kmalloc: Use powerof2() to detect power-of-2 size

diff --git a/sys/kern/kern_slaballoc.c b/sys/kern/kern_slaballoc.c
index 9a80068..d23cf8c 100644 (file)
--- a/sys/kern/kern_slaballoc.c
+++ b/sys/kern/kern_slaballoc.c
@@ -828,7 +828,7 @@ kmalloc(unsigned long size, struct malloc_type *type, int flags)
         * Guarentee power-of-2 alignment for power-of-2-sized chunks.
         * Otherwise just 8-byte align the data.
         */
-       if ((size | (size - 1)) + 1 == (size << 1))
+       if (powerof2(size))
            off = (off + size - 1) & ~(size - 1);
        else
            off = (off + align - 1) & ~(align - 1);