linux-kernel - [PATCH 6/7] mtrr: introduce HAVE_MTRR_VENDOR

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Date:	Wed, 9 Dec 2009 06:17:52 +0100
From:	Michał Mirosław  
	<mirq-linux@...e.qmqm.pl>
To:	linux-kernel@...r.kernel.org
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org
Subject: [PATCH 6/7] mtrr: introduce HAVE_MTRR_VENDOR_SPECIFIC

In case that only generic MTRR implementation is needed, tell gcc
to optimize out tests for other implementations. Also remove .vendor
from mtrr_ops in this configuration.

Signed-off-by: Michał Mirosław <mirq-linux@...e.qmqm.pl>
---
 arch/x86/Kconfig                |    3 +++
 arch/x86/Kconfig.cpu            |    3 +++
 arch/x86/kernel/cpu/mtrr/mtrr.h |   12 +++++++++++-
 3 files changed, 17 insertions(+), 1 deletions(-)

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 32a1918..91422d0 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -1367,6 +1367,9 @@ config MTRR
 
 	  See <file:Documentation/x86/mtrr.txt> for more information.
 
+config HAVE_MTRR_VENDOR_SPECIFIC
+	def_bool n
+
 config MTRR_SANITIZER
 	def_bool y
 	prompt "MTRR cleanup support"
diff --git a/arch/x86/Kconfig.cpu b/arch/x86/Kconfig.cpu
index bae1193..d7a6838 100644
--- a/arch/x86/Kconfig.cpu
+++ b/arch/x86/Kconfig.cpu
@@ -439,6 +439,7 @@ config CPU_SUP_CYRIX_32
 	default y
 	bool "Support Cyrix processors" if PROCESSOR_SELECT
 	depends on !64BIT
+	select HAVE_MTRR_VENDOR_SPECIFIC
 	---help---
 	  This enables detection, tunings and quirks for Cyrix processors
 
@@ -464,6 +465,7 @@ config CPU_SUP_AMD
 
 config CPU_SUP_AMD_32
 	def_bool y if CPU_SUP_AMD && !64BIT
+	select HAVE_MTRR_VENDOR_SPECIFIC
 
 config CPU_SUP_CENTAUR
 	default y
@@ -480,6 +482,7 @@ config CPU_SUP_CENTAUR
 
 config CPU_SUP_CENTAUR_32
 	def_bool y if CPU_SUP_CENTAUR && !64BIT
+	select HAVE_MTRR_VENDOR_SPECIFIC
 
 config CPU_SUP_TRANSMETA_32
 	default y
diff --git a/arch/x86/kernel/cpu/mtrr/mtrr.h b/arch/x86/kernel/cpu/mtrr/mtrr.h
index 562e2e3..7a87e65 100644
--- a/arch/x86/kernel/cpu/mtrr/mtrr.h
+++ b/arch/x86/kernel/cpu/mtrr/mtrr.h
@@ -12,7 +12,9 @@
 extern unsigned int mtrr_usage_table[MTRR_MAX_VAR_RANGES];
 
 struct mtrr_ops {
+#ifdef CONFIG_HAVE_MTRR_VENDOR_SPECIFIC
 	u32	vendor;
+#endif
 	void	(*set)(unsigned int reg, unsigned long base,
 		       unsigned long size, mtrr_type type);
 	void	(*set_all)(void);
@@ -32,7 +34,7 @@ extern int generic_validate_add_page(unsigned long base, unsigned long size,
 				     unsigned int type);
 
 extern const struct mtrr_ops generic_mtrr_ops;
-#ifdef CONFIG_X86_32
+#ifdef CONFIG_HAVE_MTRR_VENDOR_SPECIFIC
 extern const struct mtrr_ops amd_mtrr_ops;
 extern const struct mtrr_ops centaur_mtrr_ops;
 extern const struct mtrr_ops cyrix_mtrr_ops;
@@ -60,8 +62,16 @@ void get_mtrr_state(void);
 extern u64 size_or_mask, size_and_mask;
 extern const struct mtrr_ops *mtrr_if;
 
+#ifdef CONFIG_HAVE_MTRR_VENDOR_SPECIFIC
+
 #define is_cpu(vnd)	(mtrr_if && mtrr_if->vendor == X86_VENDOR_##vnd)
 
+#else
+
+#define is_cpu(vnd)	(mtrr_if && 0 == X86_VENDOR_##vnd)
+
+#endif
+
 extern unsigned int num_var_ranges;
 extern u64 mtrr_tom2;
 extern struct mtrr_state_type mtrr_state;
-- 
1.6.4.4

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