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Date: Tue, 06 Mar 2007 02:42:28 -0800
From: akpm@...ux-foundation.org
To: davem@...emloft.net
Cc: netdev@...r.kernel.org, akpm@...ux-foundation.org,
shemminger@...ux-foundation.org, chris@...kel.net,
geert@...ux-m68k.org, jdike@...toit.com, ralf@...ux-mips.org,
rmk@....linux.org.uk, zippel@...ux-m68k.org
Subject: [patch 2/2] div64_64: common code
From: Stephen Hemminger <shemminger@...ux-foundation.org>
Implement div64_64(): 64-bit by 64-bit division. Needed by networking (at
least).
Signed-off-by: Stephen Hemminger <shemminger@...ux-foundation.org>
Cc: Russell King <rmk@....linux.org.uk>
Cc: Geert Uytterhoeven <geert@...ux-m68k.org>
Cc: Roman Zippel <zippel@...ux-m68k.org>
Cc: Ralf Baechle <ralf@...ux-mips.org>
Cc: Chris Zankel <chris@...kel.net>
Cc: Jeff Dike <jdike@...toit.com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
---
include/asm-arm/div64.h | 3 +++
include/asm-generic/div64.h | 7 +++++++
include/asm-i386/div64.h | 4 ++++
include/asm-m68k/div64.h | 3 +++
include/asm-mips/div64.h | 4 ++++
include/asm-um/div64.h | 1 +
include/asm-xtensa/div64.h | 6 ++++++
lib/Makefile | 5 +++--
lib/div64.c | 22 ++++++++++++++++++++++
net/ipv4/tcp_cubic.c | 21 ---------------------
net/netfilter/xt_connbytes.c | 16 ----------------
11 files changed, 53 insertions(+), 39 deletions(-)
diff -puN include/asm-arm/div64.h~div64_64-common-code include/asm-arm/div64.h
--- a/include/asm-arm/div64.h~div64_64-common-code
+++ a/include/asm-arm/div64.h
@@ -2,6 +2,7 @@
#define __ASM_ARM_DIV64
#include <asm/system.h>
+#include <linux/types.h>
/*
* The semantics of do_div() are:
@@ -223,4 +224,6 @@
#endif
+extern uint64_t div64_64(uint64_t dividend, uint64_t divisor);
+
#endif
diff -puN include/asm-generic/div64.h~div64_64-common-code include/asm-generic/div64.h
--- a/include/asm-generic/div64.h~div64_64-common-code
+++ a/include/asm-generic/div64.h
@@ -30,6 +30,11 @@
__rem; \
})
+static inline uint64_t div64_64(uint64_t dividend, uint64_t divisor)
+{
+ return dividend / divisor;
+}
+
#elif BITS_PER_LONG == 32
extern uint32_t __div64_32(uint64_t *dividend, uint32_t divisor);
@@ -49,6 +54,8 @@ extern uint32_t __div64_32(uint64_t *div
__rem; \
})
+extern uint64_t div64_64(uint64_t dividend, uint64_t divisor);
+
#else /* BITS_PER_LONG == ?? */
# error do_div() does not yet support the C64
diff -puN include/asm-i386/div64.h~div64_64-common-code include/asm-i386/div64.h
--- a/include/asm-i386/div64.h~div64_64-common-code
+++ a/include/asm-i386/div64.h
@@ -1,6 +1,8 @@
#ifndef __I386_DIV64
#define __I386_DIV64
+#include <linux/types.h>
+
/*
* do_div() is NOT a C function. It wants to return
* two values (the quotient and the remainder), but
@@ -45,4 +47,6 @@ div_ll_X_l_rem(long long divs, long div,
return dum2;
}
+
+extern uint64_t div64_64(uint64_t dividend, uint64_t divisor);
#endif
diff -puN include/asm-m68k/div64.h~div64_64-common-code include/asm-m68k/div64.h
--- a/include/asm-m68k/div64.h~div64_64-common-code
+++ a/include/asm-m68k/div64.h
@@ -1,6 +1,8 @@
#ifndef _M68K_DIV64_H
#define _M68K_DIV64_H
+#include <linux/types.h>
+
/* n = n / base; return rem; */
#define do_div(n, base) ({ \
@@ -23,4 +25,5 @@
__rem; \
})
+extern uint64_t div64_64(uint64_t dividend, uint64_t divisor);
#endif /* _M68K_DIV64_H */
diff -puN include/asm-mips/div64.h~div64_64-common-code include/asm-mips/div64.h
--- a/include/asm-mips/div64.h~div64_64-common-code
+++ a/include/asm-mips/div64.h
@@ -9,6 +9,8 @@
#ifndef _ASM_DIV64_H
#define _ASM_DIV64_H
+#include <linux/types.h>
+
#if (_MIPS_SZLONG == 32)
#include <asm/compiler.h>
@@ -78,6 +80,8 @@
__quot = __quot << 32 | __low; \
(n) = __quot; \
__mod; })
+
+extern uint64_t div64_64(uint64_t dividend, uint64_t divisor);
#endif /* (_MIPS_SZLONG == 32) */
