linux-kernel - [patch 1/3] mm: arch_free

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Date:	Sat,  7 Oct 2006 15:05:46 +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 1/3] mm: arch_free_page fix

After the PG_reserved check was added, arch_free_page was being called in the
wrong place (it could be called for a page we don't actually want to free).
Fix that.

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

Index: linux-2.6/mm/page_alloc.c
===================================================================
--- linux-2.6.orig/mm/page_alloc.c	2006-08-05 18:38:50.000000000 +1000
+++ linux-2.6/mm/page_alloc.c	2006-09-17 17:19:32.000000000 +1000
@@ -443,7 +443,6 @@ static void __free_pages_ok(struct page 
 	int i;
 	int reserved = 0;
 
-	arch_free_page(page, order);
 	if (!PageHighMem(page))
 		debug_check_no_locks_freed(page_address(page),
 					   PAGE_SIZE<<order);
@@ -453,7 +452,9 @@ static void __free_pages_ok(struct page 
 	if (reserved)
 		return;
 
+	arch_free_page(page, order);
 	kernel_map_pages(page, 1 << order, 0);
+
 	local_irq_save(flags);
 	__count_vm_events(PGFREE, 1 << order);
 	free_one_page(page_zone(page), page, order);
@@ -717,13 +718,12 @@ static void fastcall free_hot_cold_page(
 	struct per_cpu_pages *pcp;
 	unsigned long flags;
 
-	arch_free_page(page, 0);
-
 	if (PageAnon(page))
 		page->mapping = NULL;
 	if (free_pages_check(page))
 		return;
 
+	arch_free_page(page, 0);
 	kernel_map_pages(page, 1, 0);
 
 	pcp = &zone_pcp(zone, get_cpu())->pcp[cold];
-
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