make llist_add_batch() a static inline

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The function is small enough that it should be, and it's a (very) hot path
for io_uring.  Doing this actually reduces my vmlinux text size for my
standard build/test box.

Before:
axboe@r7625 ~/g/linux (test)> size vmlinux
   text	   data	    bss	    dec	    hex		filename
19892174 5938310 2470432 28300916 1afd674	vmlinux

After:
axboe@r7625 ~/g/linux (test)> size vmlinux
   text	   data	    bss	    dec	    hex		filename
19891878 5938310 2470436 28300624 1afd550	vmlinux

Link: https://lkml.kernel.org/r/f1d104c6-7ac8-457a-a53d-6bb741421b2f@kernel.dk
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Jens Axboe 2025-05-23 13:13:11 -06:00 committed by Andrew Morton
parent 5ef2dccfcc
commit 375700bab5
2 changed files with 20 additions and 25 deletions
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23
include/linux/llist.h
View File

@ -223,9 +223,26 @@ static inline struct llist_node *llist_next(struct llist_node *node)
return node->next;
}
extern bool llist_add_batch(struct llist_node *new_first,
struct llist_node *new_last,
struct llist_head *head);
/**
* llist_add_batch - add several linked entries in batch
* @new_first: first entry in batch to be added
* @new_last: last entry in batch to be added
* @head: the head for your lock-less list
*
* Return whether list is empty before adding.
*/
static inline bool llist_add_batch(struct llist_node *new_first,
struct llist_node *new_last,
struct llist_head *head)
{
struct llist_node *first = READ_ONCE(head->first);
do {
new_last->next = first;
} while (!try_cmpxchg(&head->first, &first, new_first));
return !first;
}
static inline bool __llist_add_batch(struct llist_node *new_first,
struct llist_node *new_last,

22
lib/llist.c
View File

@ -14,28 +14,6 @@
#include <linux/export.h>
#include <linux/llist.h>
/**
* llist_add_batch - add several linked entries in batch
* @new_first: first entry in batch to be added
* @new_last: last entry in batch to be added
* @head: the head for your lock-less list
*
* Return whether list is empty before adding.
*/
bool llist_add_batch(struct llist_node *new_first, struct llist_node *new_last,
struct llist_head *head)
{
struct llist_node *first = READ_ONCE(head->first);
do {
new_last->next = first;
} while (!try_cmpxchg(&head->first, &first, new_first));
return !first;
}
EXPORT_SYMBOL_GPL(llist_add_batch);
/**
* llist_del_first - delete the first entry of lock-less list
* @head: the head for your lock-less list