From 40dd422071b98b49229cf188fa9ddc0c714c8787 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Ming=20Chow=20=E5=91=A8=E6=98=8E?= Date: Thu, 27 Aug 2009 03:17:46 +0000 Subject: linux-nokia800-2.6.21-osso71.bb: Fixed undefined reference to __aeabi_uldivmod * This was a problem when using gcc-4.3 compile linux-nokia800-2.6.21-osso71 Signed-off-by: Ming Zhou Signed-off-by: Khem Raj --- ...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(+) create mode 100644 recipes/linux/linux-nokia800-2.6.21-osso71/1300-fix-gcc-4.3-false-modulo-optimization.patch.patch (limited to 'recipes/linux') 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 0000000000..3ff0c07c18 --- /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 +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 +Signed-off-by: Segher Boessenkool +--- + 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 1ac4cf1468..388df4ff9d 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" -- cgit v1.2.3