linux-kernel - Re: [PATCH v4 1/2] kernel/crash_core: separate the parsing routines to lib/parse

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Message-ID: <CAFgQCTso4L+Pxr-uMmCErM9fk4KMDcttcjSNWis9YbBVt-1MLQ@mail.gmail.com>
Date:   Wed, 17 Apr 2019 13:48:36 +0800
From:   Pingfan Liu <kernelfans@...il.com>
To:     Borislav Petkov <bp@...en8.de>
Cc:     x86@...nel.org, Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, Baoquan He <bhe@...hat.com>,
        Will Deacon <will.deacon@....com>,
        Nicolas Pitre <nico@...aro.org>,
        Chao Fan <fanc.fnst@...fujitsu.com>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Vivek Goyal <vgoyal@...hat.com>,
        Hari Bathini <hbathini@...ux.vnet.ibm.com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 1/2] kernel/crash_core: separate the parsing routines
 to lib/parse_crashkernel.c

On Wed, Apr 17, 2019 at 3:01 AM Borislav Petkov <bp@...en8.de> wrote:
>
> On Mon, Apr 08, 2019 at 01:58:34PM +0800, Pingfan Liu wrote:
> > Beside kernel, at early boot stage, the KASLR code also needs to parse the
> > crashkernel=x@y or crashkernel=ramsize-range:size[,...][@offset] option,
> > and avoid to put randomized kernel in the region.
> >
> > Extracting the parsing related routines to lib/parse_crashkernel.c, so it
> > will be handy included by other
> > files.
>
> Use this commit message for your next submission:
>
>     crash: Carve out crashkernel= cmdline parsing
>
>     Make the "crashkernel=" parsing functionality available to the early
>     KASLR code. Will be used by a later patch to parse crashkernel regions
>     which KASLR should aviod.
>
OK.

> > Signed-off-by: Pingfan Liu <kernelfans@...il.com>
> > Cc: Thomas Gleixner <tglx@...utronix.de>
> > Cc: Ingo Molnar <mingo@...hat.com>
> > Cc: Borislav Petkov <bp@...en8.de>
> > Cc: "H. Peter Anvin" <hpa@...or.com>
> > Cc: Baoquan He <bhe@...hat.com>
> > Cc: Will Deacon <will.deacon@....com>
> > Cc: Nicolas Pitre <nico@...aro.org>
> > Cc: Chao Fan <fanc.fnst@...fujitsu.com>
> > Cc: "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
> > Cc: Ard Biesheuvel <ard.biesheuvel@...aro.org>
> > Cc: Vivek Goyal <vgoyal@...hat.com>
> > CC: Hari Bathini <hbathini@...ux.vnet.ibm.com>
> > Cc: linux-kernel@...r.kernel.org
> > ---
> >  kernel/crash_core.c     | 273 ---------------------------------------------
> >  lib/Makefile            |   2 +
> >  lib/parse_crashkernel.c | 289 ++++++++++++++++++++++++++++++++++++++++++++++++
> >  3 files changed, 291 insertions(+), 273 deletions(-)
>
> And this is not how you carve out code.
>
> First, you do a patch which does only code move. Nothing more.
>
> In a follow on patch, you make the changes to the moved code so that it
> is immediately visible what you're changing.
>
Will fix it. Thanks for your review.

Regards,
Pingfan