mpm at selenic
Dec 28, 2005, 1:24 PM
Post #1 of 7
(800 views)
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[PATCH] Make sysenter support optional
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This adds configurable sysenter support on x86. This saves about 5k on
small systems.
$ size vmlinux-baseline vmlinux
text data bss dec hex filename
2920821 523232 190652 3634705 377611 vmlinux-baseline
2920558 518376 190652 3629586 376212 vmlinux
Signed-off-by: Matt Mackall <mpm[at]selenic.com>
Index: 2.6.15-misc/arch/i386/kernel/Makefile
===================================================================
--- 2.6.15-misc.orig/arch/i386/kernel/Makefile 2005-12-28 14:51:45.000000000 -0600
+++ 2.6.15-misc/arch/i386/kernel/Makefile 2005-12-28 14:51:46.000000000 -0600
@@ -31,7 +31,7 @@ obj-$(CONFIG_X86_NUMAQ) += numaq.o
obj-$(CONFIG_X86_SUMMIT_NUMA) += summit.o
obj-$(CONFIG_KPROBES) += kprobes.o
obj-$(CONFIG_MODULES) += module.o
-obj-y += sysenter.o vsyscall.o
+obj-$(CONFIG_SYSENTER) += sysenter.o vsyscall.o
obj-$(CONFIG_ACPI_SRAT) += srat.o
obj-$(CONFIG_HPET_TIMER) += time_hpet.o
obj-$(CONFIG_EFI) += efi.o efi_stub.o
Index: 2.6.15-misc/include/asm-i386/elf.h
===================================================================
--- 2.6.15-misc.orig/include/asm-i386/elf.h 2005-12-28 14:36:59.000000000 -0600
+++ 2.6.15-misc/include/asm-i386/elf.h 2005-12-28 14:51:47.000000000 -0600
@@ -134,11 +134,13 @@ extern int dump_task_extended_fpu (struc
#define VSYSCALL_ENTRY ((unsigned long) &__kernel_vsyscall)
extern void __kernel_vsyscall;
+#ifdef CONFIG_SYSENTER
#define ARCH_DLINFO \
do { \
NEW_AUX_ENT(AT_SYSINFO, VSYSCALL_ENTRY); \
NEW_AUX_ENT(AT_SYSINFO_EHDR, VSYSCALL_BASE); \
} while (0)
+#endif
/*
* These macros parameterize elf_core_dump in fs/binfmt_elf.c to write out
Index: 2.6.15-misc/init/Kconfig
===================================================================
--- 2.6.15-misc.orig/init/Kconfig 2005-12-28 14:51:45.000000000 -0600
+++ 2.6.15-misc/init/Kconfig 2005-12-28 14:51:47.000000000 -0600
@@ -352,6 +352,14 @@ config VM86
XFree86 to initialize some video cards via BIOS. Disabling this
option saves about 6k.
+config SYSENTER
+ depends X86
+ default y
+ bool "Enable syscalls via sysenter" if EMBEDDED
+ help
+ Disabling this feature removes sysenter handling as well as
+ vsyscall fixmaps.
+
config CC_OPTIMIZE_FOR_SIZE
bool "Optimize for size"
default y if ARM || H8300
Index: 2.6.15-misc/include/asm-i386/processor.h
===================================================================
--- 2.6.15-misc.orig/include/asm-i386/processor.h 2005-12-28 14:51:44.000000000 -0600
+++ 2.6.15-misc/include/asm-i386/processor.h 2005-12-28 14:51:41.000000000 -0600
@@ -709,8 +709,14 @@ extern void select_idle_routine(const st
#define cache_line_size() (boot_cpu_data.x86_cache_alignment)
extern unsigned long boot_option_idle_override;
+
+#ifdef CONFIG_SYSENTER
extern void enable_sep_cpu(void);
extern int sysenter_setup(void);
+#else
+#define enable_sep_cpu()
+static inline int sysenter_setup(void) { return 0; }
+#endif
#ifdef CONFIG_MTRR
extern void mtrr_ap_init(void);
--
Mathematics is the supreme nostalgia of our time.
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