[PATCH] kernel: rounddown helper function
in [Kernel]
|
Prev: [GIT PULL] xen-netfront driver updates for 2.6.36
Next: [PATCH 4/5] samples: kprobe_example: Make it print something on MIPS.
From: Eric Paris on 3 Aug 2010 14:20 The roundup() helper function will round a given value up to a multiple of another given value. aka roundup(11, 7) would give 14 = 7 * 2. This new function does the opposite. It will round a given number down to the nearest multiple of the second number: rounddown(11, 7) would give 7. I need this in some future SELinux code and can carry the macro myself, but figured I would put it in the core kernel so others might find and use it if need be. Signed-off-by: Eric Paris <eparis(a)redhat.com> --- include/linux/kernel.h | 1 + 1 files changed, 1 insertions(+), 0 deletions(-) diff --git a/include/linux/kernel.h b/include/linux/kernel.h index 7d5b10f..d6092fd 100644 --- a/include/linux/kernel.h +++ b/include/linux/kernel.h @@ -59,6 +59,7 @@ extern const char linux_proc_banner[]; #define FIELD_SIZEOF(t, f) (sizeof(((t*)0)->f)) #define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d)) #define roundup(x, y) ((((x) + ((y) - 1)) / (y)) * (y)) +#define rounddown(x, y) ((x) - ((x) % (y))) #define DIV_ROUND_CLOSEST(x, divisor)( \ { \ typeof(divisor) __divisor = divisor; \ -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ |