powerpc/32s: Fix assembler warning about r0

commit b51ba4fe2e134b631f9c8f45423707aab71449b5 upstream.

The assembler says:
  arch/powerpc/kernel/head_32.S:1095: Warning: invalid register expression

It's objecting to the use of r0 as the RA argument. That's because
when RA = 0 the literal value 0 is used, rather than the content of
r0, making the use of r0 in the source potentially confusing.

Fix it to use a literal 0, the generated code is identical.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/2b69ac8e1cddff6f808fc7415907179eab4aae9e.1596693679.git.christophe.leroy@csgroup.eu
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/arch/powerpc/kernel/head_32.S b/arch/powerpc/kernel/head_32.S
index 29b2fed9328973952bee3745982fcaf603bf09f5..1fb98efd54044692ff8850acdcb2291c8503faa3 100644 (file)
--- a/arch/powerpc/kernel/head_32.S
+++ b/arch/powerpc/kernel/head_32.S
@@ -986,7 +986,7 @@ start_here:
         */
        lis     r5, abatron_pteptrs@h
        ori     r5, r5, abatron_pteptrs@l
-       stw     r5, 0xf0(r0)    /* This much match your Abatron config */
+       stw     r5, 0xf0(0)     /* This much match your Abatron config */
        lis     r6, swapper_pg_dir@h
        ori     r6, r6, swapper_pg_dir@l
        tophys(r5, r5)