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3dab307e52
linux/arch/i386/kernel
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Chuck Ebbert 3dab307e52 i386: Fix double fault handler 
The new percpu code has apparently broken the doublefault handler
when CONFIG_DEBUG_SPINLOCK is set. Doublefault is handled by
a hardware task, making the check

        SPIN_BUG_ON(lock->owner == current, lock, "recursion");

fault because it uses the FS register to access the percpu data
for current, and that register is zero in the new TSS. (The trace
I saw was on 2.6.20 where it was GS, but it looks like this will
still happen with FS on 2.6.22.)

Initializing FS in the doublefault_tss should fix it.

AK: Also fix broken ptr_ok() and turn printks into KERN_EMERG
AK: And add a PANIC prefix to make clear the system will hang
AK: (e.g. x86-64 will recover)

Signed-off-by: Chuck Ebbert <cebbert@redhat.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-08-11 15:58:14 -07:00
..
acpi ACPI: restore CONFIG_ACPI_SLEEP 2007-07-29 16:53:59 -07:00
cpu i386: Use global flag to disable broken local apic timer on AMD CPUs. 2007-08-11 15:58:13 -07:00
.gitignore
alternative.c i386: really stop MCEs during code patching 2007-08-11 15:58:13 -07:00
apic.c i386: Use global flag to disable broken local apic timer on AMD CPUs. 2007-08-11 15:58:13 -07:00
apm.c arch/i386/kernel/apm.c: apm_init() warning fix 2007-07-31 15:39:39 -07:00
asm-offsets.c lguest: the asm offsets 2007-07-19 10:04:52 -07:00
bootflag.c
cpuid.c Add suspend-related notifications for CPU hotplug 2007-05-09 12:30:56 -07:00
crash_dump.c
crash.c move die notifier handling to common code 2007-05-08 11:15:04 -07:00
doublefault.c i386: Fix double fault handler 2007-08-11 15:58:14 -07:00
e820.c Replace CONFIG_SOFTWARE_SUSPEND with CONFIG_HIBERNATION 2007-07-29 16:45:38 -07:00
early_printk.c
efi_stub.S
efi.c arch/i386/* fs/* ipc/*: mark variables with uninitialized_var() 2007-07-17 16:23:19 -04:00
entry.S i386: fixup TRACE_IRQ breakage 2007-07-18 12:09:01 -07:00
geode.c i386: basic infrastructure support for AMD geode-class machines 2007-07-21 18:37:14 -07:00
head.S i386: Fix start_kernel warning 2007-08-11 15:58:14 -07:00
hpet.c i386: hpet assumes boot cpu is 0 2007-07-21 18:37:14 -07:00
i386_ksyms.c [PATCH] i386: Convert PDA into the percpu section 2007-05-02 19:27:16 +02:00
i387.c
i8237.c
i8253.c i386: move PIT function declarations and constants to correct header file 2007-07-21 18:37:14 -07:00
i8259.c header cleaning: don't include smp_lock.h when not used 2007-05-08 11:15:07 -07:00
init_task.c use the new percpu interface for shared data 2007-07-19 10:04:45 -07:00
io_apic.c i386: remove old IRQ balancing debug cruft 2007-07-21 18:37:14 -07:00
ioport.c header cleaning: don't include smp_lock.h when not used 2007-05-08 11:15:07 -07:00
irq.c i386: Update alignment when 4K stacks are used. 2007-07-21 18:37:14 -07:00
kprobes.c x86: Fix alternatives and kprobes to remap write-protected kernel text 2007-07-22 11:03:37 -07:00
ldt.c header cleaning: don't include smp_lock.h when not used 2007-05-08 11:15:07 -07:00
machine_kexec.c
