kernel/kfifo.c: replace conditional test with is_power_of_2()

[sfrench/cifs-2.6.git] / kernel / kfifo.c

diff --git a/kernel/kfifo.c b/kernel/kfifo.c
index 5d1d907378a299ad6c6aab16b15d55d1248f296e..26539e3228e50f81ca892122a23b6bd1fcf98fe6 100644 (file)
--- a/kernel/kfifo.c
+++ b/kernel/kfifo.c
@@ -24,6 +24,7 @@
 #include <linux/slab.h>
 #include <linux/err.h>
 #include <linux/kfifo.h>
+#include <linux/log2.h>
 
 /**
  * kfifo_init - allocates a new FIFO using a preallocated buffer
@@ -32,8 +33,8 @@
  * @gfp_mask: get_free_pages mask, passed to kmalloc()
  * @lock: the lock to be used to protect the fifo buffer
  *
- * Do NOT pass the kfifo to kfifo_free() after use ! Simply free the
- * struct kfifo with kfree().
+ * Do NOT pass the kfifo to kfifo_free() after use! Simply free the
+ * &struct kfifo with kfree().
  */
 struct kfifo *kfifo_init(unsigned char *buffer, unsigned int size,
                         gfp_t gfp_mask, spinlock_t *lock)
@@ -41,7 +42,7 @@ struct kfifo *kfifo_init(unsigned char *buffer, unsigned int size,
        struct kfifo *fifo;
 
        /* size must be a power of 2 */
-       BUG_ON(size & (size - 1));
+       BUG_ON(!is_power_of_2(size));
 
        fifo = kmalloc(sizeof(struct kfifo), gfp_mask);
        if (!fifo)
@@ -71,9 +72,9 @@ struct kfifo *kfifo_alloc(unsigned int size, gfp_t gfp_mask, spinlock_t *lock)
 
        /*
         * round up to the next power of 2, since our 'let the indices
-        * wrap' tachnique works only in this case.
+        * wrap' technique works only in this case.
         */
-       if (size & (size - 1)) {
+       if (!is_power_of_2(size)) {
                BUG_ON(size > 0x80000000);
                size = roundup_pow_of_two(size);
        }
@@ -108,7 +109,7 @@ EXPORT_SYMBOL(kfifo_free);
  * @buffer: the data to be added.
  * @len: the length of the data to be added.
  *
- * This function copies at most 'len' bytes from the 'buffer' into
+ * This function copies at most @len bytes from the @buffer into
  * the FIFO depending on the free space, and returns the number of
  * bytes copied.
  *
@@ -155,8 +156,8 @@ EXPORT_SYMBOL(__kfifo_put);
  * @buffer: where the data must be copied.
  * @len: the size of the destination buffer.
  *
- * This function copies at most 'len' bytes from the FIFO into the
- * 'buffer' and returns the number of copied bytes.
+ * This function copies at most @len bytes from the FIFO into the
+ * @buffer and returns the number of copied bytes.
  *
  * Note that with only one concurrent reader and one concurrent
  * writer, you don't need extra locking to use these functions.