linux-kernel - Re: [PATCH v2 1/3] selftests/mm: virtual_address_range: mmap() without PROT

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Message-ID: <9ed49333-b5fc-40c9-a8e4-fb3fc4af9089@arm.com>
Date: Fri, 10 Jan 2025 21:17:01 +0530
From: Dev Jain <dev.jain@....com>
To: Thomas Weißschuh <thomas.weissschuh@...utronix.de>,
 Andrew Morton <akpm@...ux-foundation.org>, Shuah Khan <shuah@...nel.org>,
 Thomas Gleixner <tglx@...utronix.de>, David Hildenbrand <david@...hat.com>,
 Ryan Roberts <ryan.roberts@....com>
Cc: linux-mm@...ck.org, linux-kselftest@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/3] selftests/mm: virtual_address_range: mmap()
 without PROT_WRITE



On 10/01/25 6:35 pm, Thomas Weißschuh wrote:
> When mapping a larger chunk than physical memory is available with
> PROT_WRITE and overcommit is disabled, the mapping will fail.
> This will prevent the test from running on systems with less then ~1GiB
> of memory and triggering an inscrutinable test failure.
> As the mappings are never written to anyways, the flag can be removed.
> 
> Fixes: 010409649885 ("selftests/mm: confirm VA exhaustion without reliance on correctness of mmap()")
> Signed-off-by: Thomas Weißschuh <thomas.weissschuh@...utronix.de>

Thanks! FWIW:

Acked-by: Dev Jain <dev.jain@....com>