UBUNTU: SAUCE: rfi-flush: Fix the fallback flush to actually activate

CVE-2017-5754

BugLink: http://bugs.launchpad.net/bugs/1742772

Since we now have three nops, we need to branch further to get over
the nops to the branch to the fallback flush.

Instead of putting the branch in slot 1 and branching by 8, put it in
0 and branch all the way to keep it simple.
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Marcelo Henrique Cerri <marcelo.cerri@canonical.com>

arch/powerpc/lib/feature-fixups.c

@@ -129,8 +129,8 @@ void do_rfi_flush_fixups(enum l1d_flush_type types)
 	instrs[2] = 0x60000000; /* nop */
 
 	if (types & L1D_FLUSH_FALLBACK)
-		/* b .+8 to fallback flush */
-		instrs[1] = 0x48000008;
+		/* b .+16 to fallback flush */
+		instrs[0] = 0x48000010;
 
 	i = 0;
 	if (types & L1D_FLUSH_ORI) {