Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754298Ab1CYUb5 (ORCPT ); Fri, 25 Mar 2011 16:31:57 -0400 Received: from smtp.gentoo.org ([140.211.166.183]:59469 "EHLO smtp.gentoo.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751511Ab1CYUb4 (ORCPT ); Fri, 25 Mar 2011 16:31:56 -0400 From: Mike Frysinger To: uclinux-dev@uclinux.org, David Howells , Greg Ungerer , Paul Mundt Cc: uclinux-dist-devel@blackfin.uclinux.org, linux-kernel@vger.kernel.org Subject: [PATCH] NOMMU: implement access_remote_vm Date: Fri, 25 Mar 2011 16:32:28 -0400 Message-Id: <1301085148-14860-1-git-send-email-vapier@gentoo.org> X-Mailer: git-send-email 1.7.4.1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2385 Lines: 88 Recent vm changes brought in a new function which the core procfs code utilizes. So implement it for nommu systems too to avoid link failures. Signed-off-by: Mike Frysinger --- mm/nommu.c | 52 +++++++++++++++++++++++++++++++++++++++------------- 1 files changed, 39 insertions(+), 13 deletions(-) diff --git a/mm/nommu.c b/mm/nommu.c index cb86e7d..c4c542c 100644 --- a/mm/nommu.c +++ b/mm/nommu.c @@ -1971,21 +1971,10 @@ int filemap_fault(struct vm_area_struct *vma, struct vm_fault *vmf) } EXPORT_SYMBOL(filemap_fault); -/* - * Access another process' address space. - * - source/target buffer must be kernel space - */ -int access_process_vm(struct task_struct *tsk, unsigned long addr, void *buf, int len, int write) +static int __access_remote_vm(struct task_struct *tsk, struct mm_struct *mm, + unsigned long addr, void *buf, int len, int write) { struct vm_area_struct *vma; - struct mm_struct *mm; - - if (addr + len < addr) - return 0; - - mm = get_task_mm(tsk); - if (!mm) - return 0; down_read(&mm->mmap_sem); @@ -2010,6 +1999,43 @@ int access_process_vm(struct task_struct *tsk, unsigned long addr, void *buf, in } up_read(&mm->mmap_sem); + + return len; +} + +/** + * @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 + */ +int access_process_vm(struct task_struct *tsk, unsigned long addr, void *buf, int len, int write) +{ + struct mm_struct *mm; + + if (addr + len < addr) + return 0; + + mm = get_task_mm(tsk); + if (!mm) + return 0; + + len = __access_remote_vm(tsk, mm, addr, buf, len, write); + mmput(mm); return len; } -- 1.7.4.1 -- 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/