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From 1d566bf169297faba7afbe59df151ac479b234d5 Mon Sep 17 00:00:00 2001
From: Phil Sutter <phil@nwl.cc>
Date: Fri, 3 Jan 2025 16:30:24 +0100
Subject: [PATCH] Support for cross-compiling kernel modules
In order to correctly cross-compile, one has to pass ARCH and
CROSS_COMPILE make flags to kernel module build calls. Facilitate this
in the same way as for custom CC flag by recognizing KERNEL_-prefixed
configure environment variables of same name.
Signed-off-by: Phil Sutter <phil@nwl.cc>
---
config/kernel.m4 | 5 +++++
module/Makefile.in | 2 ++
2 files changed, 7 insertions(+)
diff --git a/config/kernel.m4 b/config/kernel.m4
index 173c78a2a561a..c0a8355945dce 100644
--- a/config/kernel.m4
+++ b/config/kernel.m4
@@ -663,11 +663,16 @@ AC_DEFUN([ZFS_LINUX_COMPILE], [
building kernel modules])
AC_ARG_VAR([KERNEL_LLVM], [Binary option to
build kernel modules with LLVM/CLANG toolchain])
+ AC_ARG_VAR([KERNEL_CROSS_COMPILE], [Cross compile prefix
+ for kernel module builds])
+ AC_ARG_VAR([KERNEL_ARCH], [Architecture to build kernel modules for])
AC_TRY_COMMAND([
KBUILD_MODPOST_NOFINAL="$5" KBUILD_MODPOST_WARN="$6"
make modules -k -j$TEST_JOBS ${KERNEL_CC:+CC=$KERNEL_CC}
${KERNEL_LD:+LD=$KERNEL_LD} ${KERNEL_LLVM:+LLVM=$KERNEL_LLVM}
CONFIG_MODULES=y CFLAGS_MODULE=-DCONFIG_MODULES
+ ${KERNEL_CROSS_COMPILE:+CROSS_COMPILE=$KERNEL_CROSS_COMPILE}
+ ${KERNEL_ARCH:+ARCH=$KERNEL_ARCH}
-C $LINUX_OBJ $ARCH_UM M=$PWD/$1 >$1/build.log 2>&1])
AS_IF([AC_TRY_COMMAND([$2])], [$3], [$4])
])
diff --git a/module/Makefile.in b/module/Makefile.in
index b6338430e8125..b6e3c8e88ccac 100644
--- a/module/Makefile.in
+++ b/module/Makefile.in
@@ -54,6 +54,8 @@ FMAKE = env -u MAKEFLAGS make $(FMAKEFLAGS)
list='$(SUBDIR_TARGETS)'; for td in $$list; do $(MAKE) -C $$td; done
$(MAKE) -C @LINUX_OBJ@ $(if @KERNEL_CC@,CC=@KERNEL_CC@) \
$(if @KERNEL_LD@,LD=@KERNEL_LD@) $(if @KERNEL_LLVM@,LLVM=@KERNEL_LLVM@) \
+ $(if @KERNEL_CROSS_COMPILE@,CROSS_COMPILE=@KERNEL_CROSS_COMPILE@) \
+ $(if @KERNEL_ARCH@,ARCH=@KERNEL_ARCH@) \
M="$$PWD" @KERNEL_MAKE@ CONFIG_ZFS=m modules
modules-FreeBSD:
--
2.43.0
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