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authorJoerg Roedel <joerg.roedel@amd.com>2008-07-30 01:33:42 -0400
committerLinus Torvalds <torvalds@linux-foundation.org>2008-07-30 12:41:46 -0400
commit204b885e7322656284626949e51f292fe61313fa (patch)
tree8cf2371c6f4892ae2ffef5d448698f99c5d71777 /include/linux
parent87547ee95d81ec0ee1503fcaf9c9594469bc2510 (diff)
introduce lower_32_bits() macro
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>
Diffstat (limited to 'include/linux')
-rw-r--r--include/linux/kernel.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/include/linux/kernel.h b/include/linux/kernel.h
index fdbbf72ca2eb..aaa998f65c7a 100644
--- a/include/linux/kernel.h
+++ b/include/linux/kernel.h
@@ -75,6 +75,12 @@ extern const char linux_proc_banner[];
75 */ 75 */
76#define upper_32_bits(n) ((u32)(((n) >> 16) >> 16)) 76#define upper_32_bits(n) ((u32)(((n) >> 16) >> 16))
77 77
78/**
79 * lower_32_bits - return bits 0-31 of a number
80 * @n: the number we're accessing
81 */
82#define lower_32_bits(n) ((u32)(n))
83
78#define KERN_EMERG "<0>" /* system is unusable */ 84#define KERN_EMERG "<0>" /* system is unusable */
79#define KERN_ALERT "<1>" /* action must be taken immediately */ 85#define KERN_ALERT "<1>" /* action must be taken immediately */
80#define KERN_CRIT "<2>" /* critical conditions */ 86#define KERN_CRIT "<2>" /* critical conditions */