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t=1779799850; bh=gG3agpilQ4MpstT87zE1nTk6qyo1jydMxmD6GEu/XHw=; h=From:Date:Subject:References:In-Reply-To:To:Cc; b=kzRvk5e2BuxIoYvQBIBHk0zrhimZ69ezYEbWKQnDRvl+hWoHZlCvC1utbNfSVFlDg g+gt5jlLpowccZktUJNPftQgbnlbbYSrRqSxf4BHHILI2oSn5goR7MuohL6wIqpngL /uDAi9axGu4c4o92x8enOa6G028OeH1L8T1pxnWiHD9Yn3lzuKREi/sp1xo2BuSxFL M/UBFB0KeVeioL7xSQeU290fo4vNvp23LGZjEELBmWydJuc+Kn2zwZsaH9UjvVlw6l AiaN5Rpd2gAiV+mGetKbZwGx6Bxi1PNhxwienG7NUc7I+FMAG1ktlZq/qwPMvFiY+g XKIZeEkADdl2w== From: "Mike Rapoport (Microsoft)" Date: Tue, 26 May 2026 15:50:39 +0300 Subject: [PATCH v2 2/2] lib/raid6: use kvmalloc() in raid6_select_algo() MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260526-lib-v2-2-ca3f0fc24b14@kernel.org> References: <20260526-lib-v2-0-ca3f0fc24b14@kernel.org> In-Reply-To: <20260526-lib-v2-0-ca3f0fc24b14@kernel.org> To: Andrew Morton , Song Liu , Yu Kuai , Li Nan , Xiao Ni Cc: David Laight , Mike Rapoport , linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-raid@vger.kernel.org X-Mailer: b4 0.15.2 X-Rspam-User: X-Rspamd-Queue-Id: 2BFCE100009 X-Rspamd-Server: rspam03 X-Stat-Signature: hrcn64htaiyhwczwsf33xis3ffc8m64y X-HE-Tag: 1779799850-964192 X-HE-Meta: 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 3d34i4hI 61LzRrxKOnX8CDQcdb09IEVayWehbqJH+oS5VggTeAYl8+SQyuFaNKaZx7b7A5Yksk7Aby3iUjPfeX63NsQUolKnAxNid3AB7IhPyRieY2ql2FZuh17A+Kgn0umGZ1l8QN7wcuctVkMYe1jsPhT8h2m+edT4dHRd/Tdm5Bk1KGrpHh8AP1W9QkRZo2P/rjP1HepLU+o8394nm0mIAaUIkbS0/D3uBOMpN8NLLdlCk5QNdATTcDQaFB9Akt8dT/EYVLdRKvCdUeRtogtc6vN0XGjIUmvSbqvJ/o348Vgq/pGLBuL1TgnosqU+3NxJQjij7GxCm/WKw9AhXMQSLa9/msO05nrXfasy0j5+PVVlUJ2Dh+Wm2n7A/7LrDEYmukSnd29x1 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: raid6_select_algo() allocates an order 3 (8 pages) buffer that is used as a scratch area for selection of the best algorithm. This buffer does not need to be physically contiguous and can be allocated with kvmalloc(). Replace __get_free_pages() call with kvmalloc(). Link: https://lore.kernel.org/all/635405e4-9423-4a25-a6e7-e03c8ea0bcbe@redhat.com Signed-off-by: Mike Rapoport (Microsoft) --- 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..1f565c3b63ce 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 = kvmalloc(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); + kvfree(disk_ptr); return gen_best && rec_best ? 0 : -EINVAL; } -- 2.53.0