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kernel/3.10: add a generic patch for cpu_has_mmips override

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Backport of commit 3ddc14add5e6341cf8ef4058c34c67ba7fd15317
from 3.11-rc1

Suggested-by: Jonas Gorski <jogo@openwrt.org>
Signed-off-by: Gabor Juhos <juhosg@openwrt.org>

SVN-Revision: 37479
This commit is contained in:
Gabor Juhos 2013-07-20 10:14:05 +00:00
parent f5f9bce168
commit a2d12049e0
1 changed files with 45 additions and 0 deletions
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45
target/linux/generic/patches-3.10/002-MIPS-Only-set-cpu_has_mmips-if-SYS_SUPPORTS_MICROMIP.patch Normal file
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@ -0,0 +1,45 @@
From 15a051ad98309f71989f9bda4b020fff160f4022 Mon Sep 17 00:00:00 2001
From: David Daney <david.daney@cavium.com>
Date: Fri, 24 May 2013 20:54:10 +0000
Subject: [PATCH 2/2] MIPS: Only set cpu_has_mmips if SYS_SUPPORTS_MICROMIPS
commit 3ddc14add5e6341cf8ef4058c34c67ba7fd15317 upstream.
As Jonas Gorske said in his patch:
Disable cpu_has_mmips for everything but SEAD3 and MALTA. Most of
these platforms are from before the micromips introduction, so they
are very unlikely to implement it.
Reduces an -Os compiled, uncompressed kernel image by 8KiB for
BCM63XX.
This patch taks a different approach than his, we gate the runtime
test for microMIPS by the config symbol SYS_SUPPORTS_MICROMIPS.
Signed-off-by: David Daney <david.daney@cavium.com>
Cc: Jonas Gorski <jogo@openwrt.org>
Cc: Steven J. Hill <Steven.Hill@imgtec.com>
Acked-by: Steven J. Hill <Steven.Hill@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/5327/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
---
arch/mips/include/asm/cpu-features.h | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
--- a/arch/mips/include/asm/cpu-features.h
+++ b/arch/mips/include/asm/cpu-features.h
@@ -99,7 +99,11 @@
#define cpu_has_rixi (cpu_data[0].options & MIPS_CPU_RIXI)
#endif
#ifndef cpu_has_mmips
-#define cpu_has_mmips (cpu_data[0].options & MIPS_CPU_MICROMIPS)
+# ifdef CONFIG_SYS_SUPPORTS_MICROMIPS
+# define cpu_has_mmips (cpu_data[0].options & MIPS_CPU_MICROMIPS)
+# else
+# define cpu_has_mmips 0
+# endif
#endif
#ifndef cpu_has_vtag_icache
#define cpu_has_vtag_icache (cpu_data[0].icache.flags & MIPS_CACHE_VTAG)