linux-kernel - [patch 2/3] mm: locks

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Date:	Sat,  7 Oct 2006 15:05:54 +0200 (CEST)
From:	Nick Piggin <npiggin@...e.de>
To:	Linux Memory Management <linux-mm@...ck.org>,
	Andrew Morton <akpm@...l.org>
Cc:	Linux Kernel <linux-kernel@...r.kernel.org>,
	Nick Piggin <npiggin@...e.de>
Subject: [patch 2/3] mm: locks_freed fix

Move the lock debug checks below the page reserved checks.
Also, having debug_check_no_locks_freed in kernel_map_pages is wrong.

Signed-off-by: Nick Piggin <npiggin@...e.de>

Index: linux-2.6/include/linux/mm.h
===================================================================
--- linux-2.6.orig/include/linux/mm.h	2006-10-06 11:59:47.000000000 +1000
+++ linux-2.6/include/linux/mm.h	2006-10-06 12:00:02.000000000 +1000
@@ -1038,12 +1038,7 @@ static inline void vm_stat_account(struc
 
 #ifndef CONFIG_DEBUG_PAGEALLOC
 static inline void
-kernel_map_pages(struct page *page, int numpages, int enable)
-{
-	if (!PageHighMem(page) && !enable)
-		debug_check_no_locks_freed(page_address(page),
-					   numpages * PAGE_SIZE);
-}
+kernel_map_pages(struct page *page, int numpages, int enable) {}
 #endif
 
 extern struct vm_area_struct *get_gate_vma(struct task_struct *tsk);
Index: linux-2.6/mm/page_alloc.c
===================================================================
--- linux-2.6.orig/mm/page_alloc.c	2006-10-06 11:59:47.000000000 +1000
+++ linux-2.6/mm/page_alloc.c	2006-10-06 12:01:52.000000000 +1000
@@ -443,15 +443,13 @@ static void __free_pages_ok(struct page 
 	int i;
 	int reserved = 0;
 
-	if (!PageHighMem(page))
-		debug_check_no_locks_freed(page_address(page),
-					   PAGE_SIZE<<order);
-
 	for (i = 0 ; i < (1 << order) ; ++i)
 		reserved += free_pages_check(page + i);
 	if (reserved)
 		return;
 
+	if (!PageHighMem(page))
+		debug_check_no_locks_freed(page_address(page),PAGE_SIZE<<order);
 	arch_free_page(page, order);
 	kernel_map_pages(page, 1 << order, 0);
 
@@ -723,6 +721,8 @@ static void fastcall free_hot_cold_page(
 	if (free_pages_check(page))
 		return;
 
+	if (!PageHighMem(page))
+		debug_check_no_locks_freed(page_address(page), PAGE_SIZE);
 	arch_free_page(page, 0);
 	kernel_map_pages(page, 1, 0);
 
-
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