Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751386AbbEXQBq (ORCPT ); Sun, 24 May 2015 12:01:46 -0400 Received: from mail-pa0-f52.google.com ([209.85.220.52]:34725 "EHLO mail-pa0-f52.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751193AbbEXQBo (ORCPT ); Sun, 24 May 2015 12:01:44 -0400 From: Jungseok Lee To: linux-kernel@vger.kernel.org, linux-mm@kvack.org Cc: barami97@gmail.com, KOSAKI Motohiro , linux-arm-kernel@lists.infradead.org Subject: [RFC PATCH 1/2] kernel/fork.c: add a function to calculate page address from thread_info Date: Mon, 25 May 2015 01:01:32 +0900 Message-Id: <1432483292-23109-1-git-send-email-jungseoklee85@gmail.com> X-Mailer: git-send-email 1.9.1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1441 Lines: 43 A current implementation assumes thread_info address is always correctly calculated via virt_to_page. It restricts a different approach, such as thread_info allocation from vmalloc space. This patch, thus, introduces an independent function to calculate page address from thread_info one. Suggested-by: Sungjinn Chung Signed-off-by: Jungseok Lee Cc: KOSAKI Motohiro Cc: linux-arm-kernel@lists.infradead.org --- kernel/fork.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/kernel/fork.c b/kernel/fork.c index 03c1eaa..6300bbd 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -212,9 +212,14 @@ struct kmem_cache *vm_area_cachep; /* SLAB cache for mm_struct structures (tsk->mm) */ static struct kmem_cache *mm_cachep; +struct page * __weak arch_thread_info_to_page(struct thread_info *ti) +{ + return virt_to_page(ti); +} + static void account_kernel_stack(struct thread_info *ti, int account) { - struct zone *zone = page_zone(virt_to_page(ti)); + struct zone *zone = page_zone(arch_thread_info_to_page(ti)); mod_zone_page_state(zone, NR_KERNEL_STACK, account); } -- 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/