linux-kernel - [PATCH] Add the macro to test if "exactly_one_bit

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Date:	Tue, 6 Nov 2007 11:38:52 -0500 (EST)
From:	"Robert P. J. Day" <rpjday@...shcourse.ca>
To:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
cc:	Andrew Morton <akpm@...l.org>, matthew@....cx
Subject: [PATCH] Add the macro to test if "exactly_one_bit_set" to log2.h.

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@...shcourse.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
========================================================================
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