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  1. 18 1月, 2009 1 次提交
  3. 06 1月, 2009 1 次提交
  5. 03 1月, 2009 1 次提交
  7. 31 10月, 2008 1 次提交
  9. 28 10月, 2008 2 次提交
  11. 23 9月, 2008 1 次提交
    • A
      x86, NMI watchdog: setup before enabling NMI watchdog · b3e15bde
      由 Aristeu Rozanski 提交于 
      There's a small window when NMI watchdog is being set up that if any NMIs
are triggered, the NMI code will make make use of not initalized wd_ops
elements:
	void setup_apic_nmi_watchdog(void *unused)
	{
		if (__get_cpu_var(wd_enabled))
			return;

		/* cheap hack to support suspend/resume */
		/* if cpu0 is not active neither should the other cpus */
		if (smp_processor_id() != 0 && atomic_read(&nmi_active) <= 0)
			return;

		switch (nmi_watchdog) {
		case NMI_LOCAL_APIC:
			/* enable it before to avoid race with handler */
-->			__get_cpu_var(wd_enabled) = 1;
-->			if (lapic_watchdog_init(nmi_hz) < 0) {
(...)
	asmlinkage notrace __kprobes void default_do_nmi(struct pt_regs *regs)
	{
	(...)
			if (nmi_watchdog_tick(regs, reason))
				return;
(...)
	notrace __kprobes int
	nmi_watchdog_tick(struct pt_regs *regs, unsigned reason)
	{
	(...)
		if (!__get_cpu_var(wd_enabled))
			return rc;
		switch (nmi_watchdog) {
		case NMI_LOCAL_APIC:
			rc |= lapic_wd_event(nmi_hz);
(...)
int lapic_wd_event(unsigned nmi_hz)
{
	struct nmi_watchdog_ctlblk *wd = &__get_cpu_var(nmi_watchdog_ctlblk);
	u64 ctr;

-->	rdmsrl(wd->perfctr_msr, ctr);

and wd->*_msr will be initialized on each processor type specific setup, after
enabling NMIs for PMIs. Since the counter was just set, the chances of an
performance counter generated NMI is minimal, but any other unknown NMI would
trigger the problem. This patch fixes the problem by setting everything up
before enabling performance counter generated NMIs and will set wd_enabled
using a callback function.
Signed-off-by: NAristeu Rozanski <aris@redhat.com>
Acked-by: NDon Zickus <dzickus@redhat.com>
Acked-by: NPrarit Bhargava <prarit@redhat.com>
Acked-by: NVivek Goyal <vgoyal@redhat.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>
      b3e15bde
  13. 15 8月, 2008 2 次提交
    • I
      x86, nmi: clean UP NMI watchdog failure message · 8bb85190
      由 Ingo Molnar 提交于 
      clean up the failure message - and redirect people to bugzilla
instead of lkml.
Signed-off-by: NIngo Molnar <mingo@elte.hu>
      8bb85190
    • A
      x86, NMI: fix watchdog failure message · 15636668
      由 Aristeu Rozanski 提交于 
      > it just won't work at boot time - the second logic unit will be stuck:
>
> Booting processor 1/2 APIC 0x1
> Initializing CPU#1
> Calibrating delay using timer specific routine.. 5586.12 BogoMIPS (lpj=2793063)
> CPU: Trace cache: 12K uops, L1 D cache: 16K
> CPU: L2 cache: 1024K
> CPU: Physical Processor ID: 0
> CPU: Processor Core ID: 1
> CPU1: Thermal monitoring enabled (TM1)
>               Intel(R) Pentium(R) D CPU 2.80GHz stepping 04
> Brought up 2 CPUs
> testing NMI watchdog ... <4>WARNING: CPU#1: NMI appears to be stuck (0->0)!

