introduce explicit signed/unsigned 64bit divide

[linux-block.git] / lib / div64.c

diff --git a/lib/div64.c b/lib/div64.c
index b71cf93c529adaa3364afa4a1b997c54cc9ef363..689bd76833faf4ae7eed39efc50bc52d766f5135 100644 (file)
--- a/lib/div64.c
+++ b/lib/div64.c
@@ -16,9 +16,8 @@
  * assembly versions such as arch/ppc/lib/div64.S and arch/sh/lib/div64.S.
  */
 
-#include <linux/types.h>
 #include <linux/module.h>
-#include <asm/div64.h>
+#include <linux/math64.h>
 
 /* Not needed on 64bit architectures */
 #if BITS_PER_LONG == 32
@@ -58,6 +57,26 @@ uint32_t __attribute__((weak)) __div64_32(uint64_t *n, uint32_t base)
 
 EXPORT_SYMBOL(__div64_32);
 
+#ifndef div_s64_rem
+s64 div_s64_rem(s64 dividend, s32 divisor, s32 *remainder)
+{
+       u64 quotient;
+
+       if (dividend < 0) {
+               quotient = div_u64_rem(-dividend, abs(divisor), (u32 *)remainder);
+               *remainder = -*remainder;
+               if (divisor > 0)
+                       quotient = -quotient;
+       } else {
+               quotient = div_u64_rem(dividend, abs(divisor), (u32 *)remainder);
+               if (divisor < 0)
+                       quotient = -quotient;
+       }
+       return quotient;
+}
+EXPORT_SYMBOL(div_s64_rem);
+#endif
+
 /* 64bit divisor, dividend and result. dynamic precision */
 uint64_t div64_64(uint64_t dividend, uint64_t divisor)
 {