Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759498Ab3CZMEs (ORCPT ); Tue, 26 Mar 2013 08:04:48 -0400 Received: from e39.co.us.ibm.com ([32.97.110.160]:49824 "EHLO e39.co.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757082Ab3CZMEr (ORCPT ); Tue, 26 Mar 2013 08:04:47 -0400 Date: Tue, 26 Mar 2013 17:29:35 +0530 From: Srikar Dronamraju To: Oleg Nesterov Cc: Anton Arapov , LKML , Josh Stone , Frank Eigler , Peter Zijlstra , Ingo Molnar , Ananth N Mavinakayanahalli , adrian.m.negreanu@intel.com, Torsten.Polle@gmx.de Subject: Re: [PATCH 5/5] uprobes: Change write_opcode() to use copy_*page() Message-ID: <20130326115935.GB639@linux.vnet.ibm.com> Reply-To: Srikar Dronamraju References: <20130324182040.GA13078@redhat.com> <20130324182125.GA13327@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline In-Reply-To: <20130324182125.GA13327@redhat.com> User-Agent: Mutt/1.5.20 (2009-06-14) X-TM-AS-MML: No X-Content-Scanned: Fidelis XPS MAILER x-cbid: 13032612-3620-0000-0000-000001C5C9BD Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1624 Lines: 57 * Oleg Nesterov [2013-03-24 19:21:25]: > Change write_opcode() to use copy_highpage() + copy_to_page() > and simplify the code. > > Signed-off-by: Oleg Nesterov Acked-by: Srikar Dronamraju > --- > kernel/events/uprobes.c | 12 ++---------- > 1 files changed, 2 insertions(+), 10 deletions(-) > > diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c > index 9d943f7..72f03d4 100644 > --- a/kernel/events/uprobes.c > +++ b/kernel/events/uprobes.c > @@ -232,7 +232,6 @@ static int write_opcode(struct mm_struct *mm, unsigned long vaddr, > uprobe_opcode_t opcode) > { > struct page *old_page, *new_page; > - void *vaddr_old, *vaddr_new; > struct vm_area_struct *vma; > int ret; > > @@ -253,15 +252,8 @@ retry: > > __SetPageUptodate(new_page); > > - /* copy the page now that we've got it stable */ > - vaddr_old = kmap_atomic(old_page); > - vaddr_new = kmap_atomic(new_page); > - > - memcpy(vaddr_new, vaddr_old, PAGE_SIZE); > - memcpy(vaddr_new + (vaddr & ~PAGE_MASK), &opcode, UPROBE_SWBP_INSN_SIZE); > - > - kunmap_atomic(vaddr_new); > - kunmap_atomic(vaddr_old); > + copy_highpage(new_page, old_page); > + copy_to_page(new_page, vaddr, &opcode, UPROBE_SWBP_INSN_SIZE); > > ret = anon_vma_prepare(vma); > if (ret) > -- > 1.5.5.1 > -- Thanks and Regards Srikar Dronamraju -- 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/