linux-kernel - [PATCH 3.16 153/366] powerpc/e500mc: Set assembler machine type to e500mc

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Date:   Sun, 11 Nov 2018 19:49:05 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, linuxppc-dev@...ts.ozlabs.org,
        "Scott Wood" <swood@...hat.com>,
        "Kumar Gala" <galak@...nel.crashing.org>,
        "Benjamin Herrenschmidt" <benh@...nel.crashing.org>,
        "Vakul Garg" <vakul.garg@....com>,
        "Michael Jeanson" <mjeanson@...icios.com>,
        "Michael Ellerman" <mpe@...erman.id.au>,
        "Mathieu Desnoyers" <mathieu.desnoyers@...icios.com>,
        "Paul Mackerras" <paulus@...ba.org>
Subject: [PATCH 3.16 153/366] powerpc/e500mc: Set assembler machine type
 to e500mc

3.16.61-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Michael Jeanson <mjeanson@...icios.com>

commit 69a8405999aa1c489de4b8d349468f0c2b83f093 upstream.

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
Signed-off-by: Michael Ellerman <mpe@...erman.id.au>
[bwh: Backported to 3.16: adjust context]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 arch/powerpc/Makefile | 1 +
 1 file changed, 1 insertion(+)

--- a/arch/powerpc/Makefile
+++ b/arch/powerpc/Makefile
@@ -205,6 +205,7 @@ endif
 cpu-as-$(CONFIG_4xx)		+= -Wa,-m405
 cpu-as-$(CONFIG_ALTIVEC)	+= -Wa,-maltivec
 cpu-as-$(CONFIG_E200)		+= -Wa,-me200
+cpu-as-$(CONFIG_PPC_E500MC)	+= $(call as-option,-Wa$(comma)-me500mc)
 
 KBUILD_AFLAGS += $(cpu-as-y)
 KBUILD_CFLAGS += $(cpu-as-y)