From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752870Ab2DWFDH (ORCPT ); Mon, 23 Apr 2012 01:03:07 -0400 Received: from e23smtp08.au.ibm.com ([202.81.31.141]:58540 "EHLO e23smtp08.au.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751703Ab2DWFDF (ORCPT ); Mon, 23 Apr 2012 01:03:05 -0400 Date: Mon, 23 Apr 2012 13:42:43 +0930 From: Christopher Yeoh To: Andrew Morton Cc: linux-kernel@vger.kernel.org Subject: [PATCH] Adds Kconfig option for Cross Memory Attach Message-ID: <20120423134243.5ac73596@Gantu> X-Mailer: Claws Mail 3.7.9 (GTK+ 2.24.6; i686-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit x-cbid: 12042218-5140-0000-0000-0000011E72E7 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Andrew, Attached is a patch which you asked for a while back which adds a Kconfig option to allow people who don't want cross memory attach to not have it included in their build. Regards, Chris -- cyeoh@au.ibm.com Signed-off-by: Chris Yeoh Kconfig | 11 +++++++++++ Makefile | 7 +++++-- 2 files changed, 16 insertions(+), 2 deletions(-) diff --git a/mm/Kconfig b/mm/Kconfig index e338407..7619f90 100644 --- a/mm/Kconfig +++ b/mm/Kconfig @@ -379,3 +379,14 @@ config CLEANCACHE in a negligible performance hit. If unsure, say Y to enable cleancache + +config CROSS_MEMORY_ATTACH + bool "Cross Memory Support" + depends on MMU + default y + help + Enabling this option adds the system calls process_vm_readv and + process_vm_writev which allow a process with the correct privileges + to directly read from or write to to another process's address space. + See the man page for more details. + diff --git a/mm/Makefile b/mm/Makefile index 50ec00e..1ddd00f 100644 --- a/mm/Makefile +++ b/mm/Makefile @@ -5,8 +5,11 @@ mmu-y := nommu.o mmu-$(CONFIG_MMU) := fremap.o highmem.o madvise.o memory.o mincore.o \ mlock.o mmap.o mprotect.o mremap.o msync.o rmap.o \ - vmalloc.o pagewalk.o pgtable-generic.o \ - process_vm_access.o + vmalloc.o pagewalk.o pgtable-generic.o + +ifdef CONFIG_CROSS_MEMORY_ATTACH +mmu-$(CONFIG_MMU) += process_vm_access.o +endif obj-y := filemap.o mempool.o oom_kill.o fadvise.o \ maccess.o page_alloc.o page-writeback.o \