linux-kernel - Re: [PATCH 2/2] x86/mm: remove pointless checks in vmalloc

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Message-ID: <1521058054.2693.139.camel@hpe.com>
Date:   Wed, 14 Mar 2018 20:07:37 +0000
From:   "Kani, Toshi" <toshi.kani@....com>
To:     "tglx@...utronix.de" <tglx@...utronix.de>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "gratian.crisan@...com" <gratian.crisan@...com>,
        "x86@...nel.org" <x86@...nel.org>, "hpa@...or.com" <hpa@...or.com>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "luto@...nel.org" <luto@...nel.org>, "bp@...en8.de" <bp@...en8.de>
Subject: Re: [PATCH 2/2] x86/mm: remove pointless checks in vmalloc_fault

On Wed, 2018-03-14 at 20:56 +0100, Thomas Gleixner wrote:
> On Wed, 14 Mar 2018, Kani, Toshi wrote:
> > On Wed, 2018-03-14 at 20:27 +0100, Thomas Gleixner wrote:
> > > On Tue, 13 Mar 2018, Toshi Kani wrote:
> > > 
> > > > vmalloc_fault() sets user's pgd or p4d from the kernel page table.
> > > > Once it's set, all tables underneath are identical. There is no point
> > > > of following the same page table with two separate pointers and makes
> > > > sure they see the same with BUG().
> > > > 
> > > > Remove the pointless checks in vmalloc_fault(). Also rename the kernel
> > > > pgd/p4d pointers to pgd_k/p4d_k so that their names are consistent in
> > > > the file.
> > > 
> > > I have no idea to which branch this might apply. The first patch applies
> > > cleanly on linus head, but this one fails in hunk #2 on everything I
> > > tried. Can you please check?
> > 
> > Sorry for the trouble. The patches are based on linus head. I just tried
> > and they applied clean to me... 
> 
> Hmm. Looks like I tried on the wrong branch. Nevertheless, 1/2 is queued in
> urgent, but 2/2 will go through tip/x86/mm which already has changes in
> that area causing the patch to fail. I just merged x86/urgent into x86/mm
> and pushed it out. Can you please rebase 2/2 on top of that bracnh and
> resend ?

Yes, I will merge up 2/2 and resend.

Thanks,
-Toshi