From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 E15F03603D1 for ; Thu, 2 Apr 2026 08:21:37 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775118098; cv=none; b=G96djhV7GCbAZ18JJoincjOo5DwV+0gb5FKp2CqMpmM72E1e5FUy45+XFhFTc6aBe8oulOhQsWh7K8aIkuyXy61y+M58oAIfSXl5iZMY/H3pS8TnTP08qphphX1BDbTaGDyAbLyoGcQArLgI7RQ+ah1txV0IvNGUgAwV+v13OFI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775118098; c=relaxed/simple; bh=VrXCmY6IVndo65GtVNw4wMeXzy1whTfC5ptBNMljuJ4=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=VEzhzDH6wFL1QDdtaEMWxTxRz4ChL3eS3S091R5icZMHLXVGFX1F1hCyXdGoapuhR7Omn7s59WHiLoalOAZXxMMgAqaUWHGo/QMkdGUZ/UyMigTzuxGasOEaKqMoYuCe3yDhQ/R0/FiOEXUgN1fgCRKo5QrX6P6veu06Vys6jQ8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=W5NFSiQw; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="W5NFSiQw" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5AADEC116C6; Thu, 2 Apr 2026 08:21:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1775118097; bh=VrXCmY6IVndo65GtVNw4wMeXzy1whTfC5ptBNMljuJ4=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=W5NFSiQw0jW17XBbC7g4coFafl6SATWYsNJ6Ui0hS9uvk/OU3uqgLEBRvuw+OOMHZ k9y9uEQzGehRPEs/+7x2xpY6Skyi4nT9y8UxLmuuntlvgNEukLkmAG7CJv8zB9vaJu wQrWCuxNBo0WXxFTtYVbyojhWMnhXFhQqrWTj0QpYSP2AqAGoJhg8qng7dE6WtyJNb kXucPQRtPKBMrRylSOvXLtyAfWC/1MgdRRz1vcTB7c9iojXjFs76fTx22hrYig7G4b 1Qs4ewzUhRDVdJX7h6OO8FMUmiM7LOWuVnOKrhQir+UQwJrVUi2zO2G/8oSjjYpns0 P186mCbj5c5hQ== Message-ID: <3c2f0e52-0271-4bd7-b3d7-84249c40e2fc@kernel.org> Date: Thu, 2 Apr 2026 10:21:30 +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 1/2] mm: huge_memory: use sysfs_match_string() in defrag_store() To: Breno Leitao , Andrew Morton , Lorenzo Stoakes , Zi Yan , Baolin Wang , "Liam R. Howlett" , Nico Pache , Ryan Roberts , Dev Jain , Barry Song , Lance Yang Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, kernel-team@meta.com References: <20260320-thp_defrag-v1-0-6ab15d0d26eb@debian.org> <20260320-thp_defrag-v1-1-6ab15d0d26eb@debian.org> 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: <20260320-thp_defrag-v1-1-6ab15d0d26eb@debian.org> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 3/20/26 17:05, Breno Leitao wrote: > Replace the if/else chain of sysfs_streq() calls in defrag_store() > with sysfs_match_string() and a defrag_mode_strings[] table. > > Introduce enum defrag_mode and defrag_flags[] array mapping each mode > to its corresponding transparent_hugepage_flag. The store function now > loops over defrag_flags[], setting the bit for the selected mode and > clearing the others. When mode is DEFRAG_NEVER (index 4), no index > in the 4-element defrag_flags[] matches, so all flags are cleared. > > Note that the enum ordering (always, defer, defer+madvise, madvise, > never) differs from the original if/else chain order in defrag_store() > (always, defer+madvise, defer, madvise, never). This is intentional to > match the display order used by defrag_show(). > > This is a follow-up cleanup to commit 522dfb4ba71f ("mm: huge_memory: > refactor anon_enabled_store() with change_anon_orders()") which applied > the same sysfs_match_string() pattern to anon_enabled_store(). > > Signed-off-by: Breno Leitao > --- > mm/huge_memory.c | 60 ++++++++++++++++++++++++++++++++------------------------ > 1 file changed, 34 insertions(+), 26 deletions(-) > > diff --git a/mm/huge_memory.c b/mm/huge_memory.c > index 3fc02913b63e3..4843e2154038f 100644 > --- a/mm/huge_memory.c > +++ b/mm/huge_memory.c > @@ -421,6 +421,29 @@ ssize_t single_hugepage_flag_store(struct kobject *kobj, > return count; > } > > +enum defrag_mode { > + DEFRAG_ALWAYS = 0, > + DEFRAG_DEFER = 1, > + DEFRAG_DEFER_MADVISE = 2, > + DEFRAG_MADVISE = 3, > + DEFRAG_NEVER = 4, > +}; These numbers should get assigned as default (C standard) I think, and can be dropped. Acked-by: David Hildenbrand (Arm) -- Cheers, David