Merge branches 'amd-iommu/fixes' and 'dma-debug/fixes' into iommu/fixes

[linux-2.6-block.git] / include / linux / kernel.h

diff --git a/include/linux/kernel.h b/include/linux/kernel.h
index 3fc9f5aab5f8fd5f6deb82d464bf78f72940b40d..328bca609b9bb3d7d7b1f828cdd285de297925e9 100644 (file)
--- a/include/linux/kernel.h
+++ b/include/linux/kernel.h
@@ -734,6 +734,10 @@ struct sysinfo {
 /* Force a compilation error if condition is constant and true */
 #define MAYBE_BUILD_BUG_ON(cond) ((void)sizeof(char[1 - 2 * !!(cond)]))
 
+/* Force a compilation error if a constant expression is not a power of 2 */
+#define BUILD_BUG_ON_NOT_POWER_OF_2(n)                 \
+       BUILD_BUG_ON((n) == 0 || (((n) & ((n) - 1)) != 0))
+
 /* Force a compilation error if condition is true, but also produce a
    result (of value 0 and type size_t), so the expression can be used
    e.g. in a structure initializer (or where-ever else comma expressions