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>

1 files changed, 4 insertions, 0 deletions

diff --git a/arch/powerpc/mm/fault.c b/arch/powerpc/mm/fault.c
index 6d535973b200..a67c6d781c52 100644
--- 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");