As of the 4.13 kernel, there are configuration + linker combinations
that do not need (or build) crtsavres.o for ppc64 targets. The commit
of interest is:
commit efe0160cfd40a99c052a00e174787c1f4158a9cd
Author: Nicholas Piggin <[email protected]>
Date: Fri May 12 01:56:52 2017 +1000
powerpc/64: Linker on-demand sfpr functions for modules
For final link, the powerpc64 linker generates fpr save/restore
functions on-demand, placing them in the .sfpr section. Starting with
binutils 2.25, these can be provided for non-final links with
--save-restore-funcs. Use that where possible for module links.
This saves about 200 bytes per module (~60kB) on powernv defconfig
build.
Signed-off-by: Nicholas Piggin <[email protected]>
Signed-off-by: Michael Ellerman <[email protected]>
As such, our arch test for crtsavres.o is not enough, we add a secondary
existence check before trying the copy.
[YOCTO #12576]
Signed-off-by: Bruce Ashfield <[email protected]>
---
meta/classes/kernel.bbclass | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/meta/classes/kernel.bbclass b/meta/classes/kernel.bbclass
index 321c0a47bb2e..9bc0e4125124 100644
--- a/meta/classes/kernel.bbclass
+++ b/meta/classes/kernel.bbclass
@@ -466,8 +466,10 @@ do_shared_workdir () {
# arch/powerpc/lib/crtsavres.o which is present in
# KBUILD_LDFLAGS_MODULE, making it required to build external modules.
if [ ${ARCH} = "powerpc" ]; then
- mkdir -p $kerneldir/arch/powerpc/lib/
- cp arch/powerpc/lib/crtsavres.o
$kerneldir/arch/powerpc/lib/crtsavres.o
+ if [ -e arch/powerpc/lib/crtsavres.o ]; then
+ mkdir -p $kerneldir/arch/powerpc/lib/
+ cp arch/powerpc/lib/crtsavres.o
$kerneldir/arch/powerpc/lib/crtsavres.o
+ fi
fi
if [ -d include/generated ]; then
--
2.5.0
--
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