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author | Matthew Wilcox <willy@infradead.org> | 2018-10-01 21:54:59 +0300 |
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committer | Matthew Wilcox <willy@infradead.org> | 2018-10-21 17:46:00 +0300 |
commit | 9f14d4f1f1045f161fd4db8a8e194b7825c2874a (patch) | |
tree | fcc3e832d34116dec5dfe2e36525cbdb81cc47c8 /Documentation | |
parent | 2264f5132fe45571139727ebdeb78696b35d1506 (diff) | |
download | linux-9f14d4f1f1045f161fd4db8a8e194b7825c2874a.tar.xz |
xarray: Add xa_reserve and xa_release
This function reserves a slot in the XArray for users which need
to acquire multiple locks before storing their entry in the tree and
so cannot use a plain xa_store().
Signed-off-by: Matthew Wilcox <willy@infradead.org>
Diffstat (limited to 'Documentation')
-rw-r--r-- | Documentation/core-api/xarray.rst | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/Documentation/core-api/xarray.rst b/Documentation/core-api/xarray.rst index 4b101b4f3aa1..2b397da84bcd 100644 --- a/Documentation/core-api/xarray.rst +++ b/Documentation/core-api/xarray.rst @@ -293,6 +293,12 @@ to :c:func:`xas_retry`, and retry the operation if it returns ``true``. of this RCU period. You should restart the lookup from the head of the array. + * - Zero + - :c:func:`xa_is_zero` + - Zero entries appear as ``NULL`` through the Normal API, but occupy + an entry in the XArray which can be used to reserve the index for + future use. + Other internal entries may be added in the future. As far as possible, they will be handled by :c:func:`xas_retry`. |