linux-kernel - [PATCH] powerpc/e500mc: Set assembler machine type to e500mc

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Message-Id: <20180614152742.21075-1-mjeanson@efficios.com>
Date:   Thu, 14 Jun 2018 11:27:42 -0400
From:   Michael Jeanson <mjeanson@...icios.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     Michael Jeanson <mjeanson@...icios.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Kumar Gala <galak@...nel.crashing.org>,
        Vakul Garg <vakul.garg@....com>, Scott Wood <swood@...hat.com>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org
Subject: [PATCH] powerpc/e500mc: Set assembler machine type to e500mc

In binutils 2.26 a new opcode for the "wait" instruction was added for the
POWER9 and has precedence over the one specific to the e500mc. Commit
ebf714ff3756 ("powerpc/e500mc: Add support for the wait instruction in
e500_idle") uses this instruction specifically on the e500mc to work around
an erratum.

This results in an invalid instruction in idle_e500 when we build for the
e500mc on bintutils >= 2.26 with the default assembler machine type.

Since multiplatform between e500 and non-e500 is not supported, set the
assembler machine type globaly when CONFIG_PPC_E500MC=y.

Signed-off-by: Michael Jeanson <mjeanson@...icios.com>
Reviewed-by: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
CC: Benjamin Herrenschmidt <benh@...nel.crashing.org>
CC: Paul Mackerras <paulus@...ba.org>
CC: Michael Ellerman <mpe@...erman.id.au>
CC: Kumar Gala <galak@...nel.crashing.org>
CC: Vakul Garg <vakul.garg@....com>
CC: Scott Wood <swood@...hat.com>
CC: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
CC: linuxppc-dev@...ts.ozlabs.org
CC: linux-kernel@...r.kernel.org
CC: stable@...r.kernel.org
---
 arch/powerpc/Makefile | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/powerpc/Makefile b/arch/powerpc/Makefile
index 95813df90801..bb2523b4bd8f 100644
--- a/arch/powerpc/Makefile
+++ b/arch/powerpc/Makefile
@@ -251,6 +251,7 @@ cpu-as-$(CONFIG_4xx)		+= -Wa,-m405
 cpu-as-$(CONFIG_ALTIVEC)	+= $(call as-option,-Wa$(comma)-maltivec)
 cpu-as-$(CONFIG_E200)		+= -Wa,-me200
 cpu-as-$(CONFIG_PPC_BOOK3S_64)	+= -Wa,-mpower4
+cpu-as-$(CONFIG_PPC_E500MC)	+= $(call as-option,-Wa$(comma)-me500mc)
 
 KBUILD_AFLAGS += $(cpu-as-y)
 KBUILD_CFLAGS += $(cpu-as-y)
-- 
2.17.1