From: Masahiro Yamada masahiroy@kernel.org
[ Upstream commit d3ec75bc635cb0cb8185b63293d33a3d1b942d22 ]
A common issue in Makefile is a race in parallel building.
You need to be careful to prevent multiple threads from writing to the same file simultaneously.
Commit 3939f3345050 ("ARM: 8418/1: add boot image dependencies to not generate invalid images") addressed such a bad scenario.
A similar symptom occurs with the following command:
$ make -j$(nproc) ARCH=loongarch vmlinux.efi vmlinuz.efi [ snip ] SORTTAB vmlinux OBJCOPY arch/loongarch/boot/vmlinux.efi OBJCOPY arch/loongarch/boot/vmlinux.efi PAD arch/loongarch/boot/vmlinux.bin GZIP arch/loongarch/boot/vmlinuz OBJCOPY arch/loongarch/boot/vmlinuz.o LD arch/loongarch/boot/vmlinuz.efi.elf OBJCOPY arch/loongarch/boot/vmlinuz.efi
The log "OBJCOPY arch/loongarch/boot/vmlinux.efi" is displayed twice.
It indicates that two threads simultaneously enter arch/loongarch/boot/ and write to arch/loongarch/boot/vmlinux.efi.
It occasionally leads to a build failure:
$ make -j$(nproc) ARCH=loongarch vmlinux.efi vmlinuz.efi [ snip ] SORTTAB vmlinux OBJCOPY arch/loongarch/boot/vmlinux.efi PAD arch/loongarch/boot/vmlinux.bin truncate: Invalid number: ‘arch/loongarch/boot/vmlinux.bin’ make[2]: *** [drivers/firmware/efi/libstub/Makefile.zboot:13: arch/loongarch/boot/vmlinux.bin] Error 1 make[2]: *** Deleting file 'arch/loongarch/boot/vmlinux.bin' make[1]: *** [arch/loongarch/Makefile:146: vmlinuz.efi] Error 2 make[1]: *** Waiting for unfinished jobs.... make: *** [Makefile:234: __sub-make] Error 2
vmlinuz.efi depends on vmlinux.efi, but such a dependency is not specified in arch/loongarch/Makefile.
Signed-off-by: Masahiro Yamada masahiroy@kernel.org Signed-off-by: Huacai Chen chenhuacai@loongson.cn Signed-off-by: Sasha Levin sashal@kernel.org --- arch/loongarch/Makefile | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/arch/loongarch/Makefile b/arch/loongarch/Makefile index fb0fada43197e..96747bfec1a10 100644 --- a/arch/loongarch/Makefile +++ b/arch/loongarch/Makefile @@ -142,6 +142,8 @@ vdso_install:
all: $(notdir $(KBUILD_IMAGE))
+vmlinuz.efi: vmlinux.efi + vmlinux.elf vmlinux.efi vmlinuz.efi: vmlinux $(Q)$(MAKE) $(build)=$(boot) $(bootvars-y) $(boot)/$@