5.15-stable review patch. If anyone has any objections, please let me know.
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From: "Thomas Wei�schuh" thomas.weissschuh@linutronix.de
commit dfc1b168a8c4b376fa222b27b97c2c4ad4b786e1 upstream.
The userprog infrastructure links objects files through $(CC). Either explicitly by manually calling $(CC) on multiple object files or implicitly by directly compiling a source file to an executable. The documentation at Documentation/kbuild/llvm.rst indicates that ld.lld would be used for linking if LLVM=1 is specified. However clang instead will use either a globally installed cross linker from $PATH called ${target}-ld or fall back to the system linker, which probably does not support crosslinking. For the normal kernel build this is not an issue because the linker is always executed directly, without the compiler being involved.
Explicitly pass --ld-path to clang so $(LD) is respected. As clang 13.0.1 is required to build the kernel, this option is available.
Fixes: 7f3a59db274c ("kbuild: add infrastructure to build userspace programs") Cc: stable@vger.kernel.org # needs wrapping in $(cc-option) for < 6.9 Signed-off-by: Thomas Weißschuh thomas.weissschuh@linutronix.de Reviewed-by: Nathan Chancellor nathan@kernel.org Signed-off-by: Masahiro Yamada masahiroy@kernel.org [nathan: use cc-option for 6.6 and older, as those trees support back to clang-11] Signed-off-by: Nathan Chancellor nathan@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- Makefile | 5 +++++ 1 file changed, 5 insertions(+)
--- a/Makefile +++ b/Makefile @@ -1114,6 +1114,11 @@ endif KBUILD_USERCFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
+# userspace programs are linked via the compiler, use the correct linker +ifeq ($(CONFIG_CC_IS_CLANG)$(CONFIG_LD_IS_LLD),yy) +KBUILD_USERLDFLAGS += $(call cc-option, --ld-path=$(LD)) +endif + # make the checker run with the right architecture CHECKFLAGS += --arch=$(ARCH)