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 <[email protected]>

diff --git a/arch/arm/mm/fault.c b/arch/arm/mm/fault.c
index a982dc3190dfb3a841bbe196f76f58cdbb554f84..6333d9c178757fe4f365b8e765b2a9ea75e2b80b 100644 (file)
--- 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;