[PATCH] i386: adjust page fault handling

["Jan Beulich" <JBeulich@novell.com>]

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Adjust page fault protection error check before considering it to be
a vmalloc synchronization candidate.

From: Jan Beulich <jbeulich@novell.com>

(actual patch attached)


[-- Attachment #2: linux-2.6.14-i386-pagefault.patch --]
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Adjust page fault protection error check before considering it to be
a vmalloc synchronization candidate.

From: Jan Beulich <jbeulich@novell.com>

--- 2.6.14/arch/i386/mm/fault.c	2005-10-28 02:02:08.000000000 +0200
+++ 2.6.14-i386-pagefault/arch/i386/mm/fault.c	2005-11-04 16:19:33.000000000 +0100
@@ -223,6 +223,8 @@ fastcall void do_invalid_op(struct pt_re
  *	bit 0 == 0 means no page found, 1 means protection fault
  *	bit 1 == 0 means read, 1 means write
  *	bit 2 == 0 means kernel, 1 means user-mode
+ *	bit 3 == 1 means use of reserved bit detected
+ *	bit 4 == 1 means fault was an instruction fetch
  */
 fastcall void __kprobes do_page_fault(struct pt_regs *regs,
 				      unsigned long error_code)
@@ -259,10 +261,10 @@ fastcall void __kprobes do_page_fault(st
 	 *
 	 * This verifies that the fault happens in kernel space
 	 * (error_code & 4) == 0, and that the fault was not a
-	 * protection error (error_code & 1) == 0.
+	 * protection error (error_code & 9) == 0.
 	 */
 	if (unlikely(address >= TASK_SIZE)) { 
-		if (!(error_code & 5))
+		if (!(error_code & 0xd))
 			goto vmalloc_fault;
 		/* 
 		 * Don't take the mm semaphore here. If we fixup a prefetch