From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from 013.lax.mailroute.net (013.lax.mailroute.net [199.89.1.16]) (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 2620E3E023F for ; Mon, 23 Mar 2026 20:29:20 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=199.89.1.16 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774297763; cv=none; b=mXRbSq52ELNqVZbvcrjG8Q1SAaoEwjcMyaR78hw6GFuoj7AqVC63rMpv4XQA2vidgWP2yLrTC9MRYF468OgEBBtKB36Z9Pv+7ELrxKL+/qfPms5MTASfD8w8AtEYwg9o+K4SQKBj/tbmd6Kred+MGKXeXk8aWStNvxISAMmUY/o= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774297763; c=relaxed/simple; bh=EilbCy0V7BXkfHkvve+NOPDZterpc1ZVNxlfpXM16XU=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=kpl7m/9UjFuESHKEnzb9DObPOogoKHL7y4cVX07IaorLjWGohgQQ0EbC6PKp0rdviU08jJrUFqcUQENliEVjlXfhJee/Lo2syp8VcFc4XJlkBLK3zS/HqCNIhskAt2DGB/h7jpX/MXPhD1X2f17NSttjlzZvHBd8qVNq/9MUcLg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=acm.org; spf=pass smtp.mailfrom=acm.org; dkim=pass (2048-bit key) header.d=acm.org header.i=@acm.org header.b=Zn5QNMVF; arc=none smtp.client-ip=199.89.1.16 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=acm.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=acm.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=acm.org header.i=@acm.org header.b="Zn5QNMVF" Received: from localhost (localhost [127.0.0.1]) by 013.lax.mailroute.net (Postfix) with ESMTP id 4fflBm3H1hzlfgRx; Mon, 23 Mar 2026 20:29:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=acm.org; h= content-transfer-encoding:mime-version:x-mailer:message-id:date :date:subject:subject:from:from:received:received; s=mr01; t= 1774297758; x=1776889759; bh=grws0aUhj0Wq/LGj1+bA/8M1EjmEHgRh5+Y rpvQUibc=; b=Zn5QNMVF77w2xS8jV5RWL8GvLajKILEDM6avUhKLkqfsVKPmNMa cgYuf7+5ZIWTonUwXDedRi6tcE0SdvS+veOoEtHQpFCYAlzr+SqMYR51QMZrTSI2 egJUyU/nI0SdPnZhu5+sHO5+RHAyql6jadgH2MZYz8mx+cTvDP5A6QjKLTFLKHYb KEnOenDUt4Sym2iEZSCLmxNo2GsgP3t60K2AGrJ/cHDgCg/lEsAxtr1SJC6/9eU/ FlmU0zfZ1yOWHG6NdoTtF6KuQRAxpBc8A7gPHQtfYQeIHS7dfaVEpXIDT2EYP84m 4JGoxDNn25wkfVtFBLx1lbO14nCixa+93eg== X-Virus-Scanned: by MailRoute Received: from 013.lax.mailroute.net ([127.0.0.1]) by localhost (013.lax [127.0.0.1]) (mroute_mailscanner, port 10029) with LMTP id jVedBVg5tWaC; Mon, 23 Mar 2026 20:29:18 +0000 (UTC) Received: from bvanassche.mtv.corp.google.com (unknown [104.135.180.219]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) (Authenticated sender: bvanassche@acm.org) by 013.lax.mailroute.net (Postfix) with ESMTPSA id 4fflBh6xknzlfl5n; Mon, 23 Mar 2026 20:29:16 +0000 (UTC) From: Bart Van Assche To: Jens Axboe Cc: linux-block@vger.kernel.org, Christoph Hellwig , Damien Le Moal , Bart Van Assche Subject: [PATCH 0/2] Enable testing small DMA segment sizes Date: Mon, 23 Mar 2026 13:29:00 -0700 Message-ID: <20260323202904.1248169-1-bvanassche@acm.org> X-Mailer: git-send-email 2.53.0.983.g0bb29b3bc5-goog Precedence: bulk X-Mailing-List: linux-block@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Hi Jens, About one year ago support was merged for DMA segment sizes smaller than = the virtual memory page size. No blktests exist yet for the new codepaths rel= ated to small segment size support. This patch series makes it possible to tes= t these code paths on a system (e.g. a VM) with 4 KiB pages. The corresponding blktest patch is available here: https://lore.kernel.org/linux-block/20260323200751.1238583-1-bvanassche@a= cm.org/ Please consider this patch series for the next merge window. Thanks, Bart. Bart Van Assche (2): block: Reduce BLK_MIN_SEGMENT_SIZE null_blk: Support configuring the maximum segment size block/blk.h | 2 +- drivers/block/null_blk/main.c | 13 +++++++++++++ drivers/block/null_blk/null_blk.h | 1 + 3 files changed, 15 insertions(+), 1 deletion(-)