linux-kernel - Re: [PATCH] x86/vdso: include generic _

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Message-ID: <20190318085916.GH6058@hirez.programming.kicks-ass.net>
Date:   Mon, 18 Mar 2019 09:59:16 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     hpa@...or.com
Cc:     Matthias Kaehlcke <mka@...omium.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Andy Lutomirski <luto@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        x86@...nel.org, LKML <linux-kernel@...r.kernel.org>,
        Manoj Gupta <manojgupta@...omium.org>,
        Tiancong Wang <tcwang@...omium.org>,
        Stephen Hines <srhines@...gle.com>,
        clang-built-linux@...glegroups.com,
        Masahiro Yamada <yamada.masahiro@...ionext.com>
Subject: Re: [PATCH] x86/vdso: include generic __lshrdi3 in 32-bit vDSO

On Fri, Mar 15, 2019 at 04:18:31PM -0700, hpa@...or.com wrote:
> Note: it is also probably no reason to use -Os/-Oz for the vdso.

Is anyone actually using -Os and CONFIG_CC_OPTIMIZE_FOR_SIZE ? I've been
staring at compiler output a lot lately and -Os really generates
atrocious crap.

That is, should we just get rid of it?