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Date: Wed, 18 Mar 2026 09:38:13 +0200
From: Mike Rapoport <rppt@kernel.org>
To: Pratyush Yadav <pratyush@kernel.org>
Cc: Pasha Tatashin <pasha.tatashin@soleen.com>,
	Shuah Khan <shuah@kernel.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org,
	linux-mm@kvack.org
Subject: Re: [PATCH 5/6] selftests/liveupdate: add test for operations on a
 preserved memfd
Message-ID: <abpWZZWaxUVg1HYd@kernel.org>
References: <20260309115441.266805-1-pratyush@kernel.org>
 <20260309115441.266805-6-pratyush@kernel.org>
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In-Reply-To: <20260309115441.266805-6-pratyush@kernel.org>

On Mon, Mar 09, 2026 at 11:54:38AM +0000, Pratyush Yadav wrote:
> From: "Pratyush Yadav (Google)" <pratyush@kernel.org>
> 
> Once a memfd is preserved, certain operations are not allowed to
> succeed since they might make the state of the memfd inconsistent with
> the serialized state. Among these operations are truncating or growing
> the memfd. Writes and reads to already existing memfd should succeed.
> 
> Add a test that makes sure a preserved memfd does not allow growing or
> shrinking, but does allow reads and writes to existing memory to go
> thorough.
> 
> Signed-off-by: Pratyush Yadav <ptyadav@amazon.de>
> Signed-off-by: Pratyush Yadav (Google) <pratyush@kernel.org>

Reviewed-by: Mike Rapoport (Microsoft) <rppt@kernel.org>

-- 
Sincerely yours,
Mike.