powerpc: Add plain English description for alignment exception oopses

If we take an alignment exception which we cannot fix, the oops
currently prints:

Unable to handle kernel paging request for unknown fault

Lets print something more useful:

Unable to handle kernel paging request for unaligned access at address 0xc0000000f77bba8f

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

diff --git a/arch/powerpc/mm/fault.c b/arch/powerpc/mm/fault.c
index 6d535973b200dde0f64ae19a3d47f1eaca6a4c99..a67c6d781c52b9a28ac90b0c6cc1650519e9260c 100644 (file)
--- a/arch/powerpc/mm/fault.c
+++ b/arch/powerpc/mm/fault.c
@@ -529,6 +529,10 @@ void bad_page_fault(struct pt_regs *regs, unsigned long address, int sig)
                printk(KERN_ALERT "Unable to handle kernel paging request for "
                        "instruction fetch\n");
                break;
+       case 0x600:
+               printk(KERN_ALERT "Unable to handle kernel paging request for "
+                       "unaligned access at address 0x%08lx\n", regs->dar);
+               break;
        default:
                printk(KERN_ALERT "Unable to handle kernel paging request for "
                        "unknown fault\n");