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* [PATCH] linux-nokia800-2.6.21-osso71.bb fixed undefined reference to __aeabi_uldivmod problem when using gcc-4.3 compile linux-nokia800-2.6.21-osso71
@ 2009-08-20 18:10 Ming Chow 周明
  2009-08-25 13:01 ` Holger Hans Peter Freyther
  0 siblings, 1 reply; 3+ messages in thread
From: Ming Chow 周明 @ 2009-08-20 18:10 UTC (permalink / raw)
  To: openembedded-devel@lists.openembedded.org

 From bc8990dbee051e9f36a2b90761ce1f405f8dabc6 Mon Sep 17 00:00:00 2001
From: Ming Zhou <chow.ming@linuxbj.com>
Date: Fri, 21 Aug 2009 02:04:15 +0800
Subject: [PATCH] linux-nokia800-2.6.21-osso71.bb fixed undefined 
reference to __aeabi_uldivmod problem when using gcc-4.3 compile 
linux-nokia800-2.6.21-osso71


Signed-off-by: Ming Zhou <chow.ming@linuxbj.com>
---
 ...x-gcc-4.3-false-modulo-optimization.patch.patch |   48 
++++++++++++++++++++
 recipes/linux/linux-nokia800_2.6.21-osso71.bb      |    1 +
 2 files changed, 49 insertions(+), 0 deletions(-)
 create mode 100644 
recipes/linux/linux-nokia800-2.6.21-osso71/1300-fix-gcc-4.3-false-modulo-optimization.patch.patch

diff --git 
a/recipes/linux/linux-nokia800-2.6.21-osso71/1300-fix-gcc-4.3-false-modulo-optimization.patch.patch 
b/recipes/linux/linux-nokia800-2.6.21-osso71/1300-fix-gcc-4.3-false-modulo-optimization.patch.patch
new file mode 100644
index 0000000..3ff0c07
--- /dev/null
+++ 
b/recipes/linux/linux-nokia800-2.6.21-osso71/1300-fix-gcc-4.3-false-modulo-optimization.patch.patch
@@ -0,0 +1,48 @@
+From f5b973489beb1a1239dfad53e3ad6e36ff7ee958 Mon Sep 17 00:00:00 2001
+From: Segher Boessenkool <segher@kernel.crashing.org>
+Date: Thu, 9 Oct 2008 21:18:27 +0100
+Subject: [PATCH] fix-gcc-4.3-false-modulo-optimization.patch
+
+I tried to compile the current stable kernel
+(a2ef813d2f439a3e9f377d33a2e5baad098afb7e)
+and get the following errors:
+
+kernel/built-in.o: In function `timespec_add_ns':
+/mnt/data/Freerunner/Gentoo/rootinstall/usr/src/linux/include/linux/time.h:174:
+undefined reference to `__aeabi_uldivmod'
+/mnt/data/Freerunner/Gentoo/rootinstall/usr/src/linux/include/linux/time.h:179:
+undefined reference to `__aeabi_uldivmod'
+/mnt/data/Freerunner/Gentoo/rootinstall/usr/src/linux/include/linux/time.h:174:
+undefined reference to `__aeabi_uldivmod'
+/mnt/data/Freerunner/Gentoo/rootinstall/usr/src/linux/include/linux/time.h:179:
+undefined reference to `__aeabi_uldivmod'
+
+applying the following patch solved the problem:
+--------
+Prevent gcc-4.3 form "optimizing" the while loop into a costly modulo 
operation.
+Patch found at http://lkml.org/lkml/2008/2/22/464.
+
+Reported-by: Sven Rebhan <odinshorse@googlemail.com>
+Signed-off-by: Segher Boessenkool <segher@kernel.crashing.org>
+---
+ include/linux/time.h |    4 ++++
+ 1 files changed, 4 insertions(+), 0 deletions(-)
+
+diff --git a/include/linux/time.h b/include/linux/time.h
+index b04136d..3e8fd9e 100644
+--- a/include/linux/time.h
++++ b/include/linux/time.h
+@@ -173,6 +173,10 @@ static inline void timespec_add_ns(struct timespec 
*a, u64 ns)
+ {
+     ns += a->tv_nsec;
+     while(unlikely(ns >= NSEC_PER_SEC)) {
++        /* The following asm() prevents the compiler from
++         * optimising this loop into a modulo operation.  */
++        asm("" : "+r"(ns));
++
+         ns -= NSEC_PER_SEC;
+         a->tv_sec++;
+     }
+--
+1.5.6.5
+
diff --git a/recipes/linux/linux-nokia800_2.6.21-osso71.bb 
b/recipes/linux/linux-nokia800_2.6.21-osso71.bb
index 1ac4cf1..388df4f 100644
--- a/recipes/linux/linux-nokia800_2.6.21-osso71.bb
+++ b/recipes/linux/linux-nokia800_2.6.21-osso71.bb
@@ -8,6 +8,7 @@ SRC_URI = 
"${KERNELORG_MIRROR}/pub/linux/kernel/v2.6/linux-2.6.21.tar.bz2 \
            
http://www.rpsys.net/openzaurus/patches/archive/input_power-r7.patch;patch=1 
\
        file://suspend-button.patch;patch=1 \
            file://linux-2.6-limits.patch;patch=1 \
+           
file://1300-fix-gcc-4.3-false-modulo-optimization.patch.patch;patch=1 \
        file://defconfig"
 
