diff options
Diffstat (limited to 'lib/xarray.c')
| -rw-r--r-- | lib/xarray.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/lib/xarray.c b/lib/xarray.c index 9644b18af18d..76dde3a1cacf 100644 --- a/lib/xarray.c +++ b/lib/xarray.c @@ -1742,20 +1742,23 @@ static inline void *__xa_cmpxchg_raw(struct xarray *xa, unsigned long index, void *old, void *entry, gfp_t gfp); /** - * __xa_cmpxchg() - Store this entry in the XArray. + * __xa_cmpxchg() - Conditionally replace an entry in the XArray. * @xa: XArray. * @index: Index into array. * @old: Old value to test against. - * @entry: New entry. + * @entry: New value to place in array. * @gfp: Memory allocation flags. * * You must already be holding the xa_lock when calling this function. * It will drop the lock if needed to allocate memory, and then reacquire * it afterwards. * + * If the entry at @index is the same as @old, replace it with @entry. + * If the return value is equal to @old, then the exchange was successful. + * * Context: Any context. Expects xa_lock to be held on entry. May * release and reacquire xa_lock if @gfp flags permit. - * Return: The old entry at this index or xa_err() if an error happened. + * Return: The old value at this index or xa_err() if an error happened. */ void *__xa_cmpxchg(struct xarray *xa, unsigned long index, void *old, void *entry, gfp_t gfp) |