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fs/proc/generic.c: switch to ida_simple_get/remove

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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>
This commit is contained in:
Heiner Kallweit 2017-07-10 15:50:52 -07:00 • committed by Linus Torvalds
parent b6d0f14abb
commit cde1b69389
1 changed files with 7 additions and 25 deletions
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32
fs/proc/generic.c
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@ -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_IDA(proc_inum_ida);
static DEFINE_SPINLOCK(proc_inum_lock); /* protects the above */
#define PROC_DYNAMIC_FIRST 0xF0000000U #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) int proc_alloc_inum(unsigned int *inum)
{ {
unsigned int i; int i;
int error;
retry: i = ida_simple_get(&proc_inum_ida, 0, UINT_MAX - PROC_DYNAMIC_FIRST + 1,
if (!ida_pre_get(&proc_inum_ida, GFP_KERNEL)) GFP_KERNEL);
return -ENOMEM; if (i < 0)
return i;
spin_lock_irq(&proc_inum_lock); *inum = PROC_DYNAMIC_FIRST + (unsigned int)i;
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;
return 0; return 0;
} }
void proc_free_inum(unsigned int inum) void proc_free_inum(unsigned int inum)
{ {
unsigned long flags; ida_simple_remove(&proc_inum_ida, inum - PROC_DYNAMIC_FIRST);
spin_lock_irqsave(&proc_inum_lock, flags);
ida_remove(&proc_inum_ida, inum - PROC_DYNAMIC_FIRST);
spin_unlock_irqrestore(&proc_inum_lock, flags);
} }
/* /*