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author | 2019-12-17 11:30:59 +0100 | |
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committer | 2020-02-12 12:05:46 +0100 | |
commit | 5195a89e8583bba43ec13871a7226763e401b44e (patch) | |
tree | 7238cd9aeb9be1dfd37c18e4a6e17d8a05600720 /include/linux/kfifo.h | |
parent | kfifo: provide noirqsave variants of spinlocked in and out helpers (diff) | |
download | linux-5195a89e8583bba43ec13871a7226763e401b44e.tar.gz linux-5195a89e8583bba43ec13871a7226763e401b44e.tar.bz2 linux-5195a89e8583bba43ec13871a7226763e401b44e.zip |
kfifo: provide kfifo_is_empty_spinlocked()
Provide two spinlocked versions of kfifo_is_empty() to be used with
spinlocked variants of kfifo_in() and kfifo_out().
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Acked-by: Stefani Seibold <stefani@seibold.net>
Diffstat (limited to 'include/linux/kfifo.h')
-rw-r--r-- | include/linux/kfifo.h | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/include/linux/kfifo.h b/include/linux/kfifo.h index 123c200ed7cb..86249476b57f 100644 --- a/include/linux/kfifo.h +++ b/include/linux/kfifo.h @@ -247,6 +247,37 @@ __kfifo_int_must_check_helper(int val) }) /** + * kfifo_is_empty_spinlocked - returns true if the fifo is empty using + * a spinlock for locking + * @fifo: address of the fifo to be used + * @lock: spinlock to be used for locking + */ +#define kfifo_is_empty_spinlocked(fifo, lock) \ +({ \ + unsigned long __flags; \ + bool __ret; \ + spin_lock_irqsave(lock, __flags); \ + __ret = kfifo_is_empty(fifo); \ + spin_unlock_irqrestore(lock, __flags); \ + __ret; \ +}) + +/** + * kfifo_is_empty_spinlocked_noirqsave - returns true if the fifo is empty + * using a spinlock for locking, doesn't disable interrupts + * @fifo: address of the fifo to be used + * @lock: spinlock to be used for locking + */ +#define kfifo_is_empty_spinlocked_noirqsave(fifo, lock) \ +({ \ + bool __ret; \ + spin_lock(lock); \ + __ret = kfifo_is_empty(fifo); \ + spin_unlock(lock); \ + __ret; \ +}) + +/** * kfifo_is_full - returns true if the fifo is full * @fifo: address of the fifo to be used */ |