linux-kernel - [PATCH 2/2] kbuild: userprogs: also inherit byte order and ABI from kernel

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Message-Id: <20250813-kbuild-userprogs-bits-v1-2-2d9f7f411083@linutronix.de>
Date: Wed, 13 Aug 2025 07:43:41 +0200
From: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
To: Nathan Chancellor <nathan@...nel.org>, 
 Nicolas Schier <nicolas.schier@...ux.dev>
Cc: linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Masahiro Yamada <masahiroy@...nel.org>, 
 Thomas Weißschuh <thomas.weissschuh@...utronix.de>, 
 Nicolas Schier <nicolas.schier@...ux.dev>
Subject: [PATCH 2/2] kbuild: userprogs: also inherit byte order and ABI
 from kernel

Make sure the byte order and ABI of the userprogs matches the one of the
kernel, similar to how the bit size is handled.
Otherwise the userprogs may not be executable.
This happens for example on powerpc little endian, or riscv32.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
Reviewed-by: Nicolas Schier <n.schier@....de>
Acked-by: Masahiro Yamada <masahiroy@...nel.org>

---
Difference to original series:
* Also handle -EL/-EB for MIPS
---
 Makefile | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/Makefile b/Makefile
index d0f5262a9c0f3b4aa79a91c20cc149d034ffa0b7..7d40f84d5efde18ed3a2f4d8cf7a9b1ec3610ed4 100644
--- a/Makefile
+++ b/Makefile
@@ -1137,8 +1137,8 @@ ifneq ($(CONFIG_ARCH_VMLINUX_NEEDS_RELOCS),)
 LDFLAGS_vmlinux	+= --emit-relocs --discard-none
 endif
 
-# Align the bit size of userspace programs with the kernel
-USERFLAGS_FROM_KERNEL := -m32 -m64 --target=%
+# Align the bit size, byte order and architecture of userspace programs with the kernel
+USERFLAGS_FROM_KERNEL := -m32 -m64 -mlittle-endian -mbig-endian -EL -EB --target=% -march=% -mabi=%
 KBUILD_USERCFLAGS  += $(filter $(USERFLAGS_FROM_KERNEL), $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS))
 KBUILD_USERLDFLAGS += $(filter $(USERFLAGS_FROM_KERNEL), $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS))
 

-- 
2.50.1