linux-kernel - [PATCH] kbuild: Add missing $(objtree) prefix to powerpc crtsavres.o artifact

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Message-Id: <20250127-buildfix-extmod-powerpc-v1-1-450012b16263@efficios.com>
Date: Mon, 27 Jan 2025 13:47:21 -0500
From: Kienan Stewart <kstewart@...icios.com>
To: Madhavan Srinivasan <maddy@...ux.ibm.com>, 
 Michael Ellerman <mpe@...erman.id.au>, Nicholas Piggin <npiggin@...il.com>, 
 Christophe Leroy <christophe.leroy@...roup.eu>, 
 Naveen N Rao <naveen@...nel.org>
Cc: linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org, 
 Kienan Stewart <kstewart@...icios.com>
Subject: [PATCH] kbuild: Add missing $(objtree) prefix to powerpc
 crtsavres.o artifact

In the upstream commit 214c0eea43b2ea66bcd6467ea57e47ce8874191b
("kbuild: add $(objtree)/ prefix to some in-kernel build artifacts")
artifacts required for building out-of-tree kernel modules had
$(objtree) prepended to them to prepare for building in other
directories.

When building external modules for powerpc,
arch/powerpc/lib/crtsavres.o is required for certain
configurations. This artifact is missing the prepended $(objtree).

External modules may work around this omission for v6.13 by setting MO=$KDIR.

Signed-off-by: Kienan Stewart <kstewart@...icios.com>
---
 arch/powerpc/Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/powerpc/Makefile b/arch/powerpc/Makefile
index f3804103c56ccfdb16289468397ccaea71bf721e..9933b98df69d7f7b9aaf33d36155cc61ab4460c7 100644
--- a/arch/powerpc/Makefile
+++ b/arch/powerpc/Makefile
@@ -58,7 +58,7 @@ ifeq ($(CONFIG_PPC64)$(CONFIG_LD_IS_BFD),yy)
 # There is a corresponding test in arch/powerpc/lib/Makefile
 KBUILD_LDFLAGS_MODULE += --save-restore-funcs
 else
-KBUILD_LDFLAGS_MODULE += arch/powerpc/lib/crtsavres.o
+KBUILD_LDFLAGS_MODULE += $(objtree)/arch/powerpc/lib/crtsavres.o
 endif
 
 ifdef CONFIG_CPU_LITTLE_ENDIAN

---
base-commit: ffd294d346d185b70e28b1a28abe367bbfe53c04
change-id: 20250127-buildfix-extmod-powerpc-a744e1331f83

Best regards,
-- 
Kienan Stewart <kstewart@...icios.com>