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Message-ID: <Pine.LNX.4.64.0711061135310.23545@localhost.localdomain> 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 ======================================================================== - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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