From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Dave Jiang , Dan Williams Subject: [PATCH 4.16 191/196] device-dax: allow MAP_SYNC to succeed Date: Sun, 22 Apr 2018 15:53:31 +0200 Message-Id: <20180422135114.135122549@linuxfoundation.org> In-Reply-To: <20180422135104.278511750@linuxfoundation.org> References: <20180422135104.278511750@linuxfoundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: 4.16-stable review patch. If anyone has any objections, please let me know. ------------------ From: Dave Jiang commit ef8423022324cf79bd1b41d8707c766461e7e555 upstream. MAP_SYNC is a nop for device-dax. Allow MAP_SYNC to succeed on device-dax to eliminate special casing between device-dax and fs-dax as to when the flag can be specified. Device-dax users already implicitly assume that they do not need to call fsync(), and this enables them to explicitly check for this capability. Cc: Fixes: b6fb293f2497 ("mm: Define MAP_SYNC and VM_SYNC flags") Signed-off-by: Dave Jiang Reviewed-by: Dan Williams Signed-off-by: Dan Williams Signed-off-by: Greg Kroah-Hartman --- drivers/dax/device.c | 2 ++ 1 file changed, 2 insertions(+) --- a/drivers/dax/device.c +++ b/drivers/dax/device.c @@ -19,6 +19,7 @@ #include #include #include +#include #include "dax-private.h" #include "dax.h" @@ -534,6 +535,7 @@ static const struct file_operations dax_ .release = dax_release, .get_unmapped_area = dax_get_unmapped_area, .mmap = dax_mmap, + .mmap_supported_flags = MAP_SYNC, }; static void dev_dax_release(struct device *dev)