--- /dev/null
+From b51ba4fe2e134b631f9c8f45423707aab71449b5 Mon Sep 17 00:00:00 2001
+From: Christophe Leroy <christophe.leroy@csgroup.eu>
+Date: Thu, 6 Aug 2020 06:01:42 +0000
+Subject: powerpc/32s: Fix assembler warning about r0
+
+From: Christophe Leroy <christophe.leroy@csgroup.eu>
+
+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>
+---
+ arch/powerpc/kernel/head_32.S | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+--- a/arch/powerpc/kernel/head_32.S
++++ b/arch/powerpc/kernel/head_32.S
+@@ -922,7 +922,7 @@ END_MMU_FTR_SECTION_IFSET(MMU_FTR_HPTE_T
+ */
+ 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)