linux-kernel - Re: [PATCH 16/18] arm64: ptrace: handle ptrace_request differently for aarch32 and ilp32

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Message-ID: <20161206063008.GA18470@yury-N73SV>
Date:   Tue, 6 Dec 2016 12:00:08 +0530
From:   Yury Norov <ynorov@...iumnetworks.com>
To:     Catalin Marinas <catalin.marinas@....com>
CC:     <linux-doc@...r.kernel.org>, <szabolcs.nagy@....com>,
        <heiko.carstens@...ibm.com>, <cmetcalf@...hip.com>,
        <philipp.tomsich@...obroma-systems.com>, <joseph@...esourcery.com>,
        <linux-arch@...r.kernel.org>, <zhouchengming1@...wei.com>,
        <Prasun.Kapoor@...iumnetworks.com>, <agraf@...e.de>,
        <geert@...ux-m68k.org>, <kilobyte@...band.pl>,
        <manuel.montezelo@...il.com>, <arnd@...db.de>, <pinskia@...il.com>,
        <linyongting@...wei.com>, <klimov.linux@...il.com>,
        <broonie@...nel.org>, <bamvor.zhangjian@...wei.com>,
        Bamvor Zhang Jian <bamvor.zhangjian@...aro.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <maxim.kuvyrkov@...aro.org>, <Nathan_Lynch@...tor.com>,
        <linux-kernel@...r.kernel.org>, <schwidefsky@...ibm.com>,
        <davem@...emloft.net>, <christoph.muellner@...obroma-systems.com>
Subject: Re: [PATCH 16/18] arm64: ptrace: handle ptrace_request differently
 for aarch32 and ilp32

On Tue, Dec 06, 2016 at 11:55:08AM +0530, Yury Norov wrote:
> On Mon, Dec 05, 2016 at 04:34:23PM +0000, Catalin Marinas wrote:
> > On Fri, Oct 21, 2016 at 11:33:15PM +0300, Yury Norov wrote:
> > > New aarch32 ptrace syscall handler is introduced to avoid run-time
> > > detection of the task type.
> > 
> > What's wrong with the run-time detection? If it's just to avoid a
> > negligible overhead, I would rather keep the code simpler by avoiding
> > duplicating the generic compat_sys_ptrace().
> 
> Nothing wrong. This is how Arnd asked me to do. You already asked this
> question: http://lkml.iu.edu/hypermail/linux/kernel/1604.3/00930.html
> 
> If it's still looking weird to you, I can switch back to runtime
> ptrace. But I'd like to see Arnd's opinion.
 
 This is the Arnd's email:
 https://patchwork.kernel.org/patch/7980521/

 Yury.