Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756925Ab1CIAov (ORCPT ); Tue, 8 Mar 2011 19:44:51 -0500 Received: from mout.perfora.net ([74.208.4.195]:51542 "EHLO mout.perfora.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756210Ab1CIAot (ORCPT ); Tue, 8 Mar 2011 19:44:49 -0500 From: Stephen Wilson To: linux-mm@kvack.org Cc: Andrew Morton , Alexander Viro , Rik van Riel , KOSAKI Motohiro , Roland McGrath , Matt Mackall , David Rientjes , Nick Piggin , Andrea Arcangeli , Mel Gorman , Ingo Molnar , Michel Lespinasse , Hugh Dickins , linux-kernel@vger.kernel.org, Stephen Wilson Subject: [PATCH 3/6] mm: implement access_remote_vm Date: Tue, 8 Mar 2011 19:42:20 -0500 Message-Id: <1299631343-4499-4-git-send-email-wilsons@start.ca> X-Mailer: git-send-email 1.7.3.5 In-Reply-To: <1299631343-4499-1-git-send-email-wilsons@start.ca> References: <1299631343-4499-1-git-send-email-wilsons@start.ca> X-Provags-ID: V02:K0:T11KkO3GGiwtKCtIvUp/+qwJS8Ev3mSJqH/LjlTAnb8 rvVH/fns9WsJgvy26wIgEHF135peSGluf1vlSBQRKnobqInwo2 jXejRHUwIQeH03a7LncFAhKulonMJcNl1DaJkDYvXplr54OlhP 7qqkuhWqUTu4IHNbd7VGS/2zQUn1lMmnftLfVqZzGny2kpUrxj nMm5mcq34NdVS2uDJquccmPhd2lREC/ueKv9IrTC9s= Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2002 Lines: 57 Provide an alternative to access_process_vm that allows the caller to obtain a reference to the supplied mm_struct. Signed-off-by: Stephen Wilson --- include/linux/mm.h | 2 ++ mm/memory.c | 16 ++++++++++++++++ 2 files changed, 18 insertions(+), 0 deletions(-) diff --git a/include/linux/mm.h b/include/linux/mm.h index 694512d..e5fde8a 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -964,6 +964,8 @@ static inline int handle_mm_fault(struct mm_struct *mm, extern int make_pages_present(unsigned long addr, unsigned long end); extern int access_process_vm(struct task_struct *tsk, unsigned long addr, void *buf, int len, int write); +extern int access_remote_vm(struct mm_struct *mm, unsigned long addr, + void *buf, int len, int write); int get_user_pages(struct task_struct *tsk, struct mm_struct *mm, unsigned long start, int nr_pages, int write, int force, diff --git a/mm/memory.c b/mm/memory.c index 68eec4f..c26e4f9 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -3654,6 +3654,22 @@ static int __access_remote_vm(struct task_struct *tsk, struct mm_struct *mm, return buf - old_buf; } +/** + * @access_remote_vm - access another process' address space + * @mm: the mm_struct of the target address space + * @addr: start address to access + * @buf: source or destination buffer + * @len: number of bytes to transfer + * @write: whether the access is a write + * + * The caller must hold a reference on @mm. + */ +int access_remote_vm(struct mm_struct *mm, unsigned long addr, + void *buf, int len, int write) +{ + return __access_remote_vm(NULL, mm, addr, buf, len, write); +} + /* * Access another process' address space. * Source/target buffer must be kernel space, -- 1.7.3.5 -- 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/