From 2e2f3c9b864d9f21fb82aa8da5ac9adc1e020f60 Mon Sep 17 00:00:00 2001 From: Naohiro Aota Date: Fri, 12 Jul 2019 19:15:56 +0900 Subject: arm64: vdso: fix flip/flop vdso build bug Running "make" on an already compiled kernel tree will rebuild the kernel even without any modifications: $ make ARCH=arm64 CROSS_COMPILE=/usr/bin/aarch64-unknown-linux-gnu- arch/arm64/Makefile:58: CROSS_COMPILE_COMPAT not defined or empty, the compat vDSO will not be built CALL scripts/checksyscalls.sh CALL scripts/atomic/check-atomics.sh VDSOCHK arch/arm64/kernel/vdso/vdso.so.dbg VDSOSYM include/generated/vdso-offsets.h CHK include/generated/compile.h CC arch/arm64/kernel/signal.o CC arch/arm64/kernel/vdso.o CC arch/arm64/kernel/signal32.o LD arch/arm64/kernel/vdso/vdso.so.dbg OBJCOPY arch/arm64/kernel/vdso/vdso.so AS arch/arm64/kernel/vdso/vdso.o AR arch/arm64/kernel/vdso/built-in.a AR arch/arm64/kernel/built-in.a GEN .version CHK include/generated/compile.h UPD include/generated/compile.h CC init/version.o AR init/built-in.a LD vmlinux.o This is the same bug fixed in commit 92a4728608a8 ("x86/boot: Fix if_changed build flip/flop bug"). We cannot use two "if_changed" in one target. Fix this build bug by merging two commands into one function. Fixes: a7f71a2c8903 ("arm64: compat: Add vDSO") Fixes: 28b1a824a4f4 ("arm64: vdso: Substitute gettimeofday() with C implementation") Reviewed-by: Masahiro Yamada Reviewed-by: Vincenzo Frascino Tested-by: Vincenzo Frascino Co-developed-by: Vincenzo Frascino Signed-off-by: Vincenzo Frascino Signed-off-by: Naohiro Aota [will: merged in compat fix from Vincenzo and made rule names consistent] Signed-off-by: Will Deacon --- arch/arm64/kernel/vdso/Makefile | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) (limited to 'arch/arm64/kernel/vdso/Makefile') diff --git a/arch/arm64/kernel/vdso/Makefile b/arch/arm64/kernel/vdso/Makefile index 4ab863045188..75d25679d879 100644 --- a/arch/arm64/kernel/vdso/Makefile +++ b/arch/arm64/kernel/vdso/Makefile @@ -57,8 +57,7 @@ $(obj)/vdso.o : $(obj)/vdso.so # Link rule for the .so file, .lds has to be first $(obj)/vdso.so.dbg: $(obj)/vdso.lds $(obj-vdso) FORCE - $(call if_changed,ld) - $(call if_changed,vdso_check) + $(call if_changed,vdsold_and_vdso_check) # Strip rule for the .so file $(obj)/%.so: OBJCOPYFLAGS := -S @@ -77,6 +76,9 @@ include/generated/vdso-offsets.h: $(obj)/vdso.so.dbg FORCE quiet_cmd_vdsocc = VDSOCC $@ cmd_vdsocc = $(CC) $(a_flags) $(c_flags) -c -o $@ $< +quiet_cmd_vdsold_and_vdso_check = LD $@ + cmd_vdsold_and_vdso_check = $(cmd_ld); $(cmd_vdso_check) + # Install commands for the unstripped file quiet_cmd_vdso_install = INSTALL $@ cmd_vdso_install = cp $(obj)/$@.dbg $(MODLIB)/vdso/$@ -- cgit