diff options
| author |   Bartosz Golaszewski <bgolaszewski@baylibre.com> | 2019-12-17 18:48:55 +0100 |
|---|---|---|
| committer | Bartosz Golaszewski <bgolaszewski@baylibre.com> | 2020-02-12 12:05:46 +0100 |
| commit | 3f2e4c11e136e2cffd60dbc840b59ff65f017328 (patch) | |
| tree | a1af72d57e5e1f4d1245560f2fa8d4c8fa32c8c0 | |
| parent | gpio: wcd934x: Fix logic of wcd_gpio_get (diff) | |
| download | wireguard-linux-3f2e4c11e136e2cffd60dbc840b59ff65f017328.tar.xz wireguard-linux-3f2e4c11e136e2cffd60dbc840b59ff65f017328.zip | |
kfifo: provide noirqsave variants of spinlocked in and out helpers
Provide variants of spinlocked kfifo_in() and kfifo_out() routines which
don't disable interrupts.
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Acked-by: Stefani Seibold <stefani@seibold.net>
| -rw-r--r-- | include/linux/kfifo.h | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/include/linux/kfifo.h b/include/linux/kfifo.h index fc4b0b10210f..123c200ed7cb 100644 --- a/include/linux/kfifo.h +++ b/include/linux/kfifo.h @@ -517,6 +517,26 @@ __kfifo_uint_must_check_helper( \ __ret; \ }) +/** + * kfifo_in_spinlocked_noirqsave - put data into fifo using a spinlock for + * locking, don't disable interrupts + * @fifo: address of the fifo to be used + * @buf: the data to be added + * @n: number of elements to be added + * @lock: pointer to the spinlock to use for locking + * + * This is a variant of kfifo_in_spinlocked() but uses spin_lock/unlock() + * for locking and doesn't disable interrupts. + */ +#define kfifo_in_spinlocked_noirqsave(fifo, buf, n, lock) \ +({ \ + unsigned int __ret; \ + spin_lock(lock); \ + __ret = kfifo_in(fifo, buf, n); \ + spin_unlock(lock); \ + __ret; \ +}) + /* alias for kfifo_in_spinlocked, will be removed in a future release */ #define kfifo_in_locked(fifo, buf, n, lock) \ kfifo_in_spinlocked(fifo, buf, n, lock) @@ -569,6 +589,28 @@ __kfifo_uint_must_check_helper( \ }) \ ) +/** + * kfifo_out_spinlocked_noirqsave - get data from the fifo using a spinlock + * for locking, don't disable interrupts + * @fifo: address of the fifo to be used + * @buf: pointer to the storage buffer + * @n: max. number of elements to get + * @lock: pointer to the spinlock to use for locking + * + * This is a variant of kfifo_out_spinlocked() which uses spin_lock/unlock() + * for locking and doesn't disable interrupts. + */ +#define kfifo_out_spinlocked_noirqsave(fifo, buf, n, lock) \ +__kfifo_uint_must_check_helper( \ +({ \ + unsigned int __ret; \ + spin_lock(lock); \ + __ret = kfifo_out(fifo, buf, n); \ + spin_unlock(lock); \ + __ret; \ +}) \ +) + /* alias for kfifo_out_spinlocked, will be removed in a future release */ #define kfifo_out_locked(fifo, buf, n, lock) \ kfifo_out_spinlocked(fifo, buf, n, lock) |