From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail190.messagelabs.com (mail190.messagelabs.com [216.82.249.51]) by kanga.kvack.org (Postfix) with SMTP id B32758D0040 for ; Wed, 23 Mar 2011 11:19:50 -0400 (EDT) From: Stephen Wilson Subject: [PATCH v2 resend 08/12] mm: implement access_remote_vm Date: Wed, 23 Mar 2011 10:43:57 -0400 Message-Id: <1300891441-16280-9-git-send-email-wilsons@start.ca> In-Reply-To: <1300891441-16280-1-git-send-email-wilsons@start.ca> References: <1300891441-16280-1-git-send-email-wilsons@start.ca> Sender: owner-linux-mm@kvack.org List-ID: To: Thomas Gleixner , Ingo Molnar , "H. Peter Anvin" Cc: Andrew Morton , Alexander Viro , Michel Lespinasse , Andi Kleen , Rik van Riel , KOSAKI Motohiro , Matt Mackall , David Rientjes , Nick Piggin , Andrea Arcangeli , Mel Gorman , Hugh Dickins , x86@kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Stephen Wilson 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, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: email@kvack.org