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authorMatthew Wilcox <willy@infradead.org>2018-10-26 21:41:29 +0300
committerMatthew Wilcox <willy@infradead.org>2018-11-06 00:38:09 +0300
commit84e5acb76dacb8ebd648a86a53907ce0dd616534 (patch)
tree21bd8958fbf6ae3c7195931876037fc174ea5ce7 /include/linux/xarray.h
parent9c16bb88905456a9b1299338041f05fa7699971b (diff)
downloadlinux-84e5acb76dacb8ebd648a86a53907ce0dd616534.tar.xz
XArray: Add xa_store_bh() and xa_store_irq()
These convenience wrappers disable interrupts while taking the spinlock. A number of drivers would otherwise have to open-code these functions. Signed-off-by: Matthew Wilcox <willy@infradead.org>
Diffstat (limited to 'include/linux/xarray.h')
-rw-r--r--include/linux/xarray.h52
1 files changed, 52 insertions, 0 deletions
diff --git a/include/linux/xarray.h b/include/linux/xarray.h
index 4c839c17a99b..52d9732e4ec4 100644
--- a/include/linux/xarray.h
+++ b/include/linux/xarray.h
@@ -427,6 +427,58 @@ static inline int __xa_insert(struct xarray *xa, unsigned long index,
}
/**
+ * xa_store_bh() - Store this entry in the XArray.
+ * @xa: XArray.
+ * @index: Index into array.
+ * @entry: New entry.
+ * @gfp: Memory allocation flags.
+ *
+ * This function is like calling xa_store() except it disables softirqs
+ * while holding the array lock.
+ *
+ * Context: Any context. Takes and releases the xa_lock while
+ * disabling softirqs.
+ * Return: The entry which used to be at this index.
+ */
+static inline void *xa_store_bh(struct xarray *xa, unsigned long index,
+ void *entry, gfp_t gfp)
+{
+ void *curr;
+
+ xa_lock_bh(xa);
+ curr = __xa_store(xa, index, entry, gfp);
+ xa_unlock_bh(xa);
+
+ return curr;
+}
+
+/**
+ * xa_store_irq() - Erase this entry from the XArray.
+ * @xa: XArray.
+ * @index: Index into array.
+ * @entry: New entry.
+ * @gfp: Memory allocation flags.
+ *
+ * This function is like calling xa_store() except it disables interrupts
+ * while holding the array lock.
+ *
+ * Context: Process context. Takes and releases the xa_lock while
+ * disabling interrupts.
+ * Return: The entry which used to be at this index.
+ */
+static inline void *xa_store_irq(struct xarray *xa, unsigned long index,
+ void *entry, gfp_t gfp)
+{
+ void *curr;
+
+ xa_lock_irq(xa);
+ curr = __xa_store(xa, index, entry, gfp);
+ xa_unlock_irq(xa);
+
+ return curr;
+}
+
+/**
* xa_erase_bh() - Erase this entry from the XArray.
* @xa: XArray.
* @index: Index of entry.