From: "Robert P. J. Day" <rpjday@crashcourse.ca>
To: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Cc: Andrew Morton <akpm@osdl.org>, matthew@wil.cx
Subject: [PATCH] Add the macro to test if "exactly_one_bit_set" to log2.h.
Date: Tue, 6 Nov 2007 11:38:52 -0500 (EST) [thread overview]
Message-ID: <Pine.LNX.4.64.0711061135310.23545@localhost.localdomain> (raw)
While this macro is defined in terms of "is_power_of_2" and is
therefore functionally equivalent, the visual semantics are sometimes
more appropriate for what is actually being tested.
Signed-off-by: Robert P. J. Day <rpjday@crashcourse.ca>
---
diff --git a/include/linux/log2.h b/include/linux/log2.h
index c8cf5e8..d0d324e 100644
--- a/include/linux/log2.h
+++ b/include/linux/log2.h
@@ -55,6 +55,12 @@ bool is_power_of_2(unsigned long n)
}
/*
+ * And for folks who want slightly different semantics ...
+ */
+
+#define exactly_one_bit_set is_power_of_2
+
+/*
* round up to nearest power of two
*/
static inline __attribute__((const))
--
========================================================================
Robert P. J. Day
Linux Consulting, Training and Annoying Kernel Pedantry
Waterloo, Ontario, CANADA
http://crashcourse.ca
========================================================================
next reply other threads:[~2007-11-06 16:40 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-11-06 16:38 Robert P. J. Day [this message]
2007-11-06 18:11 ` Boaz Harrosh
2007-11-06 18:53 ` Robert P. J. Day
2007-11-07 9:17 ` Boaz Harrosh
2007-11-09 4:36 ` Andrew Morton
2007-11-09 5:09 ` Robert P. J. Day
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