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author | Matthew Wilcox <willy@infradead.org> | 2019-02-20 11:51:22 -0500 |
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committer | Matthew Wilcox <willy@infradead.org> | 2019-02-20 17:08:54 -0500 |
commit | 962033d55d0761e0716a01a715c6659c8c8dfc41 (patch) | |
tree | 436d84076c3e16836a59efe46b75d2900a560add /lib/xarray.c | |
parent | b38f6c50270683abf35a388f82cafecce971a003 (diff) | |
download | linux-962033d55d0761e0716a01a715c6659c8c8dfc41.tar.bz2 |
XArray: Use xa_cmpxchg to implement xa_reserve
Jason feels this is clearer, and it saves a function and an exported
symbol.
Suggested-by: Jason Gunthorpe <jgg@ziepe.ca>
Signed-off-by: Matthew Wilcox <willy@infradead.org>
Diffstat (limited to 'lib/xarray.c')
-rw-r--r-- | lib/xarray.c | 36 |
1 files changed, 0 insertions, 36 deletions
diff --git a/lib/xarray.c b/lib/xarray.c index b9a6cf42feee..3f10198f00b7 100644 --- a/lib/xarray.c +++ b/lib/xarray.c @@ -1484,42 +1484,6 @@ int __xa_insert(struct xarray *xa, unsigned long index, void *entry, gfp_t gfp) } EXPORT_SYMBOL(__xa_insert); -/** - * __xa_reserve() - Reserve this index in the XArray. - * @xa: XArray. - * @index: Index into array. - * @gfp: Memory allocation flags. - * - * Ensures there is somewhere to store an entry at @index in the array. - * If there is already something stored at @index, this function does - * nothing. If there was nothing there, the entry is marked as reserved. - * Loading from a reserved entry returns a %NULL pointer. - * - * If you do not use the entry that you have reserved, call xa_release() - * or xa_erase() to free any unnecessary memory. - * - * Context: Any context. Expects the xa_lock to be held on entry. May - * release the lock, sleep and reacquire the lock if the @gfp flags permit. - * Return: 0 if the reservation succeeded or -ENOMEM if it failed. - */ -int __xa_reserve(struct xarray *xa, unsigned long index, gfp_t gfp) -{ - XA_STATE(xas, xa, index); - void *curr; - - do { - curr = xas_load(&xas); - if (!curr) { - xas_store(&xas, XA_ZERO_ENTRY); - if (xa_track_free(xa)) - xas_clear_mark(&xas, XA_FREE_MARK); - } - } while (__xas_nomem(&xas, gfp)); - - return xas_error(&xas); -} -EXPORT_SYMBOL(__xa_reserve); - #ifdef CONFIG_XARRAY_MULTI static void xas_set_range(struct xa_state *xas, unsigned long first, unsigned long last) |