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-rw-r--r--src/lib/clog2.c9
1 files changed, 6 insertions, 3 deletions
diff --git a/src/lib/clog2.c b/src/lib/clog2.c
index 41e2af9791..b9b173177c 100644
--- a/src/lib/clog2.c
+++ b/src/lib/clog2.c
@@ -4,16 +4,19 @@
#include <console/console.h>
#endif
+/* Assume 8 bits per byte */
+#define CHAR_BIT 8
+
unsigned long log2(unsigned long x)
{
// assume 8 bits per byte.
- unsigned long i = 1 << (sizeof(x)*8 - 1);
- unsigned long pow = sizeof(x) * 8 - 1;
+ unsigned long i = 1ULL << (sizeof(x)* CHAR_BIT - 1ULL);
+ unsigned long pow = sizeof(x) * CHAR_BIT - 1ULL;
if (! x) {
#ifdef DEBUG_LOG2
printk_warning("%s called with invalid parameter of 0\n",
- __FUNCTION__);
+ __func__);
#endif
return -1;
}