From: Arun Chandran Date: Thu, 26 Jun 2014 09:46:03 +0000 (+0530) Subject: arm64: vdso: fix build error when switching from LE to BE X-Git-Tag: v3.16.35~2331 X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=8b0caebcc05caf02d88ea24b72d87cb46d6d705e;p=thirdparty%2Fkernel%2Fstable.git arm64: vdso: fix build error when switching from LE to BE commit 1915e2ad1cf548217c963121e4076b3d44dd0169 upstream. Building a kernel with CPU_BIG_ENDIAN fails if there are stale objects from a !CPU_BIG_ENDIAN build. Due to a missing FORCE prerequisite on an if_changed rule in the VDSO Makefile, we attempt to link a stale LE object into the new BE kernel. According to Documentation/kbuild/makefiles.txt, FORCE is required for if_changed rules and forgetting it is a common mistake, so fix it by 'Forcing' the build of vdso. This patch fixes build errors like these: arch/arm64/kernel/vdso/note.o: compiled for a little endian system and target is big endian failed to merge target specific data of file arch/arm64/kernel/vdso/note.o arch/arm64/kernel/vdso/sigreturn.o: compiled for a little endian system and target is big endian failed to merge target specific data of file arch/arm64/kernel/vdso/sigreturn.o Tested-by: Mark Rutland Signed-off-by: Arun Chandran Signed-off-by: Will Deacon Cc: Guenter Roeck Signed-off-by: Luis Henriques --- diff --git a/arch/arm64/kernel/vdso/Makefile b/arch/arm64/kernel/vdso/Makefile index 6d20b7d162d83..a268a9af0c2d8 100644 --- a/arch/arm64/kernel/vdso/Makefile +++ b/arch/arm64/kernel/vdso/Makefile @@ -43,7 +43,7 @@ $(obj)/vdso-offsets.h: $(obj)/vdso.so.dbg FORCE $(call if_changed,vdsosym) # Assembly rules for the .S files -$(obj-vdso): %.o: %.S +$(obj-vdso): %.o: %.S FORCE $(call if_changed_dep,vdsoas) # Actual build commands