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authorMatthew Wilcox <willy@infradead.org>2018-10-31 21:39:28 +0300
committerMatthew Wilcox <willy@infradead.org>2018-11-06 00:38:08 +0300
commitc5beb07e7a06b24f4f27304f6282b5dbd929543b (patch)
treedddd6ce81475ebd3ab56fff6e55efe60d0802393 /lib
parent4c0608f4a0e76dfb82d3accd20081f4bf47ed143 (diff)
downloadlinux-c5beb07e7a06b24f4f27304f6282b5dbd929543b.tar.xz
XArray: Unify xa_cmpxchg and __xa_cmpxchg
xa_cmpxchg() was one of the largest functions in the xarray implementation. By turning it into a wrapper and having the callers take the lock (like several other functions), we save 160 bytes on a tinyconfig build and reduce the duplication in xarray.c. Signed-off-by: Matthew Wilcox <willy@infradead.org>
Diffstat (limited to 'lib')
-rw-r--r--lib/xarray.c41
1 files changed, 0 insertions, 41 deletions
diff --git a/lib/xarray.c b/lib/xarray.c
index 9cab8cfef8a8..77671d4a7910 100644
--- a/lib/xarray.c
+++ b/lib/xarray.c
@@ -1407,47 +1407,6 @@ void *__xa_store(struct xarray *xa, unsigned long index, void *entry, gfp_t gfp)
EXPORT_SYMBOL(__xa_store);
/**
- * xa_cmpxchg() - Conditionally replace an entry in the XArray.
- * @xa: XArray.
- * @index: Index into array.
- * @old: Old value to test against.
- * @entry: New value to place in array.
- * @gfp: Memory allocation flags.
- *
- * 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: Process context. Takes and releases the xa_lock. May sleep
- * if the @gfp flags permit.
- * 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)
-{
- XA_STATE(xas, xa, index);
- void *curr;
-
- if (WARN_ON_ONCE(xa_is_internal(entry)))
- return XA_ERROR(-EINVAL);
-
- do {
- xas_lock(&xas);
- curr = xas_load(&xas);
- if (curr == XA_ZERO_ENTRY)
- curr = NULL;
- if (curr == old) {
- xas_store(&xas, entry);
- if (xa_track_free(xa) && entry)
- xas_clear_mark(&xas, XA_FREE_MARK);
- }
- xas_unlock(&xas);
- } while (xas_nomem(&xas, gfp));
-
- return xas_result(&xas, curr);
-}
-EXPORT_SYMBOL(xa_cmpxchg);
-
-/**
* __xa_cmpxchg() - Store this entry in the XArray.
* @xa: XArray.
* @index: Index into array.