linux-kernel - [PATCH] powerpc: vdso: fix building with wrong-endian toolchain

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Date: Fri,  7 Jun 2024 08:16:23 +0200
From: Arnd Bergmann <arnd@...nel.org>
To: Michael Ellerman <mpe@...erman.id.au>
Cc: Masahiro Yamada <masahiroy@...nel.org>,
	Nathan Chancellor <nathan@...nel.org>,
	Nicolas Schier <nicolas@...sle.eu>,
	linux-kbuild@...r.kernel.org,
	Arnd Bergmann <arnd@...db.de>,
	Nicholas Piggin <npiggin@...il.com>,
	Christophe Leroy <christophe.leroy@...roup.eu>,
	"Naveen N. Rao" <naveen.n.rao@...ux.ibm.com>,
	linuxppc-dev@...ts.ozlabs.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] powerpc: vdso: fix building with wrong-endian toolchain

From: Arnd Bergmann <arnd@...db.de>

Building powerpc64le kernels with the kernel.org crosstool toolchains
no longer works as the linker attempts to build a big-endian vdso:

powerpc-linux/lib/gcc/powerpc-linux/12.3.0/../../../../powerpc-linux/bin/ld: arch/powerpc/kernel/vdso/sigtramp32-32.o: compiled for a little endian system and target is big endian
powerpc-linux/lib/gcc/powerpc-linux/12.3.0/../../../../powerpc-linux/bin/ld: failed to merge target specific data of file arch/powerpc/kernel/vdso/sigtramp32-32.o

Apparently creating the vdso.lds files from the lds.S files fails to
pass the -mlittle-endian argument here, so the output format gets set
wrong. Changing the conditional to check for CONFIG_CPU_LITTLE_ENDIAN
instead still works, as the kernel configuration definitions are visible.

Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
I'm fairly sure this worked in the past, but I did not try to bisect the
issue.
---
 arch/powerpc/kernel/vdso/vdso32.lds.S | 2 +-
 arch/powerpc/kernel/vdso/vdso64.lds.S | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/kernel/vdso/vdso32.lds.S b/arch/powerpc/kernel/vdso/vdso32.lds.S
index 426e1ccc6971..5845ea2d1cba 100644
--- a/arch/powerpc/kernel/vdso/vdso32.lds.S
+++ b/arch/powerpc/kernel/vdso/vdso32.lds.S
@@ -7,7 +7,7 @@
 #include <asm/page.h>
 #include <asm-generic/vmlinux.lds.h>
 
-#ifdef __LITTLE_ENDIAN__
+#ifdef CONFIG_CPU_LITTLE_ENDIAN
 OUTPUT_FORMAT("elf32-powerpcle", "elf32-powerpcle", "elf32-powerpcle")
 #else
 OUTPUT_FORMAT("elf32-powerpc", "elf32-powerpc", "elf32-powerpc")
diff --git a/arch/powerpc/kernel/vdso/vdso64.lds.S b/arch/powerpc/kernel/vdso/vdso64.lds.S
index bda6c8cdd459..82c418b18cce 100644
--- a/arch/powerpc/kernel/vdso/vdso64.lds.S
+++ b/arch/powerpc/kernel/vdso/vdso64.lds.S
@@ -7,7 +7,7 @@
 #include <asm/page.h>
 #include <asm-generic/vmlinux.lds.h>
 
-#ifdef __LITTLE_ENDIAN__
+#ifdef CONFIG_CPU_LITTLE_ENDIAN
 OUTPUT_FORMAT("elf64-powerpcle", "elf64-powerpcle", "elf64-powerpcle")
 #else
 OUTPUT_FORMAT("elf64-powerpc", "elf64-powerpc", "elf64-powerpc")
-- 
2.39.2