linux-kernel - Re: [PATCH] mm: Optimizing error condition detection in do_mprotect

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Date:   Thu, 21 Jan 2021 14:46:27 -0800
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Jarkko Sakkinen <jarkko@...nel.org>
Cc:     Tianjia Zhang <tianjia.zhang@...ux.alibaba.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>, Shuah Khan <shuah@...nel.org>,
        haitao.huang@...el.com, Kai Huang <kai.huang@...el.com>,
        x86@...nel.org, linux-sgx@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        linux-kselftest@...r.kernel.org,
        Jia Zhang <zhang.jia@...ux.alibaba.com>
Subject: Re: [PATCH] mm: Optimizing error condition detection in
 do_mprotect_pkey()

On Wed, 20 Jan 2021 16:29:20 +0200 Jarkko Sakkinen <jarkko@...nel.org> wrote:

> 
> 
> On Mon, Jan 18, 2021 at 09:33:10PM +0800, Tianjia Zhang wrote:
> > Obviously, the error variable detection of the if statement is
> > for the mprotect callback function, so it is also put into the
> > scope of calling callbck.
> > 
> > Reported-by: Jia Zhang <zhang.jia@...ux.alibaba.com>
> > Signed-off-by: Tianjia Zhang <tianjia.zhang@...ux.alibaba.com>
> 
> No fixes tag, no description what this commit does. Nothing
> makes sense to me.

It's a little cleanup.  Makes the flow at this site consistent with the
other places where this function handles errors.  I added a bit to the
changelog mentioning this.