linux-kernel - [patch added to 3.12-stable] MIPS: ip22: Fix ip28 build for modern gcc

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Date:   Wed, 22 Mar 2017 16:57:39 +0100
From:   Jiri Slaby <jslaby@...e.cz>
To:     stable@...r.kernel.org
Cc:     Arnd Bergmann <arnd@...db.de>, linux-mips@...ux-mips.org,
        linux-kernel@...r.kernel.org, Ralf Baechle <ralf@...ux-mips.org>,
        Jiri Slaby <jslaby@...e.cz>
Subject: [patch added to 3.12-stable] MIPS: ip22: Fix ip28 build for modern gcc

From: Arnd Bergmann <arnd@...db.de>

This patch has been added to the 3.12 stable tree. If you have any
objections, please let us know.

===============

commit 23ca9b522383d3b9b7991d8586db30118992af4a upstream.

kernelci reports a failure of the ip28_defconfig build after upgrading its
gcc version:

arch/mips/sgi-ip22/Platform:29: *** gcc doesn't support needed option -mr10k-cache-barrier=store.  Stop.

The problem apparently is that the -mr10k-cache-barrier=store option is now
rejected for CPUs other than r10k. Explicitly including the CPU in the
check fixes this and is safe because both options were introduced in
gcc-4.4.

Signed-off-by: Arnd Bergmann <arnd@...db.de>
Cc: linux-mips@...ux-mips.org
Cc: linux-kernel@...r.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/15049/
Signed-off-by: Ralf Baechle <ralf@...ux-mips.org>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 arch/mips/sgi-ip22/Platform | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/mips/sgi-ip22/Platform b/arch/mips/sgi-ip22/Platform
index b7a4b7e04c38..e8f6b3a42a48 100644
--- a/arch/mips/sgi-ip22/Platform
+++ b/arch/mips/sgi-ip22/Platform
@@ -25,7 +25,7 @@ endif
 # Simplified: what IP22 does at 128MB+ in ksegN, IP28 does at 512MB+ in xkphys
 #
 ifdef CONFIG_SGI_IP28
-  ifeq ($(call cc-option-yn,-mr10k-cache-barrier=store), n)
+  ifeq ($(call cc-option-yn,-march=r10000 -mr10k-cache-barrier=store), n)
       $(error gcc doesn't support needed option -mr10k-cache-barrier=store)
   endif
 endif
-- 
2.12.0