From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mga06.intel.com (mga06.intel.com [134.134.136.31]) (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 ECA2C17E4 for ; Tue, 1 Mar 2022 04:06:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1646107598; x=1677643598; h=date:from:to:cc:subject:message-id:references: mime-version:in-reply-to; bh=wwDVriVDm7UgNSs8eXv3lJSf+SyllYz/XxGrm4fiOYw=; b=YlB+sAUmywGN2lfpmLiY3e6/68ilwZ/TLqkcekjz7TdZ0ypHby8Jftal dQZUV59gIVQUAKkSb7e31plz0pl7V+dgvDBpln3ODobH/dEOJt0sEnq5r Z6OtrsMwk222j0LxFSXl7XNk3hawHeqBnSywO92RaoAlZMpnYi/LqWlLm 8bPbaA9D7x/zATMQeIyMazfqB93tZJbb5DlB8uEalJJiwKjIFew6el7NV 7FVF4uNxIJbw+R12zE2reOB7Z/gxpadSylqVDgT8Ob3VgVBEHu0sXejCi tWVxDq8/PbHO2WRQDwPZrN49Ss08Gx41+HFE5xZmoFfJVGQohe4VEvmo0 g==; X-IronPort-AV: E=McAfee;i="6200,9189,10272"; a="313770842" X-IronPort-AV: E=Sophos;i="5.90,144,1643702400"; d="scan'208";a="313770842" Received: from fmsmga002.fm.intel.com ([10.253.24.26]) by orsmga104.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 28 Feb 2022 20:06:38 -0800 X-IronPort-AV: E=Sophos;i="5.90,144,1643702400"; d="scan'208";a="639228248" Received: from chunhanz-mobl.amr.corp.intel.com (HELO localhost) ([10.212.29.175]) by fmsmga002-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 28 Feb 2022 20:06:37 -0800 Date: Mon, 28 Feb 2022 20:06:37 -0800 From: Ira Weiny To: Christoph Hellwig Cc: Jens Axboe , Chris Zankel , Max Filippov , Justin Sanders , Philipp Reisner , Lars Ellenberg , Denis Efremov , Minchan Kim , Nitin Gupta , Coly Li , Dan Williams , Vishal Verma , linux-xtensa@linux-xtensa.org, linux-block@vger.kernel.org, drbd-dev@lists.linbit.com, linux-bcache@vger.kernel.org, nvdimm@lists.linux.dev Subject: Re: [PATCH 08/10] drbd: use bvec_kmap_local in drbd_csum_bio Message-ID: References: <20220222155156.597597-1-hch@lst.de> <20220222155156.597597-9-hch@lst.de> Precedence: bulk X-Mailing-List: nvdimm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20220222155156.597597-9-hch@lst.de> On Tue, Feb 22, 2022 at 04:51:54PM +0100, Christoph Hellwig wrote: > Using local kmaps slightly reduces the chances to stray writes, and > the bvec interface cleans up the code a little bit. > > Signed-off-by: Christoph Hellwig Reviewed-by: Ira Weiny > --- > drivers/block/drbd/drbd_worker.c | 6 +++--- > 1 file changed, 3 insertions(+), 3 deletions(-) > > diff --git a/drivers/block/drbd/drbd_worker.c b/drivers/block/drbd/drbd_worker.c > index a5e04b38006b6..1b48c8172a077 100644 > --- a/drivers/block/drbd/drbd_worker.c > +++ b/drivers/block/drbd/drbd_worker.c > @@ -326,9 +326,9 @@ void drbd_csum_bio(struct crypto_shash *tfm, struct bio *bio, void *digest) > bio_for_each_segment(bvec, bio, iter) { > u8 *src; > > - src = kmap_atomic(bvec.bv_page); > - crypto_shash_update(desc, src + bvec.bv_offset, bvec.bv_len); > - kunmap_atomic(src); > + src = bvec_kmap_local(&bvec); > + crypto_shash_update(desc, src, bvec.bv_len); > + kunmap_local(src); > > /* REQ_OP_WRITE_SAME has only one segment, > * checksum the payload only once. */ > -- > 2.30.2 > >