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>

1 files changed, 1 insertions, 0 deletions

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;