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authorHeiner Kallweit <hkallweit1@gmail.com>2017-07-11 01:50:52 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2017-07-11 02:32:34 +0300
commitcde1b69389772ca8855fabdfe5d9ae9ba1d7d33a (patch)
treeace4c5512a210356e5fc128697af92c4e66d5d2f /fs/proc
parentb6d0f14abb7c1d9d522c064633c820aaeb9bbfbf (diff)
downloadlinux-cde1b69389772ca8855fabdfe5d9ae9ba1d7d33a.tar.xz
fs/proc/generic.c: switch to ida_simple_get/remove
The code can be much simplified by switching to ida_simple_get/remove. Link: http://lkml.kernel.org/r/8d1cc9f7-5115-c9dc-028e-c0770b6bfe1f@gmail.com Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/proc')
-rw-r--r--fs/proc/generic.c32
1 files changed, 7 insertions, 25 deletions
diff --git a/fs/proc/generic.c b/fs/proc/generic.c
index 9425c0d97262..e3cda0b5968f 100644
--- a/fs/proc/generic.c
+++ b/fs/proc/generic.c
@@ -180,7 +180,6 @@ static int xlate_proc_name(const char *name, struct proc_dir_entry **ret,
}
static DEFINE_IDA(proc_inum_ida);
-static DEFINE_SPINLOCK(proc_inum_lock); /* protects the above */
#define PROC_DYNAMIC_FIRST 0xF0000000U
@@ -190,37 +189,20 @@ static DEFINE_SPINLOCK(proc_inum_lock); /* protects the above */
*/
int proc_alloc_inum(unsigned int *inum)
{
- unsigned int i;
- int error;
+ int i;
-retry:
- if (!ida_pre_get(&proc_inum_ida, GFP_KERNEL))
- return -ENOMEM;
+ i = ida_simple_get(&proc_inum_ida, 0, UINT_MAX - PROC_DYNAMIC_FIRST + 1,
+ GFP_KERNEL);
+ if (i < 0)
+ return i;
- spin_lock_irq(&proc_inum_lock);
- error = ida_get_new(&proc_inum_ida, &i);
- spin_unlock_irq(&proc_inum_lock);
- if (error == -EAGAIN)
- goto retry;
- else if (error)
- return error;
-
- if (i > UINT_MAX - PROC_DYNAMIC_FIRST) {
- spin_lock_irq(&proc_inum_lock);
- ida_remove(&proc_inum_ida, i);
- spin_unlock_irq(&proc_inum_lock);
- return -ENOSPC;
- }
- *inum = PROC_DYNAMIC_FIRST + i;
+ *inum = PROC_DYNAMIC_FIRST + (unsigned int)i;
return 0;
}
void proc_free_inum(unsigned int inum)
{
- unsigned long flags;
- spin_lock_irqsave(&proc_inum_lock, flags);
- ida_remove(&proc_inum_ida, inum - PROC_DYNAMIC_FIRST);
- spin_unlock_irqrestore(&proc_inum_lock, flags);
+ ida_simple_remove(&proc_inum_ida, inum - PROC_DYNAMIC_FIRST);
}
/*