[POWERPC] Fix si_addr value on low level hash failures

If the low level MMU hash table insertion returns an error (which
can happen in some rare circumstances when the hypervisor refuses
the insertion of a PTE, typically if you try to access junk via
/dev/mem), the generated signal had an incorrect si_addr value due
to a bug in the assembly, which was loading it as a 32 bits quantity
instead of a 64 bits quantity.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>

diff --git a/arch/powerpc/kernel/head_64.S b/arch/powerpc/kernel/head_64.S
index 97c5857faf00d830d3022fdc4bd99caeefaed974..c34986835a4e6f80593ed4588b0bf681f5628c9c 100644 (file)
--- a/arch/powerpc/kernel/head_64.S
+++ b/arch/powerpc/kernel/head_64.S
@@ -904,7 +904,7 @@ handle_page_fault:
  */
 12:    bl      .save_nvgprs
        addi    r3,r1,STACK_FRAME_OVERHEAD
-       lwz     r4,_DAR(r1)
+       ld      r4,_DAR(r1)
        bl      .low_hash_fault
        b       .ret_from_except