linux-kernel - Re: [PATCH v2 2/2] efi: efi_mem_reserve(): don't reserve through memblock after mm

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Message-ID: <20170109134502.GK16838@codeblueprint.co.uk>
Date:   Mon, 9 Jan 2017 13:45:02 +0000
From:   Matt Fleming <matt@...eblueprint.co.uk>
To:     Mel Gorman <mgorman@...hsingularity.net>
Cc:     Dave Young <dyoung@...hat.com>,
        Nicolai Stange <nicstange@...il.com>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        linux-efi@...r.kernel.org, linux-kernel@...r.kernel.org,
        Mika Penttilä <mika.penttila@...tfour.com>,
        Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        Vlastimil Babka <vbabka@...e.cz>, Michal Hocko <mhocko@...e.cz>
Subject: Re: [PATCH v2 2/2] efi: efi_mem_reserve(): don't reserve through
 memblock after mm_init()

On Mon, 09 Jan, at 01:31:52PM, Mel Gorman wrote:
> 
> Well, you could put in a __init global variable about availability into
> mm/memblock.c and then check it in memblock APIs like memblock_reserve()
> to BUG_ON? I know BUG_ON is frowned upon but this is not likely to be a
> situation that can be sensibly recovered.

Indeed. I've only ever seen this situation lead to silent memory
corruption and bitter tears.