while at it... - fix that newline
Signed-off-by: NAristeu Rozanski <aris@redhat.com>
Cc: jvillalo@redhat.com
Signed-off-by: NIngo Molnar <mingo@elte.hu>
      15636668
  15. 20 7月, 2008 1 次提交
  17. 18 7月, 2008 1 次提交
    • M
      x86: APIC: remove apic_write_around(); use alternatives · 593f4a78
      由 Maciej W. Rozycki 提交于 
      Use alternatives to select the workaround for the 11AP Pentium erratum
for the affected steppings on the fly rather than build time.  Remove the
X86_GOOD_APIC configuration option and replace all the calls to
apic_write_around() with plain apic_write(), protecting accesses to the
ESR as appropriate due to the 3AP Pentium erratum.  Remove
apic_read_around() and all its invocations altogether as not needed.
Remove apic_write_atomic() and all its implementing backends.  The use of
ASM_OUTPUT2() is not strictly needed for input constraints, but I have
used it for readability's sake.

I had the feeling no one else was brave enough to do it, so I went ahead
and here it is.  Verified by checking the generated assembly and tested
with both a 32-bit and a 64-bit configuration, also with the 11AP
"feature" forced on and verified with gdb on /proc/kcore to work as
expected (as an 11AP machines are quite hard to get hands on these days).
Some script complained about the use of "volatile", but apic_write() needs
it for the same reason and is effectively a replacement for writel(), so I
have disregarded it.

I am not sure what the policy wrt defconfig files is, they are generated
and there is risk of a conflict resulting from an unrelated change, so I
have left changes to them out.  The option will get removed from them at
the next run.

Some testing with machines other than mine will be needed to avoid some
stupid mistake, but despite its volume, the change is not really that
intrusive, so I am fairly confident that because it works for me, it will
everywhere.
Signed-off-by: NMaciej W. Rozycki <macro@linux-mips.org>
Signed-off-by: NIngo Molnar <mingo@elte.hu>
      593f4a78
  19. 12 7月, 2008 1 次提交
  21. 08 7月, 2008 3 次提交
  23. 19 6月, 2008 1 次提交
  25. 12 6月, 2008 1 次提交
  27. 05 6月, 2008 2 次提交
    • M
      x86, nmi: fix build · 75b9f5d2
      由 mingo@elte.hu 提交于 
      fix:

arch/x86/kernel/built-in.o: In function `proc_nmi_enabled':
: undefined reference to `nmi_watchdog_default'
arch/x86/kernel/built-in.o: In function `native_smp_prepare_cpus':
: undefined reference to `nmi_watchdog_default'
Signed-off-by: NIngo Molnar <mingo@elte.hu>
      75b9f5d2
    • C
      x86: nmi - consolidate nmi_watchdog_default for 32bit mode · 3ed3f062
      由 Cyrill Gorcunov 提交于 
      64bit mode bootstrap code does set nmi_watchdog to NMI_NONE
by default and doing the same on 32bit mode is safe too.
Such an action saves us from several #ifdef.

Btw, my previous commit

commit 19ec673c
Author: Cyrill Gorcunov <gorcunov@gmail.com>
Date:   Wed May 28 23:00:47 2008 +0400

    x86: nmi - fix incorrect NMI watchdog used by default

did not fix the problem completely, moreover it
introduced additional bug - nmi_watchdog would be
set to either NMI_LOCAL_APIC or NMI_IO_APIC
_regardless_ to boot option if being enabled thru
/proc/sys/kernel/nmi_watchdog. Sorry for that.
Fix it too.
Signed-off-by: NCyrill Gorcunov <gorcunov@gmail.com>
Cc: mingo@redhat.com
Cc: hpa@zytor.com
Cc: macro@linux-mips.org
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>
      3ed3f062
  29. 02 6月, 2008 2 次提交
  31. 29 5月, 2008 1 次提交
  33. 26 5月, 2008 8 次提交
  35. 13 5月, 2008 1 次提交
  37. 20 4月, 2008 1 次提交
  39. 17 4月, 2008 4 次提交
  41. 19 2月, 2008 1 次提交
  43. 30 1月, 2008 1 次提交
  45. 25 1月, 2008 1 次提交
  47. 22 1月, 2008 1 次提交