Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932561AbbKMCX7 (ORCPT ); Thu, 12 Nov 2015 21:23:59 -0500 Received: from mail-pa0-f50.google.com ([209.85.220.50]:34922 "EHLO mail-pa0-f50.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932453AbbKMCX6 (ORCPT ); Thu, 12 Nov 2015 21:23:58 -0500 From: Joonsoo Kim X-Google-Original-From: Joonsoo Kim To: Andrew Morton Cc: Michal Nazarewicz , Minchan Kim , David Rientjes , linux-mm@kvack.org, linux-kernel@vger.kernel.org, Joonsoo Kim Subject: [PATCH 1/3] mm/page_isolation: return last tested pfn rather than failure indicator Date: Fri, 13 Nov 2015 11:23:46 +0900 Message-Id: <1447381428-12445-1-git-send-email-iamjoonsoo.kim@lge.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: 2175 Lines: 66 This is preparation step to report test failed pfn in new tracepoint to analyze cma allocation failure problem. There is no functional change in this patch. Acked-by: David Rientjes Acked-by: Michal Nazarewicz Signed-off-by: Joonsoo Kim --- mm/page_isolation.c | 13 ++++++------- 1 file changed, 6 insertions(+), 7 deletions(-) diff --git a/mm/page_isolation.c b/mm/page_isolation.c index 4568fd5..029a171 100644 --- a/mm/page_isolation.c +++ b/mm/page_isolation.c @@ -212,7 +212,7 @@ int undo_isolate_page_range(unsigned long start_pfn, unsigned long end_pfn, * * Returns 1 if all pages in the range are isolated. */ -static int +static unsigned long __test_page_isolated_in_pageblock(unsigned long pfn, unsigned long end_pfn, bool skip_hwpoisoned_pages) { @@ -237,9 +237,8 @@ __test_page_isolated_in_pageblock(unsigned long pfn, unsigned long end_pfn, else break; } - if (pfn < end_pfn) - return 0; - return 1; + + return pfn; } int test_pages_isolated(unsigned long start_pfn, unsigned long end_pfn, @@ -248,7 +247,6 @@ int test_pages_isolated(unsigned long start_pfn, unsigned long end_pfn, unsigned long pfn, flags; struct page *page; struct zone *zone; - int ret; /* * Note: pageblock_nr_pages != MAX_ORDER. Then, chunks of free pages @@ -266,10 +264,11 @@ int test_pages_isolated(unsigned long start_pfn, unsigned long end_pfn, /* Check all pages are free or marked as ISOLATED */ zone = page_zone(page); spin_lock_irqsave(&zone->lock, flags); - ret = __test_page_isolated_in_pageblock(start_pfn, end_pfn, + pfn = __test_page_isolated_in_pageblock(start_pfn, end_pfn, skip_hwpoisoned_pages); spin_unlock_irqrestore(&zone->lock, flags); - return ret ? 0 : -EBUSY; + + return pfn < end_pfn ? -EBUSY : 0; } struct page *alloc_migrate_target(struct page *page, unsigned long private, -- 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/