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t=1779961996; bh=nsDtOl3cQ8re9LG+iRAo65uWQwcKMxb80zOtaLHEWdM=; h=From:Date:Subject:References:In-Reply-To:To:Cc; b=UFAb6hliRTB3p+BbANMRHD8BOvyxRcxNLa02dbMyduid7xiapuqLcTzcMu+XIAgJ4 /alyAWeWIgmMLhjbMT7quBrjg6uMKDiXCs2a0ep3tAPT7IIsC5CtnpHyO8yWUx4gVk jK4PCHCm9tZ6XS970c9AEHUrSJFjbrkAb+wNHhrNvRfpvZOTj5eCV4H/WHuSzdsWsD 8WHvUr0q3HjZsj9/LaFfSGY+0pnucT58pHjCmwQlyGaBmIkRzNtZiIwlMBWwg1Ivj+ 5YnTG4uq+55/t6bz1O4JFHuAIFXvvmJochXb7E7Vpi5567mlcy98q8f0nVl7cztVPr m9gNygNDfkcSQ== From: "Mike Rapoport (Microsoft)" Date: Thu, 28 May 2026 12:53:01 +0300 Subject: [PATCH v4 2/2] raid6: use kmalloc() in raid6_select_algo() MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260528-lib-v4-2-4e3ad1277279@kernel.org> References: <20260528-lib-v4-0-4e3ad1277279@kernel.org> In-Reply-To: <20260528-lib-v4-0-4e3ad1277279@kernel.org> To: Andrew Morton Cc: Christoph Hellwig , David Laight , Li Nan , Mike Rapoport , Song Liu , Xiao Ni , Yu Kuai , linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-raid@vger.kernel.org, Christoph Hellwig X-Mailer: b4 0.15.2 X-Rspam-User: X-Rspamd-Queue-Id: 1140E4000D X-Rspamd-Server: rspam03 X-Stat-Signature: 6wrgqo53k9bw69phr6u8hqd61tkdtuoe X-HE-Tag: 1779961996-760038 X-HE-Meta: U2FsdGVkX1+hMiqTUi43WX+TqlKLSY4J7+JLlJUUWT8Ej7J9+029B/hggfAZBJLc0972l++PO6eGsEPFXuFcXp34sn7eMe3paV41IWgjP43cdMxkEx+j57z4AhD68DHGfacdIF3ihXJrRwe5mvTc3Gp6xTpnuKkqxERskxRUlz/ynSyG+w756p4kdw+heDbzb3oU09NVZYhomlfxRnVpU6JeBTiqqQv7J1g0/zEZilPG93y/vsklMxMdW+fD+ZlVc8gI2qBRq53gMZov7gaI15EhZD1ReXBPPTke+T0wkoQwzQ/DcK/6EDLhYXxUX8/n8pKsR+rirLVgFFp9TdSsoNstIksyCFjXZGBp3x/0ptRV7xHMrXCTMhZu9LdfCrgeB1Q2fM7eBB/UXNnFTq+QoxxLiI3K1NtrxG6oypPdguqxStHgyte7+dw6+9DODTaybWvZWZ/RIfOefl8E0tLOLydsTYl+Y7kov2FfRAPrHuauPxkxUZmOwXCIYBg/qGv/53nPW0TheP3yPmDmvlpv2k9/SMnjOzulGraKXmtEnSPklFJoaVogAhKexRd75ODc6l54y8mV76POny60Bn8a/LvaoLsZJ3nnnZIWkVxG0FJp/hvV7nJDL7K0XgF8jkQN6F89OHewImaSH/BCwTd1wE7zAuwYJHvZZl8lM3UAMKAFyQam556Q9N1Eb9oi37fjN3xScsf7auD6mAYNuLeqAhuva2CEahRYPvvcPPIUiyCFqwH6/kQpW9NvCaPIosIwqk2LiKyg1U/eUisNbuYfqGfJnYa1RDkn0NYTyJCiKKvZurw/mj02nzkk3A9mel21QBePMhRVtegJeWDsIYFpOuj9jD+MFfw7SzvneXljV4PAjoJS5YqojlxjjVNDXalPCV7vrHkLXNB9AN3UAYUz3W3/gcmaTX7cbk/VtikzAPRJMxr5gsLvJIP4VtUDmX0qzHKe7nEV9BDQk3nu69n SHc+8m/w 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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: raid6_select_algo() allocates 8 pages for buffer that is used as a scratch area for selection of the best algorithm. This buffer can be allocated with kmalloc() as there's nothing special about it to go directly to the page allocator. kmalloc() provides a better API than ancient __get_free_pages(). kmalloc() does not require ugly casts and kfree() does not need to know the size of the freed object. There is no performance difference because kmalloc() redirects allocations of such size to the page allocator. Replace __get_free_pages() call with kmalloc(). Link: https://lore.kernel.org/all/635405e4-9423-4a25-a6e7-e03c8ea0bcbe@redhat.com Signed-off-by: Mike Rapoport (Microsoft) Reviewed-by: Christoph Hellwig --- lib/raid6/algos.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/lib/raid6/algos.c b/lib/raid6/algos.c index 799e0e5eac26..89e627c62e30 100644 --- a/lib/raid6/algos.c +++ b/lib/raid6/algos.c @@ -12,6 +12,7 @@ */ #include +#include #ifndef __KERNEL__ #include #include @@ -129,7 +130,6 @@ const struct raid6_recov_calls *const raid6_recov_algos[] = { #endif #define RAID6_TEST_DISKS 8 -#define RAID6_TEST_DISKS_ORDER 3 static inline const struct raid6_recov_calls *raid6_choose_recov(void) { @@ -250,7 +250,7 @@ int __init raid6_select_algo(void) int i, cycle; /* prepare the buffer and fill it circularly with gfmul table */ - disk_ptr = (char *)__get_free_pages(GFP_KERNEL, RAID6_TEST_DISKS_ORDER); + disk_ptr = kmalloc(PAGE_SIZE * RAID6_TEST_DISKS, GFP_KERNEL); if (!disk_ptr) { pr_err("raid6: Yikes! No memory available.\n"); return -ENOMEM; @@ -275,7 +275,7 @@ int __init raid6_select_algo(void) /* select raid recover functions */ rec_best = raid6_choose_recov(); - free_pages((unsigned long)disk_ptr, RAID6_TEST_DISKS_ORDER); + kfree(disk_ptr); return gen_best && rec_best ? 0 : -EINVAL; } -- 2.53.0