From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A4A2F1AB6F1; Fri, 5 Jun 2026 11:35:19 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780659320; cv=none; b=NCWY3WS9r2bD3Nz1Jm/G37gqt/si0Tm0HD6f5cqZs7MP8hnR+EQpFhCV9FiaqxwjhZsPmEjf47UIsmDz3lmeAgVOHVQXKOG9otcPSued89iktqWXXHZD/zAmOM7Tt1rh7yPdFFfIeVT3JkopgiKHFu26OA/n5dZju+uwxDmZvMc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780659320; c=relaxed/simple; bh=U/GhoExoN0LlA/r4cTbbZ/ZPVkMGgXARahm8n7mIjMg=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=moXKVnu8H4gxwTRUeAjbMy0jehM4D79I2Z4HqNweRNJaPi/iHuO7FgSVye7zcjBI+uC+UVV9Gmv9zBWH35gnorv6Vidt06iyMngvE3s/rlbnriR6P2htBZt4UKUQSiCrw3LftvaTGzBsW5xjF7rf2oAIfO71FIi2tkFQy12K+6U= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=CCYLicqX; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="CCYLicqX" Received: by smtp.kernel.org (Postfix) with ESMTPSA id A24BC1F00893; Fri, 5 Jun 2026 11:35:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1780659319; bh=VYwSlTfRiNAfg0kY061d17bvHyd81A79wpzN3UgaPPU=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=CCYLicqX0yVvXA51o3INPCbyOLWqJ3kuKlqsEkwDCzrSsTSZpghUE25hAudi8TcEX BOM0WLwYjoWHYFJkGEne/7igpxlsKjqmC2B9jVkPriF5xkM1boT+1PHxBqg3Dr75kW cd/FWJ1i492m6XRU/0DXAVs6NpqFsYVTPIo3lfWi5QIwA3O7jD/E8nJpst3/F517M+ vbQCiiDF+qOesamEO8bTFvMyRvaGU5z4gvJfvMQgMWfCk1XxEfaX9AKXlENCXxMc1d 4JqzIHo2FVc4UGTRmpgBCl2TCvnQxGMtcwZV0trWrIqsgu0qhnxkWKbvKsK5Juv3zG pcI4qiilLyNoQ== Message-ID: <7c96ba7b-1460-4d62-938a-5051d03609d5@kernel.org> Date: Fri, 5 Jun 2026 13:35:11 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v4 3/7] mm: shmem: Update shmem handler to the MF_DELAYED definition To: Lisa Wang , Miaohe Lin , Naoya Horiguchi , Andrew Morton , Paolo Bonzini , Shuah Khan , Hugh Dickins , Baolin Wang , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , linux-mm@kvack.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, linux-kselftest@vger.kernel.org Cc: rientjes@google.com, seanjc@google.com, ackerleytng@google.com, vannapurve@google.com, michael.roth@amd.com, jiaqiyan@google.com, tabba@google.com, dave.hansen@linux.intel.com References: <20260602-memory-failure-mf-delayed-fix-v4-0-a5bc7db5a9b2@google.com> <20260602-memory-failure-mf-delayed-fix-v4-3-a5bc7db5a9b2@google.com> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; keydata= xsFNBFXLn5EBEAC+zYvAFJxCBY9Tr1xZgcESmxVNI/0ffzE/ZQOiHJl6mGkmA1R7/uUpiCjJ dBrn+lhhOYjjNefFQou6478faXE6o2AhmebqT4KiQoUQFV4R7y1KMEKoSyy8hQaK1umALTdL QZLQMzNE74ap+GDK0wnacPQFpcG1AE9RMq3aeErY5tujekBS32jfC/7AnH7I0v1v1TbbK3Gp XNeiN4QroO+5qaSr0ID2sz5jtBLRb15RMre27E1ImpaIv2Jw8NJgW0k/D1RyKCwaTsgRdwuK Kx/Y91XuSBdz0uOyU/S8kM1+ag0wvsGlpBVxRR/xw/E8M7TEwuCZQArqqTCmkG6HGcXFT0V9 PXFNNgV5jXMQRwU0O/ztJIQqsE5LsUomE//bLwzj9IVsaQpKDqW6TAPjcdBDPLHvriq7kGjt WhVhdl0qEYB8lkBEU7V2Yb+SYhmhpDrti9Fq1EsmhiHSkxJcGREoMK/63r9WLZYI3+4W2rAc UucZa4OT27U5ZISjNg3Ev0rxU5UH2/pT4wJCfxwocmqaRr6UYmrtZmND89X0KigoFD/XSeVv jwBRNjPAubK9/k5NoRrYqztM9W6sJqrH8+UWZ1Idd/DdmogJh0gNC0+N42Za9yBRURfIdKSb B3JfpUqcWwE7vUaYrHG1nw54pLUoPG6sAA7Mehl3nd4pZUALHwARAQABzS5EYXZpZCBIaWxk ZW5icmFuZCAoQ3VycmVudCkgPGRhdmlkQGtlcm5lbC5vcmc+wsGQBBMBCAA6AhsDBQkmWAik AgsJBBUKCQgCFgICHgUCF4AWIQQb2cqtc1xMOkYN/MpN3hD3AP+DWgUCaYJt/AIZAQAKCRBN 3hD3AP+DWriiD/9BLGEKG+N8L2AXhikJg6YmXom9ytRwPqDgpHpVg2xdhopoWdMRXjzOrIKD g4LSnFaKneQD0hZhoArEeamG5tyo32xoRsPwkbpIzL0OKSZ8G6mVbFGpjmyDLQCAxteXCLXz ZI0VbsuJKelYnKcXWOIndOrNRvE5eoOfTt2XfBnAapxMYY2IsV+qaUXlO63GgfIOg8RBaj7x 3NxkI3rV0SHhI4GU9K6jCvGghxeS1QX6L/XI9mfAYaIwGy5B68kF26piAVYv/QZDEVIpo3t7 /fjSpxKT8plJH6rhhR0epy8dWRHk3qT5tk2P85twasdloWtkMZ7FsCJRKWscm1BLpsDn6EQ4 jeMHECiY9kGKKi8dQpv3FRyo2QApZ49NNDbwcR0ZndK0XFo15iH708H5Qja/8TuXCwnPWAcJ DQoNIDFyaxe26Rx3ZwUkRALa3iPcVjE0//TrQ4KnFf+lMBSrS33xDDBfevW9+Dk6IISmDH1R HFq2jpkN+FX/PE8eVhV68B2DsAPZ5rUwyCKUXPTJ/irrCCmAAb5Jpv11S7hUSpqtM/6oVESC 3z/7CzrVtRODzLtNgV4r5EI+wAv/3PgJLlMwgJM90Fb3CB2IgbxhjvmB1WNdvXACVydx55V7 LPPKodSTF29rlnQAf9HLgCphuuSrrPn5VQDaYZl4N/7zc2wcWM7BTQRVy5+RARAA59fefSDR 9nMGCb9LbMX+TFAoIQo/wgP5XPyzLYakO+94GrgfZjfhdaxPXMsl2+o8jhp/hlIzG56taNdt VZtPp3ih1AgbR8rHgXw1xwOpuAd5lE1qNd54ndHuADO9a9A0vPimIes78Hi1/yy+ZEEvRkHk /kDa6F3AtTc1m4rbbOk2fiKzzsE9YXweFjQvl9p+AMw6qd/iC4lUk9g0+FQXNdRs+o4o6Qvy iOQJfGQ4UcBuOy1IrkJrd8qq5jet1fcM2j4QvsW8CLDWZS1L7kZ5gT5EycMKxUWb8LuRjxzZ 3QY1aQH2kkzn6acigU3HLtgFyV1gBNV44ehjgvJpRY2cC8VhanTx0dZ9mj1YKIky5N+C0f21 zvntBqcxV0+3p8MrxRRcgEtDZNav+xAoT3G0W4SahAaUTWXpsZoOecwtxi74CyneQNPTDjNg azHmvpdBVEfj7k3p4dmJp5i0U66Onmf6mMFpArvBRSMOKU9DlAzMi4IvhiNWjKVaIE2Se9BY