From 6d021b724481fbb908eb29384898deb9f00dfe70 Mon Sep 17 00:00:00 2001
From: Russell King <rmk+kernel@arm.linux.org.uk>
Date: Tue, 10 Mar 2015 19:40:55 +0000
Subject: [PATCH] ARM: dump pgd, pmd and pte states on unhandled data abort
faults
It can be useful to dump the page table entries when an unhandled data
abort fault occurs. This can aid debugging of these situations, for
example, a STREX instruction causing an external abort on non-linefetch
fault, as has been reported recently.
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
---
arch/arm/mm/fault.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/arch/arm/mm/fault.c b/arch/arm/mm/fault.c
index a982dc3190df..6333d9c17875 100644
--- a/arch/arm/mm/fault.c
+++ b/arch/arm/mm/fault.c
@@ -552,6 +552,7 @@ do_DataAbort(unsigned long addr, unsigned int fsr, struct pt_regs *regs)
pr_alert("Unhandled fault: %s (0x%03x) at 0x%08lx\n",
inf->name, fsr, addr);
+ show_pte(current->mm, addr);
info.si_signo = inf->sig;
info.si_errno = 0;