linux-kernel - Re: [PATCH] x86/kexec: prefer _THIS_IP_ to current_text

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Message-ID: <CAKwvOdkWL_2yTnJqM6n6R9UCPwY4iz-9BQYGN2MDAk9EzumUvA@mail.gmail.com>
Date:   Tue, 21 Aug 2018 09:26:24 -0700
From:   Nick Desaulniers <ndesaulniers@...gle.com>
To:     "Eric W . Biederman" <ebiederm@...ssion.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Thomas Gleixner <tglx@...utronix.de>, mingo@...hat.com,
        hpa@...or.com, Simon Horman <horms@...ge.net.au>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Nathan Chancellor <natechancellor@...il.com>, x86@...nel.org,
        Philippe Ombredanne <pombredanne@...b.com>,
        Kate Stewart <kstewart@...uxfoundation.org>,
        Greg KH <gregkh@...uxfoundation.org>,
        LKML <linux-kernel@...r.kernel.org>, kexec@...ts.infradead.org
Subject: Re: [PATCH] x86/kexec: prefer _THIS_IP_ to current_text_addr

On Tue, Aug 21, 2018 at 5:40 AM Eric W. Biederman <ebiederm@...ssion.com> wrote:
>
> Linus Torvalds <torvalds@...ux-foundation.org> writes:
>
> > On Mon, Aug 20, 2018 at 10:58 AM Nick Desaulniers
> > <ndesaulniers@...gle.com> wrote:
> >>
> >> + akpm, Linus
> >>
> >> Bumping for review.
> >
> > Ugh. I am not personally a huge fan of this endless "fix up one at a time".
> >
> > Just do a patch that removes current_text_addr() entirely and be done
> > with it, if that's what we want the end result to be.
> >
> > Don't bother with these small "let's remove the remaining ones one by
> > one". Just get it over and done with.

Linus,
No problem. Will send a V2 that rips off the band-aid.

I explained my thoughts on the process more in
https://lkml.org/lkml/2018/8/1/1689, which akpm agreed with.  I was
hoping that I wouldn't have to bother you with a tree-wide change, but
if code review takes 3 weeks...

Also, I was hoping to save the small but many clean ups as starter
patches for some newbies that we're asking me how to get started
contributing to the kernel, but I can find other good first bugs for
them.

>
> One is generic code the other is assembly but the both appear to do the
> same thing without unexpected complexity.
>
> That said the patch earlier in this thread has clearly never been
> compiled as it is using THIS_IP instead of _THIS_IP_ and there is not
> a define of THIS_IP in the kernel.

Eric,
Please triple check your email client or whatever you're using to
download patches, as I suspect one of them may be stripping
leading+trailing underscores.  That would be quite problematic for
code review or applying patch files.  I've seen some text renderers
treat the underscores as markdown and italicize the contained word.
https://lkml.org/lkml/2018/8/1/1608 shows the underscores.

-- 
Thanks,
~Nick Desaulniers