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Date: Sun, 26 Nov 2006 05:31:25 +0100
From: Adrian Bunk <bunk@...sta.de>
To: linux-kernel@...r.kernel.org
Subject: [RFC: 2.6 patch] i386: always enable regparm
-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@...sta.de>
---
Documentation/stable_api_nonsense.txt | 3 ---
arch/i386/Kconfig | 14 --------------
arch/i386/Makefile | 4 +---
include/asm-i386/module.h | 8 +-------
4 files changed, 2 insertions(+), 27 deletions(-)
--- linux-2.6.19-rc6-mm1/arch/i386/Kconfig.old 2006-11-26 02:32:46.000000000 +0100
+++ linux-2.6.19-rc6-mm1/arch/i386/Kconfig 2006-11-26 02:32:55.000000000 +0100
@@ -740,20 +740,6 @@
depends on (((X86_SUMMIT || X86_GENERICARCH) && NUMA) || (X86 && EFI))
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
bool "Enable seccomp to safely compute untrusted bytecode"
depends on PROC_FS
--- linux-2.6.19-rc6-mm1/arch/i386/Makefile.old 2006-11-26 02:33:02.000000000 +0100
+++ linux-2.6.19-rc6-mm1/arch/i386/Makefile 2006-11-26 02:33:23.000000000 +0100
@@ -31,7 +31,7 @@
endif
CHECKFLAGS += -D__i386__
-CFLAGS += -pipe -msoft-float
+CFLAGS += -pipe -msoft-float -mregparm=3
# prevent gcc from keeping the stack 16 byte aligned
CFLAGS += $(call cc-option,-mpreferred-stack-boundary=2)
@@ -39,8 +39,6 @@
# CPU-specific tuning. Anything which can be shared with UML should go here.
include $(srctree)/arch/i386/Makefile.cpu
-cflags-$(CONFIG_REGPARM) += -mregparm=3
-
# temporary until string.h is fixed
cflags-y += -ffreestanding
--- linux-2.6.19-rc6-mm1/include/asm-i386/module.h.old 2006-11-26 02:34:00.000000000 +0100
+++ linux-2.6.19-rc6-mm1/include/asm-i386/module.h 2006-11-26 02:34:12.000000000 +0100
@@ -60,18 +60,12 @@
#error unknown processor family
#endif
-#ifdef CONFIG_REGPARM
-#define MODULE_REGPARM "REGPARM "
-#else
-#define MODULE_REGPARM ""
-#endif
-
#ifdef CONFIG_4KSTACKS
#define MODULE_STACKSIZE "4KSTACKS "
#else
#define MODULE_STACKSIZE ""
#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 */
--- linux-2.6.19-rc6-mm1/Documentation/stable_api_nonsense.txt.old 2006-11-26 02:34:38.000000000 +0100
+++ linux-2.6.19-rc6-mm1/Documentation/stable_api_nonsense.txt 2006-11-26 02:34:45.000000000 +0100
@@ -62,9 +62,6 @@
- different structures can contain different fields
- Some functions may not be implemented at all, (i.e. some locks
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,
depending on the build options.
- Linux runs on a wide range of different processor architectures.
-
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