Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932137AbbDMJ4u (ORCPT ); Mon, 13 Apr 2015 05:56:50 -0400 Received: from e06smtp15.uk.ibm.com ([195.75.94.111]:32843 "EHLO e06smtp15.uk.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753527AbbDMJ4p (ORCPT ); Mon, 13 Apr 2015 05:56:45 -0400 From: Laurent Dufour To: Andrew Morton , "Kirill A. Shutemov" , Hugh Dickins , Rik van Riel , Mel Gorman , Pavel Emelyanov , linux-mm@kvack.org, linux-kernel@vger.kernel.org, Benjamin Herrenschmidt , Paul Mackerras , Michael Ellerman , Ingo Molnar , linuxppc-dev@lists.ozlabs.org Cc: cov@codeaurora.org, criu@openvz.org Subject: [RESEND PATCH v3 1/2] mm: Introducing arch_remap hook Date: Mon, 13 Apr 2015 11:56:27 +0200 Message-Id: <9d827fc618a718830b2c47aa87e8be546914c897.1428916945.git.ldufour@linux.vnet.ibm.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: References: In-Reply-To: References: X-TM-AS-MML: disable X-Content-Scanned: Fidelis XPS MAILER x-cbid: 15041309-0021-0000-0000-0000038B57CE Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2138 Lines: 66 Some architecture would like to be triggered when a memory area is moved through the mremap system call. This patch is introducing a new arch_remap mm hook which is placed in the path of mremap, and is called before the old area is unmapped (and the arch_unmap hook is called). The architectures which need to call this hook should define __HAVE_ARCH_REMAP in their asm/mmu_context.h and provide the arch_remap service with the following prototype: void arch_remap(struct mm_struct *mm, unsigned long old_start, unsigned long old_end, unsigned long new_start, unsigned long new_end); Signed-off-by: Laurent Dufour Reviewed-by: Ingo Molnar --- mm/mremap.c | 19 +++++++++++++------ 1 file changed, 13 insertions(+), 6 deletions(-) diff --git a/mm/mremap.c b/mm/mremap.c index 2dc44b1cb1df..009db5565893 100644 --- a/mm/mremap.c +++ b/mm/mremap.c @@ -25,6 +25,7 @@ #include #include +#include #include "internal.h" @@ -286,13 +287,19 @@ static unsigned long move_vma(struct vm_area_struct *vma, old_len = new_len; old_addr = new_addr; new_addr = -ENOMEM; - } else if (vma->vm_file && vma->vm_file->f_op->mremap) { - err = vma->vm_file->f_op->mremap(vma->vm_file, new_vma); - if (err < 0) { - move_page_tables(new_vma, new_addr, vma, old_addr, - moved_len, true); - return err; + } else { + if (vma->vm_file && vma->vm_file->f_op->mremap) { + err = vma->vm_file->f_op->mremap(vma->vm_file, new_vma); + if (err < 0) { + move_page_tables(new_vma, new_addr, vma, + old_addr, moved_len, true); + return err; + } } +#ifdef __HAVE_ARCH_REMAP + arch_remap(mm, old_addr, old_addr+old_len, + new_addr, new_addr+new_len); +#endif } /* Conceal VM_ACCOUNT so old reservation is not undone */ -- 1.9.1 -- 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/