diff options
author | Matthew Wilcox <willy@infradead.org> | 2018-10-26 14:41:29 -0400 |
---|---|---|
committer | Matthew Wilcox <willy@infradead.org> | 2018-11-05 16:38:09 -0500 |
commit | 84e5acb76dacb8ebd648a86a53907ce0dd616534 (patch) | |
tree | 21bd8958fbf6ae3c7195931876037fc174ea5ce7 /include/linux/xarray.h | |
parent | 9c16bb88905456a9b1299338041f05fa7699971b (diff) | |
download | linux-stable-84e5acb76dacb8ebd648a86a53907ce0dd616534.tar.gz linux-stable-84e5acb76dacb8ebd648a86a53907ce0dd616534.tar.bz2 linux-stable-84e5acb76dacb8ebd648a86a53907ce0dd616534.zip |
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.h | 52 |
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. |