 S = "${WORKDIR}/linux-2.6.21"
-- 
1.5.4.3




^ permalink raw reply related	[flat|nested] 3+ messages in thread
* Re: [PATCH] linux-nokia800-2.6.21-osso71.bb fixed undefined reference to __aeabi_uldivmod problem when using gcc-4.3 compile linux-nokia800-2.6.21-osso71
  2009-08-20 18:10 [PATCH] linux-nokia800-2.6.21-osso71.bb fixed undefined reference to __aeabi_uldivmod problem when using gcc-4.3 compile linux-nokia800-2.6.21-osso71 Ming Chow 周明
@ 2009-08-25 13:01 ` Holger Hans Peter Freyther
  2009-08-27 13:17   ` Ming Chow 周明
  0 siblings, 1 reply; 3+ messages in thread
From: Holger Hans Peter Freyther @ 2009-08-25 13:01 UTC (permalink / raw)
  To: openembedded-devel

On Thursday 20 August 2009 20:10:42 Ming Chow 周明 wrote:
>  From bc8990dbee051e9f36a2b90761ce1f405f8dabc6 Mon Sep 17 00:00:00 2001
> From: Ming Zhou <chow.ming@linuxbj.com>
> Date: Fri, 21 Aug 2009 02:04:15 +0800
> Subject: [PATCH] linux-nokia800-2.6.21-osso71.bb fixed undefined
> reference to __aeabi_uldivmod problem when using gcc-4.3 compile
> linux-nokia800-2.6.21-osso71


http://patchwork.openembedded.org/patch/975/


Your mailer created a total mess, could you attempt to fix that?



^ permalink raw reply	[flat|nested] 3+ messages in thread
* Re: [PATCH] linux-nokia800-2.6.21-osso71.bb fixed undefined reference to __aeabi_uldivmod problem when using gcc-4.3 compile linux-nokia800-2.6.21-osso71
  2009-08-25 13:01 ` Holger Hans Peter Freyther
@ 2009-08-27 13:17   ` Ming Chow 周明
  0 siblings, 0 replies; 3+ messages in thread
From: Ming Chow 周明 @ 2009-08-27 13:17 UTC (permalink / raw)
  To: openembedded-devel

[-- Attachment #1: Type: text/plain, Size: 810 bytes --]

Sure. Thank you.

Holger Hans Peter Freyther wrote:
> On Thursday 20 August 2009 20:10:42 Ming Chow 周明 wrote:
>   
>>  From bc8990dbee051e9f36a2b90761ce1f405f8dabc6 Mon Sep 17 00:00:00 2001
>> From: Ming Zhou <chow.ming@linuxbj.com>
>> Date: Fri, 21 Aug 2009 02:04:15 +0800
>> Subject: [PATCH] linux-nokia800-2.6.21-osso71.bb fixed undefined
>> reference to __aeabi_uldivmod problem when using gcc-4.3 compile
>> linux-nokia800-2.6.21-osso71
>>     
>
>
> http://patchwork.openembedded.org/patch/975/
>
>
> Your mailer created a total mess, could you attempt to fix that?
>
> _______________________________________________
> Openembedded-devel mailing list
> Openembedded-devel@lists.openembedded.org
> http://lists.linuxtogo.org/cgi-bin/mailman/listinfo/openembedded-devel
>   


[-- Attachment #2: 0001-fixed-undefined-reference-to-__aeabi_uldivmod-proble.patch --]
[-- Type: text/x-patch, Size: 3622 bytes --]

From bc8990dbee051e9f36a2b90761ce1f405f8dabc6 Mon Sep 17 00:00:00 2001
From: Ming Zhou <chow.ming@linuxbj.com>
Date: Fri, 21 Aug 2009 02:04:15 +0800
Subject: [PATCH] linux-nokia800_2.6.21-osso71.bb fixed undefined reference to __aeabi_uldivmod problem when using gcc-4.3 compile linux-nokia800-2.6.21-osso71


