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[PATCH] i386: always enable regparm

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-mregparm=3 has been enabled by default for some time on i386, and AFAIK
there aren't any problems with it left.

This patch removes the REGPARM config option and sets -mregparm=3
unconditionally.

Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Andi Kleen <ak@suse.de>
This commit is contained in:
Adrian Bunk 2006-12-07 02:14:12 +01:00 committed by Andi Kleen
parent 73ad8355d7
commit a1a70c25be
4 changed files with 2 additions and 27 deletions
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3
Documentation/stable_api_nonsense.txt
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@ -62,9 +62,6 @@ consider the following facts about the Linux kernel:
- different structures can contain different fields - different structures can contain different fields
- Some functions may not be implemented at all, (i.e. some locks - Some functions may not be implemented at all, (i.e. some locks
compile away to nothing for non-SMP builds.) compile away to nothing for non-SMP builds.)
- Parameter passing of variables from function to function can be
done in different ways (the CONFIG_REGPARM option controls
this.)
- Memory within the kernel can be aligned in different ways, - Memory within the kernel can be aligned in different ways,
depending on the build options. depending on the build options.
- Linux runs on a wide range of different processor architectures. - Linux runs on a wide range of different processor architectures.

14
arch/i386/Kconfig
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@ -721,20 +721,6 @@ config BOOT_IOREMAP
depends on (((X86_SUMMIT || X86_GENERICARCH) && NUMA) || (X86 && EFI)) depends on (((X86_SUMMIT || X86_GENERICARCH) && NUMA) || (X86 && EFI))
default y default y
config REGPARM
bool "Use register arguments"
default y
help
Compile the kernel with -mregparm=3. This instructs gcc to use
a more efficient function call ABI which passes the first three
arguments of a function call via registers, which results in denser
and faster code.
If this option is disabled, then the default ABI of passing
arguments via the stack is used.
If unsure, say Y.
config SECCOMP config SECCOMP
bool "Enable seccomp to safely compute untrusted bytecode" bool "Enable seccomp to safely compute untrusted bytecode"
depends on PROC_FS depends on PROC_FS

4
arch/i386/Makefile
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@ -31,7 +31,7 @@ LDFLAGS_vmlinux := --emit-relocs
endif endif
CHECKFLAGS += -D__i386__ CHECKFLAGS += -D__i386__
CFLAGS += -pipe -msoft-float CFLAGS += -pipe -msoft-float -mregparm=3
# prevent gcc from keeping the stack 16 byte aligned # prevent gcc from keeping the stack 16 byte aligned
CFLAGS += $(call cc-option,-mpreferred-stack-boundary=2) CFLAGS += $(call cc-option,-mpreferred-stack-boundary=2)
@ -39,8 +39,6 @@ CFLAGS += $(call cc-option,-mpreferred-stack-boundary=2)
# CPU-specific tuning. Anything which can be shared with UML should go here. # CPU-specific tuning. Anything which can be shared with UML should go here.
include $(srctree)/arch/i386/Makefile.cpu include $(srctree)/arch/i386/Makefile.cpu
cflags-$(CONFIG_REGPARM) += -mregparm=3
# temporary until string.h is fixed # temporary until string.h is fixed
cflags-y += -ffreestanding cflags-y += -ffreestanding

8
include/asm-i386/module.h
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@ -62,18 +62,12 @@ struct mod_arch_specific
#error unknown processor family #error unknown processor family
#endif #endif
#ifdef CONFIG_REGPARM
#define MODULE_REGPARM "REGPARM "
#else
#define MODULE_REGPARM ""
#endif
#ifdef CONFIG_4KSTACKS #ifdef CONFIG_4KSTACKS
#define MODULE_STACKSIZE "4KSTACKS " #define MODULE_STACKSIZE "4KSTACKS "
#else #else
#define MODULE_STACKSIZE "" #define MODULE_STACKSIZE ""
#endif #endif
#define MODULE_ARCH_VERMAGIC MODULE_PROC_FAMILY MODULE_REGPARM MODULE_STACKSIZE #define MODULE_ARCH_VERMAGIC MODULE_PROC_FAMILY MODULE_STACKSIZE
#endif /* _ASM_I386_MODULE_H */ #endif /* _ASM_I386_MODULE_H */