Re: [PATCH 1/8] add lib/gcd.c

[Andrew Morton <akpm@linux-foundation.org>]

On Thu, 4 Jun 2009 16:39:03 +0200
Florian Fainelli <florian@openwrt.org> wrote:

> This patch adds lib/gcd.c which contains a greatest
> common divider implementation taken from
> sound/core/pcm_timer.c
> 
> Changes from v1:
> - fixed indentation
> - use EXPORT_SYMBOL_GPL instead of EXPORT_SYMBOL as
> suggested by Ralf Baechle

I'm not sure about the _GPL change really - it's just a little helper
function.  But whatever - I'm trained to avoid that issue.

I made some changes:

From: Andrew Morton <akpm@linux-foundation.org>

- use swap() (pointed out by Joe)

- Just add gcd.o to lib-y, reove Kconfig changes.

Cc: David S. Miller <davem@davemloft.net>
Cc: Florian Fainelli <florian@openwrt.org>
Cc: Julius Volz <juliusv@google.com>
Cc: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Cc: Simon Horman <horms@verge.net.au>
Cc: Takashi Iwai <tiwai@suse.de>
Cc: Joe Perches <joe@perches.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 lib/Kconfig  |    3 ---
 lib/Makefile |    3 +--
 lib/gcd.c    |    8 +++-----
 3 files changed, 4 insertions(+), 10 deletions(-)

diff -puN lib/Kconfig~lib-add-lib-gcdc-fix lib/Kconfig
--- a/lib/Kconfig~lib-add-lib-gcdc-fix
+++ a/lib/Kconfig
@@ -10,9 +10,6 @@ menu "Library routines"
 config BITREVERSE
        tristate
 
-config GCD
-       bool
-
 config GENERIC_FIND_FIRST_BIT
        bool
 
diff -puN lib/Makefile~lib-add-lib-gcdc-fix lib/Makefile
--- a/lib/Makefile~lib-add-lib-gcdc-fix
+++ a/lib/Makefile
@@ -12,7 +12,7 @@ lib-y := ctype.o string.o vsprintf.o cmd
         idr.o int_sqrt.o extable.o prio_tree.o \
         sha1.o irq_regs.o reciprocal_div.o argv_split.o \
         proportions.o prio_heap.o ratelimit.o show_mem.o \
-        is_single_threaded.o plist.o decompress.o
+        is_single_threaded.o plist.o decompress.o gcd.o
 
 lib-$(CONFIG_MMU) += ioremap.o
 lib-$(CONFIG_SMP) += cpumask.o
@@ -57,7 +57,6 @@ obj-$(CONFIG_CRC_ITU_T)       += crc-itu-t.o
 obj-$(CONFIG_CRC32)    += crc32.o
 obj-$(CONFIG_CRC7)     += crc7.o
 obj-$(CONFIG_LIBCRC32C)        += libcrc32c.o
-obj-$(CONFIG_GCD)      += gcd.o
 obj-$(CONFIG_GENERIC_ALLOCATOR) += genalloc.o
 
 obj-$(CONFIG_ZLIB_INFLATE) += zlib_inflate/
diff -puN lib/gcd.c~lib-add-lib-gcdc-fix lib/gcd.c
--- a/lib/gcd.c~lib-add-lib-gcdc-fix
+++ a/lib/gcd.c
@@ -1,3 +1,4 @@
+#include <linux/kernel.h>
 #include <linux/gcd.h>
 #include <linux/module.h>
 
@@ -6,11 +7,8 @@ unsigned long gcd(unsigned long a, unsig
 {
        unsigned long r;
 
-       if (a < b) {
-               r = a;
-               a = b;
-               b = r;
-       }
+       if (a < b)
+               swap(a, b);
        while ((r = a % b) != 0) {
                a = b;
                b = r;
_