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Subject[PATCH 1/1] [x86] Configuration options to compile out x86 CPU support code
Date
This patch adds some configuration options that allow to compile out
CPU vendor-specific code in x86 kernels (in arch/x86/kernel/cpu). The
new configuration options are only visible when CONFIG_EMBEDDED is
selected, as they are mostly interesting for space savings reasons.

An example of size saving, on x86 with only Intel CPU support:

text data bss dec hex filename
1125479 118760 212992 1457231 163c4f vmlinux.old
1121355 116536 212992 1450883 162383 vmlinux
-4124 -2224 0 -6348 -18CC +/-

However, I'm not exactly sure that the Kconfig wording is correct with
regard to !64BIT / 64BIT.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Cc: tglx@linutronix.de
Cc: mingo@redhat.com
Cc: hpa@zytor.com
Cc: michael@free-electrons.com
---
arch/x86/Kconfig.cpu | 70 ++++++++++++++++++++++++++++++++++++++++++
arch/x86/kernel/cpu/Makefile | 19 ++++++-----
include/asm-x86/bugs.h | 5 +++
3 files changed, 85 insertions(+), 9 deletions(-)

diff --git a/arch/x86/Kconfig.cpu b/arch/x86/Kconfig.cpu
index 2c518fb..6156ac2 100644
--- a/arch/x86/Kconfig.cpu
+++ b/arch/x86/Kconfig.cpu
@@ -415,3 +415,73 @@ config X86_MINIMUM_CPU_FAMILY
config X86_DEBUGCTLMSR
def_bool y
depends on !(MK6 || MWINCHIPC6 || MWINCHIP2 || MWINCHIP3D || MCYRIXIII || M586MMX || M586TSC || M586 || M486 || M386)
+
+menuconfig PROCESSOR_SELECT
+ default y
+ bool "Supported processor vendors" if EMBEDDED
+ help
+ This lets you choose what x86 vendor support code your kernel
+ will include.
+
+config CPU_SUP_INTEL_32
+ default y
+ bool "Support Intel processors" if PROCESSOR_SELECT
+ depends on !64BIT
+ help
+ This enables extended support for Intel processors
+
+config CPU_SUP_INTEL_64
+ default y
+ bool "Support Intel processors" if PROCESSOR_SELECT
+ depends on 64BIT
+ help
+ This enables extended support for Intel processors
+
+config CPU_SUP_CYRIX_32
+ default y
+ bool "Support Cyrix processors" if PROCESSOR_SELECT
+ depends on !64BIT
+ help
+ This enables extended support for Cyrix processors
+
+config CPU_SUP_AMD_32
+ default y
+ bool "Support AMD processors" if PROCESSOR_SELECT
+ depends on !64BIT
+ help
+ This enables extended support for AMD processors
+
+config CPU_SUP_AMD_64
+ default y
+ bool "Support AMD processors" if PROCESSOR_SELECT
+ depends on 64BIT
+ help
+ This enables extended support for AMD processors
+
+config CPU_SUP_CENTAUR_32
+ default y
+ bool "Support Centaur processors" if PROCESSOR_SELECT
+ depends on !64BIT
+ help
+ This enables extended support for Centaur processors
+
+config CPU_SUP_CENTAUR_64
+ default y
+ bool "Support Centaur processors" if PROCESSOR_SELECT
+ depends on 64BIT
+ help
+ This enables extended support for Centaur processors
+
+config CPU_SUP_TRANSMETA_32
+ default y
+ bool "Support Transmeta processors" if PROCESSOR_SELECT
+ depends on !64BIT
+ help
+ This enables extended support for Transmeta processors
+
+config CPU_SUP_UMC_32
+ default y
+ bool "Support UMC processors" if PROCESSOR_SELECT
+ depends on !64BIT
+ help
+ This enables extended support for UMC processors
diff --git a/arch/x86/kernel/cpu/Makefile b/arch/x86/kernel/cpu/Makefile
index ee76eaa..a35ee92 100644
--- a/arch/x86/kernel/cpu/Makefile
+++ b/arch/x86/kernel/cpu/Makefile
@@ -7,15 +7,16 @@ obj-y += proc.o feature_names.o

obj-$(CONFIG_X86_32) += common.o bugs.o
obj-$(CONFIG_X86_64) += common_64.o bugs_64.o
-obj-$(CONFIG_X86_32) += amd.o
-obj-$(CONFIG_X86_64) += amd_64.o
-obj-$(CONFIG_X86_32) += cyrix.o
-obj-$(CONFIG_X86_32) += centaur.o
-obj-$(CONFIG_X86_64) += centaur_64.o
-obj-$(CONFIG_X86_32) += transmeta.o
-obj-$(CONFIG_X86_32) += intel.o
-obj-$(CONFIG_X86_64) += intel_64.o
-obj-$(CONFIG_X86_32) += umc.o
+
+obj-$(CONFIG_CPU_SUP_AMD_32) += amd.o
+obj-$(CONFIG_CPU_SUP_AMD_64) += amd_64.o
+obj-$(CONFIG_CPU_SUP_CYRIX_32) += cyrix.o
+obj-$(CONFIG_CPU_SUP_CENTAUR_32) += centaur.o
+obj-$(CONFIG_CPU_SUP_CENTAUR_64) += centaur_64.o
+obj-$(CONFIG_CPU_SUP_TRANSMETA_32) += transmeta.o
+obj-$(CONFIG_CPU_SUP_INTEL_32) += intel.o
+obj-$(CONFIG_CPU_SUP_INTEL_64) += intel_64.o
+obj-$(CONFIG_CPU_SUP_UMC_32) += umc.o

obj-$(CONFIG_X86_MCE) += mcheck/
obj-$(CONFIG_MTRR) += mtrr/
diff --git a/include/asm-x86/bugs.h b/include/asm-x86/bugs.h
index 021cbdd..66cf8c9 100644
--- a/include/asm-x86/bugs.h
+++ b/include/asm-x86/bugs.h
@@ -2,6 +2,11 @@
#define _ASM_X86_BUGS_H

extern void check_bugs(void);
+
+#ifdef CONFIG_CPU_SUP_INTEL_32
int ppro_with_ram_bug(void);
+#else
+#define ppro_with_ram_bug() (0)
+#endif

#endif /* _ASM_X86_BUGS_H */
--
1.5.4.3


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