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authorMatthew Wilcox <willy@infradead.org>2018-11-26 16:08:43 -0500
committerMatthew Wilcox <willy@infradead.org>2018-12-06 08:26:17 -0500
commit55f3f7eab75c10d9b33d122670b5935ab64db50f (patch)
tree6a601ac3c08993730dfade808fe6806e1bfbf98c /include/linux/xarray.h
parenteff3860bbfedbac6edac57fb0d7f3a60e860c1c3 (diff)
downloadlinux-stericsson-55f3f7eab75c10d9b33d122670b5935ab64db50f.tar.gz
XArray: Add xa_cmpxchg_irq and xa_cmpxchg_bh
These convenience wrappers match the other _irq and _bh wrappers we already have. It turns out I'd already open-coded xa_cmpxchg_irq() in the shmem code, so convert that. Signed-off-by: Matthew Wilcox <willy@infradead.org>
Diffstat (limited to 'include/linux/xarray.h')
-rw-r--r--include/linux/xarray.h54
1 files changed, 54 insertions, 0 deletions
diff --git a/include/linux/xarray.h b/include/linux/xarray.h
index 564892e19f8c..f492e21c4aa2 100644
--- a/include/linux/xarray.h
+++ b/include/linux/xarray.h
@@ -554,6 +554,60 @@ static inline void *xa_cmpxchg(struct xarray *xa, unsigned long index,
}
/**
+ * xa_cmpxchg_bh() - 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.
+ *
+ * This function is like calling xa_cmpxchg() except it disables softirqs
+ * while holding the array lock.
+ *
+ * Context: Any context. Takes and releases the xa_lock while
+ * disabling softirqs. May sleep if the @gfp flags permit.
+ * Return: The old value at this index or xa_err() if an error happened.
+ */
+static inline void *xa_cmpxchg_bh(struct xarray *xa, unsigned long index,
+ void *old, void *entry, gfp_t gfp)
+{
+ void *curr;
+
+ xa_lock_bh(xa);
+ curr = __xa_cmpxchg(xa, index, old, entry, gfp);
+ xa_unlock_bh(xa);
+
+ return curr;
+}
+
+/**
+ * xa_cmpxchg_irq() - 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.
+ *
+ * This function is like calling xa_cmpxchg() except it disables interrupts
+ * while holding the array lock.
+ *
+ * Context: Process context. Takes and releases the xa_lock while
+ * disabling interrupts. May sleep if the @gfp flags permit.
+ * Return: The old value at this index or xa_err() if an error happened.
+ */
+static inline void *xa_cmpxchg_irq(struct xarray *xa, unsigned long index,
+ void *old, void *entry, gfp_t gfp)
+{
+ void *curr;
+
+ xa_lock_irq(xa);
+ curr = __xa_cmpxchg(xa, index, old, entry, gfp);
+ xa_unlock_irq(xa);
+
+ return curr;
+}
+
+/**
* xa_insert() - Store this entry in the XArray unless another entry is
* already present.
* @xa: XArray.