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authorKumar Gala <galak@kernel.crashing.org>2008-06-12 21:20:58 (GMT)
committerPaul Mackerras <paulus@samba.org>2008-06-16 05:00:54 (GMT)
commitda3de6df33f5f42ff9dc40093fbc884f524c9a49 (patch)
treeb0c5d209cde49e55bdd41b6125ae58918bd31ed5 /arch/powerpc/kernel
parent143580ecfb7999147e546cc3814023e233e95fa5 (diff)
downloadlinux-da3de6df33f5f42ff9dc40093fbc884f524c9a49.tar.xz
[POWERPC] Fix -Os kernel builds with newer gcc versions
GCC 4.4.x looks to be adding support for generating out-of-line register saves/restores based on: http://gcc.gnu.org/ml/gcc-patches/2008-04/msg01678.html This breaks the kernel if we enable CONFIG_CC_OPTIMIZE_FOR_SIZE. To fix this we add the use the save/restore code from gcc and simplified it down for our needs (integer only). Additionally, we have to link this code into each module. The other solution was to add EXPORT_SYMBOL() which meant going through the trampoline which seemed nonsensical for these out-of-line routines. Finally, we add some checks to prom_init_check.sh to ignore the out-of-line save/restore functions. Signed-off-by: Kumar Gala <galak@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch/powerpc/kernel')
-rw-r--r--arch/powerpc/kernel/prom_init_check.sh14
1 files changed, 14 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/prom_init_check.sh b/arch/powerpc/kernel/prom_init_check.sh
index 31729a9..2c7e8e8 100644
--- a/arch/powerpc/kernel/prom_init_check.sh
+++ b/arch/powerpc/kernel/prom_init_check.sh
@@ -48,6 +48,20 @@ do
fi
done
+ # ignore register save/restore funcitons
+ if [ "${UNDEF:0:9}" = "_restgpr_" ]; then
+ OK=1
+ fi
+ if [ "${UNDEF:0:11}" = "_rest32gpr_" ]; then
+ OK=1
+ fi
+ if [ "${UNDEF:0:9}" = "_savegpr_" ]; then
+ OK=1
+ fi
+ if [ "${UNDEF:0:11}" = "_save32gpr_" ]; then
+ OK=1
+ fi
+
if [ $OK -eq 0 ]; then
ERROR=1
echo "Error: External symbol '$UNDEF' referenced" \