Messages in this thread Patch in this message | | | From | Joerg Roedel <> | Subject | [PATCH] introduce lower_32_bits() macro | Date | Fri, 25 Jul 2008 17:12:27 +0200 |
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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.
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com> --- 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 f9cd7a5..6fd2977 100644 --- a/include/linux/kernel.h +++ b/include/linux/kernel.h @@ -73,6 +73,12 @@ 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) ((n) & 0xffffffffULL) + #define KERN_EMERG "<0>" /* system is unusable */ #define KERN_ALERT "<1>" /* action must be taken immediately */ #define KERN_CRIT "<2>" /* critical conditions */ -- 1.5.3.7
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