Makefile revert "x86, serial: convert legacy COM ports to platform devices" 2007-07-31 15:39:38 -07:00
mca.c [PATCH] i386: replace kmalloc+memset with kzalloc 2006-12-07 02:14:19 +01:00
microcode.c Remove fs.h from mm.h 2007-07-29 17:09:29 -07:00
module.c [PATCH] Generic BUG for i386 2006-12-08 08:28:39 -08:00
mpparse.c header cleaning: don't include smp_lock.h when not used 2007-05-08 11:15:07 -07:00
msr.c Add suspend-related notifications for CPU hotplug 2007-05-09 12:30:56 -07:00
nmi.c i386: Do not include other cpus' interrupt 0 in nmi_watchdog 2007-07-22 11:03:38 -07:00
numaq.c
paravirt.c i386: Make patching more robust, fix paravirt issue 2007-08-11 15:58:13 -07:00
pci-dma.c x86: Disable DAC on VIA bridges 2007-06-20 14:27:25 -07:00
pcspeaker.c [PATCH] x86: Unify pcspeaker platform device code between i386/x86-64 2007-02-13 13:26:26 +01:00
process.c x86: Make Alt-SysRq-p display the debug register contents 2007-07-21 18:37:10 -07:00
ptrace.c Handle bogus %cs selector in single-step instruction decoding 2007-07-18 12:09:01 -07:00
quirks.c Clean up E7520/7320/7525 quirk printk. 2007-07-07 13:53:13 -07:00
reboot_fixups.c GEODE: reboot fixup for geode machines with CS5536 boards 2007-07-06 11:45:11 -07:00
reboot.c i386: DMI_MATCH patch in reboot.c for SFF Dell OptiPlex 745 - fixes hang on reboot 2007-07-21 18:37:12 -07:00
relocate_kernel.S
scx200.c
setup.c ACPI: restore CONFIG_ACPI_SLEEP 2007-07-29 16:53:59 -07:00
sigframe.h
signal.c x86: i386-show-unhandled-signals-v3 2007-07-22 11:03:37 -07:00
smp.c paravirt: unstatic leave_mm 2007-07-18 08:47:41 -07:00
smpboot.c i386: Fix cpu_llc_id section mismatch warning 2007-07-22 11:03:37 -07:00
smpcommon.c i386: Allow smp_call_function_single() to current cpu 2007-07-16 12:05:50 +03:00
srat.c ACPI: build fix for IBM x440 - CONFIG_X86_SUMMIT 2007-02-02 21:47:33 -05:00
summit.c
sys_i386.c Remove fs.h from mm.h 2007-07-29 17:09:29 -07:00
syscall_table.S sys_fallocate() implementation on i386, x86_64 and powerpc 2007-07-17 21:42:44 -04:00
sysenter.c Remove fs.h from mm.h 2007-07-29 17:09:29 -07:00
time.c NTP: move the cmos update code into ntp.c 2007-07-21 17:49:15 -07:00
topology.c Replace remaining references to "driverfs" with "sysfs". 2007-02-17 19:13:42 +01:00
trampoline.S [PATCH] i386: Rename boot_gdt_table to boot_gdt 2007-05-02 19:27:10 +02:00
traps.c x86: Stop MCEs and NMIs during code patching 2007-07-22 11:03:37 -07:00
tsc_sync.c [PATCH] x86: rewrite SMP TSC sync code 2007-02-16 08:13:57 -08:00
tsc.c lguest: the host code 2007-07-19 10:04:52 -07:00
vm86.c header cleaning: don't include smp_lock.h when not used 2007-05-08 11:15:07 -07:00
vmi.c i386: Make patching more robust, fix paravirt issue 2007-08-11 15:58:13 -07:00
vmiclock.c i386: move PIT function declarations and constants to correct header file 2007-07-21 18:37:14 -07:00
vmlinux.lds.S i386: Put allocated ELF notes in read-only data segment 2007-07-19 10:04:47 -07:00
vsyscall-int80.S
vsyscall-note.S xen: disable vdso "nosegneg" on native boot 2007-07-20 08:44:19 -07:00
vsyscall-sigreturn.S
vsyscall-sysenter.S
vsyscall.lds.S [PATCH] i386: VDSO_PRELINK warning fix 2007-05-02 19:27:09 +02:00
vsyscall.S