linux-kernel - Re: [PATCH 13/13] x86: mm: Convert dump_pagetables to use walk_page

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Date:   Fri, 15 Feb 2019 09:16:37 -0800
From:   Dave Hansen <dave.hansen@...el.com>
To:     Steven Price <steven.price@....com>, linux-mm@...ck.org
Cc:     Andy Lutomirski <luto@...nel.org>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Arnd Bergmann <arnd@...db.de>, Borislav Petkov <bp@...en8.de>,
        Catalin Marinas <catalin.marinas@....com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Ingo Molnar <mingo@...hat.com>,
        James Morse <james.morse@....com>,
        Jérôme Glisse <jglisse@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Will Deacon <will.deacon@....com>, x86@...nel.org,
        "H. Peter Anvin" <hpa@...or.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 13/13] x86: mm: Convert dump_pagetables to use
 walk_page_range

On 2/15/19 9:02 AM, Steven Price wrote:
>  arch/x86/mm/dump_pagetables.c | 281 ++++++++++++++++++----------------
>  1 file changed, 146 insertions(+), 135 deletions(-)

I'll look through this in more detail in a bit.  But, I'm a bit bummed
out by the diffstat.  When I see patches add a bunch of infrastructure,
I *really* hope for code simplification.

Looking at the diff, I think it gets there.  The code you add is
simpler than the code you remove.  But, the diffstat is misleading.

I'd probably address this disparity for each patch in the changelogs.