Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932242AbbGCOmZ (ORCPT ); Fri, 3 Jul 2015 10:42:25 -0400 Received: from mga01.intel.com ([192.55.52.88]:4234 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754384AbbGCOk5 (ORCPT ); Fri, 3 Jul 2015 10:40:57 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.15,400,1432623600"; d="scan'208";a="757944082" From: Matthew Wilcox To: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, Alexander Viro Cc: Matthew Wilcox Subject: [PATCH v2 2/6] dax: Use copy_from_iter_nocache Date: Fri, 3 Jul 2015 10:40:39 -0400 Message-Id: <1435934443-17090-3-git-send-email-matthew.r.wilcox@intel.com> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1435934443-17090-1-git-send-email-matthew.r.wilcox@intel.com> References: <1435934443-17090-1-git-send-email-matthew.r.wilcox@intel.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 956 Lines: 31 From: Matthew Wilcox When userspace does a write, there's no need for the written data to pollute the CPU cache. This matches the original XIP code. Signed-off-by: Matthew Wilcox --- fs/dax.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fs/dax.c b/fs/dax.c index 99b5fbc..eaa9e06 100644 --- a/fs/dax.c +++ b/fs/dax.c @@ -155,7 +155,7 @@ static ssize_t dax_io(struct inode *inode, struct iov_iter *iter, } if (iov_iter_rw(iter) == WRITE) - len = copy_from_iter(addr, max - pos, iter); + len = copy_from_iter_nocache(addr, max - pos, iter); else if (!hole) len = copy_to_iter(addr, max - pos, iter); else -- 2.1.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/