Signed-off-by: Ming Zhou <chow.ming@linuxbj.com>
---
 ...x-gcc-4.3-false-modulo-optimization.patch.patch |   48 ++++++++++++++++++++
 recipes/linux/linux-nokia800_2.6.21-osso71.bb      |    1 +
 2 files changed, 49 insertions(+), 0 deletions(-)
 create mode 100644 recipes/linux/linux-nokia800-2.6.21-osso71/1300-fix-gcc-4.3-false-modulo-optimization.patch.patch

diff --git a/recipes/linux/linux-nokia800-2.6.21-osso71/1300-fix-gcc-4.3-false-modulo-optimization.patch.patch b/recipes/linux/linux-nokia800-2.6.21-osso71/1300-fix-gcc-4.3-false-modulo-optimization.patch.patch
new file mode 100644
index 0000000..3ff0c07
--- /dev/null
+++ b/recipes/linux/linux-nokia800-2.6.21-osso71/1300-fix-gcc-4.3-false-modulo-optimization.patch.patch
@@ -0,0 +1,48 @@
+From f5b973489beb1a1239dfad53e3ad6e36ff7ee958 Mon Sep 17 00:00:00 2001
+From: Segher Boessenkool <segher@kernel.crashing.org>
+Date: Thu, 9 Oct 2008 21:18:27 +0100
+Subject: [PATCH] fix-gcc-4.3-false-modulo-optimization.patch
+
+I tried to compile the current stable kernel
+(a2ef813d2f439a3e9f377d33a2e5baad098afb7e)
+and get the following errors:
+
+kernel/built-in.o: In function `timespec_add_ns':
+/mnt/data/Freerunner/Gentoo/rootinstall/usr/src/linux/include/linux/time.h:174:
+undefined reference to `__aeabi_uldivmod'
+/mnt/data/Freerunner/Gentoo/rootinstall/usr/src/linux/include/linux/time.h:179:
+undefined reference to `__aeabi_uldivmod'
+/mnt/data/Freerunner/Gentoo/rootinstall/usr/src/linux/include/linux/time.h:174:
+undefined reference to `__aeabi_uldivmod'
+/mnt/data/Freerunner/Gentoo/rootinstall/usr/src/linux/include/linux/time.h:179:
+undefined reference to `__aeabi_uldivmod'
+
+applying the following patch solved the problem:
+--------
+Prevent gcc-4.3 form "optimizing" the while loop into a costly modulo operation.
+Patch found at http://lkml.org/lkml/2008/2/22/464.
+
+Reported-by: Sven Rebhan <odinshorse@googlemail.com>
+Signed-off-by: Segher Boessenkool <segher@kernel.crashing.org>
+---
+ include/linux/time.h |    4 ++++
+ 1 files changed, 4 insertions(+), 0 deletions(-)
+
+diff --git a/include/linux/time.h b/include/linux/time.h
+index b04136d..3e8fd9e 100644
+--- a/include/linux/time.h
++++ b/include/linux/time.h
+@@ -173,6 +173,10 @@ static inline void timespec_add_ns(struct timespec *a, u64 ns)
+ {
+ 	ns += a->tv_nsec;
+ 	while(unlikely(ns >= NSEC_PER_SEC)) {
++		/* The following asm() prevents the compiler from
++		 * optimising this loop into a modulo operation.  */
++		asm("" : "+r"(ns));
++
+ 		ns -= NSEC_PER_SEC;
+ 		a->tv_sec++;
+ 	}
+-- 
+1.5.6.5
+
diff --git a/recipes/linux/linux-nokia800_2.6.21-osso71.bb b/recipes/linux/linux-nokia800_2.6.21-osso71.bb
index 1ac4cf1..388df4f 100644
--- a/recipes/linux/linux-nokia800_2.6.21-osso71.bb
+++ b/recipes/linux/linux-nokia800_2.6.21-osso71.bb
@@ -8,6 +8,7 @@ SRC_URI = "${KERNELORG_MIRROR}/pub/linux/kernel/v2.6/linux-2.6.21.tar.bz2 \
            http://www.rpsys.net/openzaurus/patches/archive/input_power-r7.patch;patch=1 \
 	   file://suspend-button.patch;patch=1 \
            file://linux-2.6-limits.patch;patch=1 \
+           file://1300-fix-gcc-4.3-false-modulo-optimization.patch.patch;patch=1 \
 	   file://defconfig"
 
 S = "${WORKDIR}/linux-2.6.21"
-- 
1.5.4.3


^ permalink raw reply related	[flat|nested] 3+ messages in thread
end of thread, other threads:[~2009-08-27 13:35 UTC | newest]

Thread overview: 3+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2009-08-20 18:10 [PATCH] linux-nokia800-2.6.21-osso71.bb fixed undefined reference to __aeabi_uldivmod problem when using gcc-4.3 compile linux-nokia800-2.6.21-osso71 Ming Chow 周明
2009-08-25 13:01 ` Holger Hans Peter Freyther
2009-08-27 13:17   ` Ming Chow 周明

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