linux-kernel - Re: [PATCH v5 2/4] x86/vmemmap: Drop handling of 1GB vmemmap ranges

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Message-ID: <a701a162-d581-42e9-bae5-7c43741bbf7b@intel.com>
Date:   Tue, 9 Mar 2021 10:34:51 -0800
From:   Dave Hansen <dave.hansen@...el.com>
To:     Oscar Salvador <osalvador@...e.de>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     David Hildenbrand <david@...hat.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        x86@...nel.org, "H . Peter Anvin" <hpa@...or.com>,
        Michal Hocko <mhocko@...nel.org>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 2/4] x86/vmemmap: Drop handling of 1GB vmemmap ranges

On 3/9/21 9:41 AM, Oscar Salvador wrote:
> We never get to allocate 1GB pages when mapping the vmemmap range.
> Drop the dead code both for the aligned and unaligned cases and leave
> only the direct map handling.

I was hoping to seem some more meat in this changelog, possibly some of
what David Hildenbrand said in the v4 thread about this patch.
Basically, we don't have code to allocate 1G mappings because it isn't
clear that it would be worth the complexity, and it might also waste memory.

I'm fine with the code, but I would appreciate a beefed-up changelog:

Acked-by: Dave Hansen <dave.hansen@...ux.intel.com>