linux-kernel - Re: [PATCH v2 1/3] x86/vmemmap: Drop handling of 4K unaligned vmemmap range

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Message-ID: <20210211212517.GA2872@localhost.localdomain>
Date:   Thu, 11 Feb 2021 22:25:17 +0100
From:   Oscar Salvador <osalvador@...e.de>
To:     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 v2 1/3] x86/vmemmap: Drop handling of 4K unaligned
 vmemmap range

On Wed, Feb 03, 2021 at 11:47:48AM +0100, Oscar Salvador wrote:
> remove_pte_table() is prepared to handle the case where either the
> start or the end of the range is not PAGE aligned.
> This cannot actually happen:
> 
> __populate_section_memmap enforces the range to be PMD aligned,
> so as long as the size of the struct page remains multiple of 8,
> the vmemmap range will be aligned to PAGE_SIZE.
> 
> Drop the dead code and place a VM_BUG_ON in vmemmap_{populate,free}
> to catch nasty cases.
> 
> Signed-off-by: Oscar Salvador <osalvador@...e.de>
> Suggested-by: David Hildenbrand <david@...hat.com>

Hi Andrew, 

the cover letter got lost somehow, but is this patchset, [1] and [2]
on your radar?

[1] https://lore.kernel.org/linux-mm/20210204134325.7237-3-osalvador@suse.de/
[2] https://lore.kernel.org/linux-mm/20210204134325.7237-4-osalvador@suse.de/

thanks


-- 
Oscar Salvador
SUSE L3