#if (_MIPS_SZLONG == 64)
diff -puN include/asm-um/div64.h~div64_64-common-code include/asm-um/div64.h
--- a/include/asm-um/div64.h~div64_64-common-code
+++ a/include/asm-um/div64.h
@@ -3,4 +3,5 @@
#include "asm/arch/div64.h"
+extern uint64_t div64_64(uint64_t dividend, uint64_t divisor);
#endif
diff -puN include/asm-xtensa/div64.h~div64_64-common-code include/asm-xtensa/div64.h
--- a/include/asm-xtensa/div64.h~div64_64-common-code
+++ a/include/asm-xtensa/div64.h
@@ -11,9 +11,15 @@
#ifndef _XTENSA_DIV64_H
#define _XTENSA_DIV64_H
+#include <linux/types.h>
+
#define do_div(n,base) ({ \
int __res = n % ((unsigned int) base); \
n /= (unsigned int) base; \
__res; })
+static inline uint64_t div64_64(uint64_t dividend, uint64_t divisor)
+{
+ return dividend / divisor;
+}
#endif
diff -puN lib/Makefile~div64_64-common-code lib/Makefile
--- a/lib/Makefile~div64_64-common-code
+++ a/lib/Makefile
@@ -4,7 +4,7 @@
lib-y := ctype.o string.o vsprintf.o cmdline.o \
rbtree.o radix-tree.o dump_stack.o \
- idr.o div64.o int_sqrt.o bitmap.o extable.o prio_tree.o \
+ idr.o int_sqrt.o bitmap.o extable.o prio_tree.o \
sha1.o irq_regs.o reciprocal_div.o
lib-$(CONFIG_MMU) += ioremap.o
@@ -12,7 +12,8 @@ lib-$(CONFIG_SMP) += cpumask.o
lib-y += kobject.o kref.o kobject_uevent.o klist.o
-obj-y += sort.o parser.o halfmd4.o debug_locks.o random32.o bust_spinlocks.o
+obj-y += div64.o sort.o parser.o halfmd4.o debug_locks.o random32.o \
+ bust_spinlocks.o
ifeq ($(CONFIG_DEBUG_KOBJECT),y)
CFLAGS_kobject.o += -DDEBUG
diff -puN lib/div64.c~div64_64-common-code lib/div64.c
--- a/lib/div64.c~div64_64-common-code
+++ a/lib/div64.c
@@ -58,4 +58,26 @@ uint32_t __div64_32(uint64_t *n, uint32_
EXPORT_SYMBOL(__div64_32);
+/* 64bit divisor, dividend and result. dynamic precision */
+uint64_t div64_64(uint64_t dividend, uint64_t divisor)
+{
+ uint32_t d = divisor;
+
+ if (divisor > 0xffffffffULL) {
+ unsigned int shift = fls(divisor >> 32);
+
+ d = divisor >> shift;
+ dividend >>= shift;
+ }
+
+ /* avoid 64 bit division if possible */
+ if (dividend >> 32)
+ do_div(dividend, d);
+ else
+ dividend = (uint32_t) dividend / d;
+
+ return dividend;
+}
+EXPORT_SYMBOL(div64_64);
+
#endif /* BITS_PER_LONG == 32 */
diff -puN net/ipv4/tcp_cubic.c~div64_64-common-code net/ipv4/tcp_cubic.c
--- a/net/ipv4/tcp_cubic.c~div64_64-common-code
+++ a/net/ipv4/tcp_cubic.c
@@ -93,27 +93,6 @@ static void bictcp_init(struct sock *sk)
tcp_sk(sk)->snd_ssthresh = initial_ssthresh;
}
-/* 64bit divisor, dividend and result. dynamic precision */
-static inline u_int64_t div64_64(u_int64_t dividend, u_int64_t divisor)
-{
- u_int32_t d = divisor;
-
- if (divisor > 0xffffffffULL) {
- unsigned int shift = fls(divisor >> 32);
-
- d = divisor >> shift;
- dividend >>= shift;
- }
-
- /* avoid 64 bit division if possible */
- if (dividend >> 32)
- do_div(dividend, d);
- else
- dividend = (uint32_t) dividend / d;
-
- return dividend;
-}
-
/*
* calculate the cubic root of x using Newton-Raphson
*/
diff -puN net/netfilter/xt_connbytes.c~div64_64-common-code net/netfilter/xt_connbytes.c
--- a/net/netfilter/xt_connbytes.c~div64_64-common-code
+++ a/net/netfilter/xt_connbytes.c
@@ -24,22 +24,6 @@ MODULE_AUTHOR("Harald Welte <laforge@net
MODULE_DESCRIPTION("iptables match for matching number of pkts/bytes per connection");
MODULE_ALIAS("ipt_connbytes");
-/* 64bit divisor, dividend and result. dynamic precision */
-static u_int64_t div64_64(u_int64_t dividend, u_int64_t divisor)
-{
- u_int32_t d = divisor;
-
- if (divisor > 0xffffffffULL) {
- unsigned int shift = fls(divisor >> 32);
-
- d = divisor >> shift;
- dividend >>= shift;
- }
-
- do_div(dividend, d);
- return dividend;
-}
-
static int
match(const struct sk_buff *skb,
const struct net_device *in,
_
-
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