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[PATCH] tiny: Make x86 doublefault handling optional

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This adds configurable support for doublefault reporting on x86

add/remove: 0/3 grow/shrink: 0/1 up/down: 0/-13048 (-13048)
function                                     old     new   delta
cpu_init                                     846     786     -60
doublefault_fn                               188       -    -188
doublefault_stack                           4096       -   -4096
doublefault_tss                             8704       -   -8704

Signed-off-by: Matt Mackall <mpm@selenic.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Matt Mackall 2006-01-08 01:05:24 -08:00 committed by Linus Torvalds
parent 18e92b12e8
commit 22c4e3084e
3 changed files with 13 additions and 1 deletions
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3
arch/i386/kernel/Makefile
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@ -7,7 +7,7 @@ extra-y := head.o init_task.o vmlinux.lds
obj-y := process.o semaphore.o signal.o entry.o traps.o irq.o vm86.o \
ptrace.o time.o ioport.o ldt.o setup.o i8259.o sys_i386.o \
pci-dma.o i386_ksyms.o i387.o dmi_scan.o bootflag.o \
doublefault.o quirks.o i8237.o
quirks.o i8237.o
obj-y += cpu/
obj-y += timers/
@ -33,6 +33,7 @@ obj-y += sysenter.o vsyscall.o
obj-$(CONFIG_ACPI_SRAT) += srat.o
obj-$(CONFIG_HPET_TIMER) += time_hpet.o
obj-$(CONFIG_EFI) += efi.o efi_stub.o
obj-$(CONFIG_DOUBLEFAULT) += doublefault.o
obj-$(CONFIG_EARLY_PRINTK) += early_printk.o
EXTRA_AFLAGS := -traditional

2
arch/i386/kernel/cpu/common.c
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@ -609,8 +609,10 @@ void __devinit cpu_init(void)
load_TR_desc();
load_LDT(&init_mm.context);
#ifdef CONFIG_DOUBLEFAULT
/* Set up doublefault TSS pointer in the GDT */
__set_tss_desc(cpu, GDT_ENTRY_DOUBLEFAULT_TSS, &doublefault_tss);
#endif
/* Clear %fs and %gs. */
asm volatile ("xorl %eax, %eax; movl %eax, %fs; movl %eax, %gs");

9
init/Kconfig
View File

@ -309,6 +309,15 @@ config BUG
option for embedded systems with no facilities for reporting errors.
Just say Y.
config DOUBLEFAULT
depends X86
default y if X86
bool "Enable doublefault exception handler" if EMBEDDED
help
This option allows trapping of rare doublefault exceptions that
would otherwise cause a system to silently reboot. Disabling this
option saves about 4k.
config BASE_FULL
default y
bool "Enable full-sized data structures for core" if EMBEDDED