linux-kernel - [PATCH 30/36] autonuma: bugcheck page_autonuma fields on newly allocated pages

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Message-Id: <1345647560-30387-31-git-send-email-aarcange@redhat.com>
Date:	Wed, 22 Aug 2012 16:59:14 +0200
From:	Andrea Arcangeli <aarcange@...hat.com>
To:	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Cc:	Hillf Danton <dhillf@...il.com>, Dan Smith <danms@...ibm.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>, Paul Turner <pjt@...gle.com>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	Mike Galbraith <efault@....de>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Bharata B Rao <bharata.rao@...il.com>,
	Lee Schermerhorn <Lee.Schermerhorn@...com>,
	Rik van Riel <riel@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>,
	Christoph Lameter <cl@...ux.com>,
	Alex Shi <alex.shi@...el.com>,
	Mauricio Faria de Oliveira <mauricfo@...ux.vnet.ibm.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Don Morris <don.morris@...com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Subject: [PATCH 30/36] autonuma: bugcheck page_autonuma fields on newly allocated pages

Debug tweak.

Signed-off-by: Andrea Arcangeli <aarcange@...hat.com>
---
 include/linux/autonuma.h |   19 +++++++++++++++++++
 mm/page_alloc.c          |    3 ++-
 2 files changed, 21 insertions(+), 1 deletions(-)

diff --git a/include/linux/autonuma.h b/include/linux/autonuma.h
index 1d87ecc..8a779e0 100644
--- a/include/linux/autonuma.h
+++ b/include/linux/autonuma.h
@@ -29,6 +29,24 @@ static inline void autonuma_free_page(struct page *page)
 	}
 }
 
+static inline int autonuma_check_new_page(struct page *page)
+{
+	struct page_autonuma *page_autonuma;
+	int ret = 0;
+	if (autonuma_possible()) {
+		page_autonuma = lookup_page_autonuma(page);
+		if (unlikely(page_autonuma->autonuma_migrate_nid != -1)) {
+			ret = 1;
+			WARN_ON(1);
+		}
+		if (unlikely(page_autonuma->autonuma_last_nid != -1)) {
+			ret = 1;
+			WARN_ON(1);
+		}
+	}
+	return ret;
+}
+
 #define autonuma_printk(format, args...) \
 	if (autonuma_debug()) printk(format, ##args)
 
@@ -41,6 +59,7 @@ static inline void autonuma_migrate_split_huge_page(struct page *page,
 						    struct page *page_tail) {}
 static inline void autonuma_setup_new_exec(struct task_struct *p) {}
 static inline void autonuma_free_page(struct page *page) {}
+static inline int autonuma_check_new_page(struct page *page) { return 0; }
 
 #endif /* CONFIG_AUTONUMA */
 
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 74b73fa..87a4d5b 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -833,7 +833,8 @@ static inline int check_new_page(struct page *page)
 		(page->mapping != NULL)  |
 		(__page_count(page) != 0)  |
 		(page->flags & PAGE_FLAGS_CHECK_AT_PREP) |
-		(mem_cgroup_bad_page_check(page)))) {
+		(mem_cgroup_bad_page_check(page)) |
+		autonuma_check_new_page(page))) {
 		bad_page(page);
 		return 1;
 	}
--
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