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Wed, 17 Sep 2025 18:50:37 -0700 (PDT) X-Relaying-Domain: purestorage.com Received: from dev-csander.dev.purestorage.com (dev-csander.dev.purestorage.com [10.7.70.37]) by c7-smtp-2023.dev.purestorage.com (Postfix) with ESMTP id 1E83E340508; Wed, 17 Sep 2025 19:50:37 -0600 (MDT) Received: by dev-csander.dev.purestorage.com (Postfix, from userid 1557716354) id 17A29E41B42; Wed, 17 Sep 2025 19:50:37 -0600 (MDT) From: Caleb Sander Mateos To: Ming Lei , Jens Axboe Cc: linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, Caleb Sander Mateos Subject: [PATCH 08/17] ublk: don't access ublk_queue in ublk_register_io_buf() Date: Wed, 17 Sep 2025 19:49:44 -0600 Message-ID: <20250918014953.297897-9-csander@purestorage.com> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20250918014953.297897-1-csander@purestorage.com> References: <20250918014953.297897-1-csander@purestorage.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" For ublk servers with many ublk queues, accessing the ublk_queue in ublk_register_io_buf() is a frequent cache miss. Get the flags from the ublk_device instead, which is accessed earlier in ublk_ch_uring_cmd_local(). Signed-off-by: Caleb Sander Mateos --- drivers/block/ublk_drv.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/block/ublk_drv.c b/drivers/block/ublk_drv.c index cb51f3f3cd33..751ec62655f8 100644 --- a/drivers/block/ublk_drv.c +++ b/drivers/block/ublk_drv.c @@ -2131,11 +2131,11 @@ static int ublk_register_io_buf(struct io_uring_cmd= *cmd, unsigned int index, unsigned int issue_flags) { struct request *req; int ret; =20 - if (!ublk_support_zero_copy(ubq)) + if (!ublk_dev_support_zero_copy(ub)) return -EINVAL; =20 req =3D __ublk_check_and_get_req(ub, ubq, io, 0); if (!req) return -EINVAL; --=20 2.45.2