linux-kernel - [PATCH] Replace conditional test with is_power_of

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Date:	Fri, 24 Apr 2009 08:59:07 -0400 (EDT)
From:	"Robert P. J. Day" <rpjday@...shcourse.ca>
To:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
cc:	Andrew Morton <akpm@...l.org>
Subject: [PATCH] Replace conditional test with is_power_of_2().


Signed-off-by: Robert P. J. Day <rpjday@...shcourse.ca>

---

  yes, i know the word "tachnique" is misspelled there.  that's not
part of this patch so i'm not fixing it here.


diff --git a/kernel/kfifo.c b/kernel/kfifo.c
index bc41ad0..04a1748 100644
--- a/kernel/kfifo.c
+++ b/kernel/kfifo.c
@@ -74,7 +74,7 @@ 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.
 	 */
-	if (size & (size - 1)) {
+	if (!is_power_of_2(size)) {
 		BUG_ON(size > 0x80000000);
 		size = roundup_pow_of_two(size);
 	}

========================================================================
Robert P. J. Day                               Waterloo, Ontario, CANADA

        Linux Consulting, Training and Annoying Kernel Pedantry.

Web page:                                          http://crashcourse.ca
Linked In:                             http://www.linkedin.com/in/rpjday
Twitter:                                       http://twitter.com/rpjday
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