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@xxxxxxxxxx>
---
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; \
--
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