linux-kernel - Re: [PATCH v2 2/2] arm64/vdso: fix flip/flop vdso build bug

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Date:   Fri, 12 Jul 2019 23:55:09 +0900
From:   Masahiro Yamada <yamada.masahiro@...ionext.com>
To:     Naohiro Aota <naohiro.aota@....com>
Cc:     Vincenzo Frascino <vincenzo.frascino@....com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        X86 ML <x86@...nel.org>, Andy Lutomirski <luto@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Peter Collingbourne <pcc@...gle.com>
Subject: Re: [PATCH v2 2/2] arm64/vdso: fix flip/flop vdso build bug

On Fri, Jul 12, 2019 at 7:16 PM Naohiro Aota <naohiro.aota@....com> wrote:
>
> 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.
>
> Cc: Masahiro Yamada <yamada.masahiro@...ionext.com>
> Fixes: 28b1a824a4f4 ("arm64: vdso: Substitute gettimeofday() with C implementation")
> Signed-off-by: Naohiro Aota <naohiro.aota@....com>
> ---

Reviewed-by: Masahiro Yamada <yamada.masahiro@...ionext.com>


-- 
Best Regards
Masahiro Yamada