parisc: Unbreak handling exceptions from kernel modules
authorHelge Deller <deller@gmx.de>
Fri, 8 Apr 2016 16:32:52 +0000 (18:32 +0200)
committerBen Hutchings <ben@decadent.org.uk>
Sat, 30 Apr 2016 22:05:23 +0000 (00:05 +0200)
commit 2ef4dfd9d9f288943e249b78365a69e3ea3ec072 upstream.

Handling exceptions from modules never worked on parisc.
It was just masked by the fact that exceptions from modules
don't happen during normal use.

When a module triggers an exception in get_user() we need to load the
main kernel dp value before accessing the exception_data structure, and
afterwards restore the original dp value of the module on exit.

Noticed-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Helge Deller <deller@gmx.de>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
arch/parisc/include/asm/uaccess.h
arch/parisc/kernel/asm-offsets.c
arch/parisc/lib/fixup.S
arch/parisc/mm/fault.c

Simple merge
Simple merge
Simple merge
Simple merge