linux-kernel - Re: [PATCH v2] arch: vdso: remove if-conditionals of $(c-gettimeofday-y)

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Mon, 02 Aug 2021 12:36:08 +1000
From:   Michael Ellerman <mpe@...erman.id.au>
To:     Masahiro Yamada <masahiroy@...nel.org>,
        Andy Lutomirski <luto@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        linux-kernel@...r.kernel.org
Cc:     Masahiro Yamada <masahiroy@...nel.org>,
        Will Deacon <will@...nel.org>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Palmer Dabbelt <palmer@...belt.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Guo Ren <guoren@...nel.org>, linux-mips@...r.kernel.org,
        Paul Mackerras <paulus@...ba.org>, linux-csky@...r.kernel.org,
        linux-riscv@...ts.infradead.org, Albert Ou <aou@...s.berkeley.edu>,
        linuxppc-dev@...ts.ozlabs.org,
        Russell King <linux@...linux.org.uk>,
        linux-arm-kernel@...ts.infradead.org,
        Paul Walmsley <paul.walmsley@...ive.com>
Subject: Re: [PATCH v2] arch: vdso: remove if-conditionals of
 $(c-gettimeofday-y)

Masahiro Yamada <masahiroy@...nel.org> writes:
> arm, arm64, csky, mips, powerpc always select GENERIC_GETTIMEOFDAY,
> hence $(gettimeofday-y) never becomes empty.
>
> riscv conditionally selects GENERIC_GETTIMEOFDAY when MMU=y && 64BIT=y,
> but arch/riscv/kernel/vdso/vgettimeofday.o is built only under that
> condition. So, you can always define CFLAGS_vgettimeofday.o
>
> Remove all the meaningless conditionals.
>
> Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>
> ---
>
> Changes in v2:
>   - Fix csky as well
>
>  arch/arm/vdso/Makefile              |  4 ----
>  arch/arm64/kernel/vdso/Makefile     |  5 +----
>  arch/arm64/kernel/vdso32/Makefile   |  3 ---
>  arch/csky/kernel/vdso/Makefile      |  4 +---
>  arch/mips/vdso/Makefile             |  2 --
>  arch/powerpc/kernel/vdso32/Makefile | 14 ++++++--------
>  arch/powerpc/kernel/vdso64/Makefile | 14 ++++++--------

I noticed this the other day and was puzzled why we still needed
the conditional, thanks for cleaning it up.

Acked-by: Michael Ellerman <mpe@...erman.id.au> (powerpc)

cheers