Hi,
I would actually prefer to introduce an explicit API for signed 64
divides to get rid of the temps completely, something like below.
Right now it uses do_div as fallback. When all archs are converted, do_div
can be single compatibility define and perhaps we can get rid of it
completely.
Bonus feature: implement the x86 version without the asm casts allowing
gcc to generate better code.
bye, Roman
---
include/asm-generic/div64.h | 14 ++++++++++++++
include/asm-i386/div64.h | 20 ++++++++++++++++++++
include/linux/calc64.h | 28 ++++++++++++++++++++++++++++
kernel/time.c | 26 +++++++-------------------
kernel/time/ntp.c | 21 +++++----------------
lib/div64.c | 21 ++++++++++++++++++++-
6 files changed, 94 insertions(+), 36 deletions(-)
Index: linux-2.6/include/asm-generic/div64.h
===================================================================
--- linux-2.6.orig/include/asm-generic/div64.h
+++ linux-2.6/include/asm-generic/div64.h
@@ -35,6 +35,20 @@ static inline uint64_t div64_64(uint64_t
return dividend / divisor;
}
+static inline u64 div_u64_rem(u64 dividend, u32 divisor, u32 *remainder)
+{
+ *remainder = dividend % divisor;
+ return dividend / divisor;
+}
+#define div_u64_rem div_u64_rem
+
+static inline s64 div_s64_rem(s64 dividend, s32 divisor, s32 *remainder)
+{
+ *remainder = dividend % divisor;
+ return dividend / divisor;
+}
+#define div_s64_rem div_s64_rem
+
#elif BITS_PER_LONG == 32
extern uint32_t __div64_32(uint64_t *dividend, uint32_t divisor);
Index: linux-2.6/include/asm-i386/div64.h
===================================================================
--- linux-2.6.orig/include/asm-i386/div64.h
+++ linux-2.6/include/asm-i386/div64.h
@@ -48,5 +48,25 @@ div_ll_X_l_rem(long long divs, long div,
}
+static inline u64 div_u64_rem(u64 dividend, u32 divisor, u32 *remainder)
+{
+ union {
+ u64 v64;
+ u32 v32[2];
+ } d = { dividend };
+ u32 upper;
+
+ up...