FdKVAJaZq85P2y20ZBd08ILnKcj7XKZkLU5FkoA0udEBvQ0f9QLNyyy3DZMCQWcwRuj1m73D sq8DEFBdZ5eEkj1dCyx+t/ga6x2rHyc8Sl86oK1tvAkwBNsfKou3v+jP/l14a7DGBvrmlYjO 59o3t6inu6H7pt7OL6u6BQj7DoMAEQEAAcLBfAQYAQgAJgIbDBYhBBvZyq1zXEw6Rg38yk3e EPcA/4NaBQJonNqrBQkmWAihAAoJEE3eEPcA/4NaKtMQALAJ8PzprBEXbXcEXwDKQu+P/vts IfUb1UNMfMV76BicGa5NCZnJNQASDP/+bFg6O3gx5NbhHHPeaWz/VxlOmYHokHodOvtL0WCC 8A5PEP8tOk6029Z+J+xUcMrJClNVFpzVvOpb1lCbhjwAV465Hy+NUSbbUiRxdzNQtLtgZzOV Zw7jxUCs4UUZLQTCuBpFgb15bBxYZ/BL9MbzxPxvfUQIPbnzQMcqtpUs21CMK2PdfCh5c4gS sDci6D5/ZIBw94UQWmGpM/O1ilGXde2ZzzGYl64glmccD8e87OnEgKnH3FbnJnT4iJchtSvx yJNi1+t0+qDti4m88+/9IuPqCKb6Stl+s2dnLtJNrjXBGJtsQG/sRpqsJz5x1/2nPJSRMsx9 5YfqbdrJSOFXDzZ8/r82HgQEtUvlSXNaXCa95ez0UkOG7+bDm2b3s0XahBQeLVCH0mw3RAQg r7xDAYKIrAwfHHmMTnBQDPJwVqxJjVNr7yBic4yfzVWGCGNE4DnOW0vcIeoyhy9vnIa3w1uZ 3iyY2Nsd7JxfKu1PRhCGwXzRw5TlfEsoRI7V9A8isUCoqE2Dzh3FvYHVeX4Us+bRL/oqareJ CIFqgYMyvHj7Q06kTKmauOe4Nf0l0qEkIuIzfoLJ3qr5UyXc2hLtWyT9Ir+lYlX9efqh7mOY qIws/H2t In-Reply-To: <20260602-memory-failure-mf-delayed-fix-v4-3-a5bc7db5a9b2@google.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 6/2/26 23:55, Lisa Wang wrote: > To align with the definition of MF_DELAYED, update > shmem_error_remove_folio() to return MF_DELAYED. > > shmem handles memory failures but defers the actual file truncation. The > function's return value should therefore be MF_DELAYED to accurately > reflect the state. > > Currently, this logical error does not cause a bug, because: > > - For shmem folios, folio->private is not set. > - As a result, filemap_release_folio() is a no-op and returns true. > - This, in turn, causes truncate_error_folio() to incorrectly return > MF_RECOVERED. > - The caller then treats MF_RECOVERED as a success condition, masking the > issue. > > The previous patch relays MF_DELAYED to the caller of > truncate_error_folio() before any logging, so returning MF_DELAYED from > shmem_error_remove_folio() will retain the original behavior of not > adding any logs. > > The return value of truncate_error_folio() is consumed in action_result(), > which treats MF_DELAYED the same way as MF_RECOVERED, hence action_result() > also returns the same thing after this change. > > Signed-off-by: Lisa Wang > --- Acked-by: David Hildenbrand (Arm) -- Cheers, David