From: Masahiro Yamada masahiroy@kernel.org
[ Upstream commit c0a8574204054effad6ac83cc75c02576e2985fe ]
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=arm64 Image vmlinuz.efi [ snip ] SORTTAB vmlinux OBJCOPY arch/arm64/boot/Image OBJCOPY arch/arm64/boot/Image AS arch/arm64/boot/zboot-header.o PAD arch/arm64/boot/vmlinux.bin GZIP arch/arm64/boot/vmlinuz OBJCOPY arch/arm64/boot/vmlinuz.o LD arch/arm64/boot/vmlinuz.efi.elf OBJCOPY arch/arm64/boot/vmlinuz.efi
The log "OBJCOPY arch/arm64/boot/Image" is displayed twice.
It indicates that two threads simultaneously enter arch/arm64/boot/ and write to arch/arm64/boot/Image.
It occasionally leads to a build failure:
$ make -j$(nproc) ARCH=arm64 Image vmlinuz.efi [ snip ] SORTTAB vmlinux OBJCOPY arch/arm64/boot/Image PAD arch/arm64/boot/vmlinux.bin truncate: Invalid number: 'arch/arm64/boot/vmlinux.bin' make[2]: *** [drivers/firmware/efi/libstub/Makefile.zboot:13: arch/arm64/boot/vmlinux.bin] Error 1 make[2]: *** Deleting file 'arch/arm64/boot/vmlinux.bin' make[1]: *** [arch/arm64/Makefile:163: vmlinuz.efi] Error 2 make[1]: *** Waiting for unfinished jobs.... make: *** [Makefile:234: __sub-make] Error 2
vmlinuz.efi depends on Image, but such a dependency is not specified in arch/arm64/Makefile.
Signed-off-by: Masahiro Yamada masahiroy@kernel.org Acked-by: Ard Biesheuvel ardb@kernel.org Reviewed-by: SImon Glass sjg@chromium.org Link: https://lore.kernel.org/r/20231119053234.2367621-1-masahiroy@kernel.org Signed-off-by: Catalin Marinas catalin.marinas@arm.com Signed-off-by: Sasha Levin sashal@kernel.org --- arch/arm64/Makefile | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/arm64/Makefile b/arch/arm64/Makefile index 5e56d26a22398..c9496539c3351 100644 --- a/arch/arm64/Makefile +++ b/arch/arm64/Makefile @@ -157,7 +157,7 @@ endif
all: $(notdir $(KBUILD_IMAGE))
- +vmlinuz.efi: Image Image vmlinuz.efi: vmlinux $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@