linux-kernel - [patch 1/7] mm: debug check for the fault vs invalidate race

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Date:	Sat, 13 Jan 2007 04:27:51 +0100 (CET)
From:	Nick Piggin <npiggin@...e.de>
To:	Linux Memory Management <linux-mm@...ck.org>
Cc:	Andrew Morton <akpm@...l.org>, Dave Airlie <airlied@...il.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Nick Piggin <npiggin@...e.de>, thomas@...gstengraphics.com
Subject: [patch 1/7] mm: debug check for the fault vs invalidate race

Add a bugcheck for Andrea's pagefault vs invalidate race. This is triggerable
for both linear and nonlinear pages with a userspace test harness (using
direct IO and truncate, respectively).

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

Index: linux-2.6/mm/filemap.c
===================================================================
--- linux-2.6.orig/mm/filemap.c
+++ linux-2.6/mm/filemap.c
@@ -120,6 +120,8 @@ void __remove_from_page_cache(struct pag
 	page->mapping = NULL;
 	mapping->nrpages--;
 	__dec_zone_page_state(page, NR_FILE_PAGES);
+
+	BUG_ON(page_mapped(page));
 }
 
 void remove_from_page_cache(struct page *page)
-
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