The patch titled
fs/locks.c: remove init_once()
has been added to the -mm tree. Its filename is
fs-locksc-remove-init_once.patch
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The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: fs/locks.c: remove init_once()
From: Miklos Szeredi <mszeredi@xxxxxxx>
Remove SLAB initialization entirely, as suggested by Bruce and Linus.
Allocate with __GFP_ZERO instead and only initialize list heads.
Signed-off-by: Miklos Szeredi <mszeredi@xxxxxxx>
Cc: J. Bruce Fields <bfields@xxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/locks.c | 41 ++++++++++-------------------------------
1 file changed, 10 insertions(+), 31 deletions(-)
diff -puN fs/locks.c~fs-locksc-remove-init_once fs/locks.c
--- a/fs/locks.c~fs-locksc-remove-init_once
+++ a/fs/locks.c
@@ -160,26 +160,20 @@ EXPORT_SYMBOL_GPL(unlock_flocks);
static struct kmem_cache *filelock_cache __read_mostly;
-static void locks_init_lock_always(struct file_lock *fl)
+static void locks_init_lock_heads(struct file_lock *fl)
{
- fl->fl_next = NULL;
- fl->fl_fasync = NULL;
- fl->fl_owner = NULL;
- fl->fl_pid = 0;
- fl->fl_nspid = NULL;
- fl->fl_file = NULL;
- fl->fl_flags = 0;
- fl->fl_type = 0;
- fl->fl_start = fl->fl_end = 0;
+ INIT_LIST_HEAD(&fl->fl_link);
+ INIT_LIST_HEAD(&fl->fl_block);
+ init_waitqueue_head(&fl->fl_wait);
}
/* Allocate an empty lock structure. */
struct file_lock *locks_alloc_lock(void)
{
- struct file_lock *fl = kmem_cache_alloc(filelock_cache, GFP_KERNEL);
+ struct file_lock *fl = kmem_cache_zalloc(filelock_cache, GFP_KERNEL);
if (fl)
- locks_init_lock_always(fl);
+ locks_init_lock_heads(fl);
return fl;
}
@@ -215,27 +209,12 @@ EXPORT_SYMBOL(locks_free_lock);
void locks_init_lock(struct file_lock *fl)
{
- INIT_LIST_HEAD(&fl->fl_link);
- INIT_LIST_HEAD(&fl->fl_block);
- init_waitqueue_head(&fl->fl_wait);
- fl->fl_ops = NULL;
- fl->fl_lmops = NULL;
- locks_init_lock_always(fl);
+ memset(fl, 0, sizeof(struct file_lock));
+ locks_init_lock_heads(fl);
}
EXPORT_SYMBOL(locks_init_lock);
-/*
- * Initialises the fields of the file lock which are invariant for
- * free file_locks.
- */
-static void init_once(void *foo)
-{
- struct file_lock *lock = (struct file_lock *) foo;
-
- locks_init_lock(lock);
-}
-
static void locks_copy_private(struct file_lock *new, struct file_lock *fl)
{
if (fl->fl_ops) {
@@ -2333,8 +2312,8 @@ EXPORT_SYMBOL(lock_may_write);
static int __init filelock_init(void)
{
filelock_cache = kmem_cache_create("file_lock_cache",
- sizeof(struct file_lock), 0, SLAB_PANIC,
- init_once);
+ sizeof(struct file_lock), 0, SLAB_PANIC, NULL);
+
return 0;
}
_
Patches currently in -mm which might be from mszeredi@xxxxxxx are
origin.patch
fs-locksc-remove-init_once.patch
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