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introduce lower_32_bits() macro

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The file kernel.h contains the upper_32_bits macro.  This patch adds the
other part, the lower_32_bits macro.  Its first use will be in the driver
for AMD IOMMU.

Cc: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Joerg Roedel 2008-07-29 22:33:42 -07:00 committed by Linus Torvalds
parent 87547ee95d
commit 204b885e73
1 changed files with 6 additions and 0 deletions
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6
include/linux/kernel.h
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@ -75,6 +75,12 @@ extern const char linux_proc_banner[];
*/ */
#define upper_32_bits(n) ((u32)(((n) >> 16) >> 16)) #define upper_32_bits(n) ((u32)(((n) >> 16) >> 16))
/**
* lower_32_bits - return bits 0-31 of a number
* @n: the number we're accessing
*/
#define lower_32_bits(n) ((u32)(n))
#define KERN_EMERG "<0>" /* system is unusable */ #define KERN_EMERG "<0>" /* system is unusable */
#define KERN_ALERT "<1>" /* action must be taken immediately */ #define KERN_ALERT "<1>" /* action must be taken immediately */
#define KERN_CRIT "<2>" /* critical conditions */ #define KERN_CRIT "<2>" /* critical conditions */