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XArray: Update xa_erase family descriptions

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xa_erase does not allocate memory and doesn't have a gfp parameter.
Update the descriptions of all four variants to be more useful.

Signed-off-by: Matthew Wilcox <willy@infradead.org>
This commit is contained in:
Matthew Wilcox
2019-01-26 00:52:26 -05:00
parent bd54211b8e
commit 809ab9371c
2 changed files with 14 additions and 15 deletions
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17
lib/xarray.c
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@@ -1294,13 +1294,12 @@ static void *xas_result(struct xa_state *xas, void *curr)
* @xa: XArray.
* @index: Index into array.
*
* If the entry at this index is a multi-index entry then all indices will
* be erased, and the entry will no longer be a multi-index entry.
* This function expects the xa_lock to be held on entry.
* After this function returns, loading from @index will return %NULL.
* If the index is part of a multi-index entry, all indices will be erased
* and none of the entries will be part of a multi-index entry.
*
* 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.
* Context: Any context. Expects xa_lock to be held on entry.
* Return: The entry which used to be at this index.
*/
void *__xa_erase(struct xarray *xa, unsigned long index)
{
@@ -1314,9 +1313,9 @@ EXPORT_SYMBOL(__xa_erase);
* @xa: XArray.
* @index: Index of entry.
*
* This function is the equivalent of calling xa_store() with %NULL as
* the third argument. The XArray does not need to allocate memory, so
* the user does not need to provide GFP flags.
* After this function returns, loading from @index will return %NULL.
* If the index is part of a multi-index entry, all indices will be erased
* and none of the entries will be part of a multi-index entry.
*
* Context: Any context. Takes and releases the xa_lock.
* Return: The entry which used to be at this index.