[PATCH] Print error code in page faults

[Glauber de Oliveira Costa <gcosta@redhat.com>]

When a page faults comes from a kernel space, the printed summary
leaves us clueless about what kind of access was being tried (which
is encoded in the error_code variable).

Having it promply available may ease debugging in a bunch of
situations.

Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com>


diff --git a/arch/x86_64/mm/fault.c b/arch/x86_64/mm/fault.c
index 6ada723..e65522e 100644
--- a/arch/x86_64/mm/fault.c
+++ b/arch/x86_64/mm/fault.c
@@ -539,7 +539,7 @@ no_context:
 		printk(KERN_ALERT "Unable to handle kernel NULL pointer dereference");
 	else
 		printk(KERN_ALERT "Unable to handle kernel paging request");
-	printk(" at %016lx RIP: \n" KERN_ALERT,address);
+	printk(" at %016lx (error=0x%02lx) RIP: \n" KERN_ALERT, error_code, address);
 	printk_address(regs->rip);
 	dump_pagetable(address);
 	tsk->thread.cr2 = address;