Messages in this thread Patch in this message | | | Date | Fri, 11 Nov 2005 02:35:52 -0600 | From | Matt Mackall <> | Subject | [PATCH 7/15] misc: 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>
Index: 2.6.14-misc/arch/i386/kernel/Makefile =================================================================== --- 2.6.14-misc.orig/arch/i386/kernel/Makefile 2005-10-27 17:02:08.000000000 -0700 +++ 2.6.14-misc/arch/i386/kernel/Makefile 2005-11-09 11:19:46.000000000 -0800 @@ -7,7 +7,7 @@ extra-y := head.o init_task.o vmlinux.ld 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 Index: 2.6.14-misc/arch/i386/kernel/cpu/common.c =================================================================== --- 2.6.14-misc.orig/arch/i386/kernel/cpu/common.c 2005-11-01 10:54:31.000000000 -0800 +++ 2.6.14-misc/arch/i386/kernel/cpu/common.c 2005-11-09 11:19:46.000000000 -0800 @@ -628,8 +628,10 @@ 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"); Index: 2.6.14-misc/init/Kconfig =================================================================== --- 2.6.14-misc.orig/init/Kconfig 2005-11-01 10:54:33.000000000 -0800 +++ 2.6.14-misc/init/Kconfig 2005-11-09 11:19:46.000000000 -0800 @@ -315,6 +315,15 @@ 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 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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