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| author | Joerg Roedel <joerg.roedel@amd.com> | 2008-07-29 22:33:42 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-07-30 09:41:46 -0700 |
| commit | 204b885e7322656284626949e51f292fe61313fa (patch) | |
| tree | 8cf2371c6f4892ae2ffef5d448698f99c5d71777 /include/linux/kernel.h | |
| parent | 87547ee95d81ec0ee1503fcaf9c9594469bc2510 (diff) | |
| download | lwn-204b885e7322656284626949e51f292fe61313fa.tar.gz lwn-204b885e7322656284626949e51f292fe61313fa.zip | |
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/kernel.h')
| -rw-r--r-- | include/linux/kernel.h | 6 |
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[]; */ #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_ALERT "<1>" /* action must be taken immediately */ #define KERN_CRIT "<2>" /* critical conditions */ |