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authorChen, Kenneth W <kenneth.w.chen@intel.com>2006-03-22 00:09:02 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-03-22 07:54:04 -0800
commitbba1e9b2111b14625f670bd07e57fd7ed57ce804 (patch)
treefc46b8702597fafde7d1a550dcbc948f173303ad
parent42b88befd6e0dae1a5fe04c03925037fa890e1f3 (diff)
downloadop-kernel-dev-bba1e9b2111b14625f670bd07e57fd7ed57ce804.zip
op-kernel-dev-bba1e9b2111b14625f670bd07e57fd7ed57ce804.tar.gz
[PATCH] convert hugetlbfs_counter to atomic
Implementation of hugetlbfs_counter() is functionally equivalent to atomic_inc_return(). Use the simpler atomic form. Signed-off-by: Ken Chen <kenneth.w.chen@intel.com> Cc: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
-rw-r--r--fs/hugetlbfs/inode.c18
1 files changed, 2 insertions, 16 deletions
diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c
index 1a1c2fc..25fa8bb 100644
--- a/fs/hugetlbfs/inode.c
+++ b/fs/hugetlbfs/inode.c
@@ -737,21 +737,6 @@ static struct file_system_type hugetlbfs_fs_type = {
static struct vfsmount *hugetlbfs_vfsmount;
-/*
- * Return the next identifier for a shm file
- */
-static unsigned long hugetlbfs_counter(void)
-{
- static DEFINE_SPINLOCK(lock);
- static unsigned long counter;
- unsigned long ret;
-
- spin_lock(&lock);
- ret = ++counter;
- spin_unlock(&lock);
- return ret;
-}
-
static int can_do_hugetlb_shm(void)
{
return likely(capable(CAP_IPC_LOCK) ||
@@ -767,6 +752,7 @@ struct file *hugetlb_zero_setup(size_t size)
struct dentry *dentry, *root;
struct qstr quick_string;
char buf[16];
+ static atomic_t counter;
if (!can_do_hugetlb_shm())
return ERR_PTR(-EPERM);
@@ -775,7 +761,7 @@ struct file *hugetlb_zero_setup(size_t size)
return ERR_PTR(-ENOMEM);
root = hugetlbfs_vfsmount->mnt_root;
- snprintf(buf, 16, "%lu", hugetlbfs_counter());
+ snprintf(buf, 16, "%u", atomic_inc_return(&counter));
quick_string.name = buf;
quick_string.len = strlen(quick_string.name);
quick_string.hash = 0;
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