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| author | Heiner Kallweit <hkallweit1@gmail.com> | 2017-07-11 00:50:52 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2017-07-11 01:32:34 +0200 |
| commit | cde1b69389772ca8855fabdfe5d9ae9ba1d7d33a (patch) | |
| tree | ace4c5512a210356e5fc128697af92c4e66d5d2f /fs/proc/generic.c | |
| parent | frv: cmpxchg: implement cmpxchg64() (diff) | |
| download | linux-cde1b69389772ca8855fabdfe5d9ae9ba1d7d33a.tar.xz linux-cde1b69389772ca8855fabdfe5d9ae9ba1d7d33a.zip | |
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 '')
| -rw-r--r-- | fs/proc/generic.c | 32 |
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); } /* |