kernel: roundup should only reference arguments once

[net-next-2.6.git] / include / linux / kernel.h

diff --git a/include/linux/kernel.h b/include/linux/kernel.h
index 2b0a35e6bc691896609944c114328b414be37a12..1759ba5adce845fa08d4b1fd899920ac65436938 100644 (file)
--- a/include/linux/kernel.h
+++ b/include/linux/kernel.h
@@ -58,7 +58,18 @@ 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 roundup(x, y) (                                        \
+{                                                      \
+       typeof(y) __y = y;                              \
+       (((x) + (__y - 1)) / __y) * __y;                \
+}                                                      \
+)
+#define rounddown(x, y) (                              \
+{                                                      \
+       typeof(x) __x = (x);                            \
+       __x - (__x % (y));                              \
+}                                                      \
+)
 #define DIV_ROUND_CLOSEST(x, divisor)(                 \
 {                                                      \
        typeof(divisor) __divisor = divisor;            \