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Message-ID: <4C80A62D.6050901@kernel.org>
Date: Fri, 03 Sep 2010 00:39:25 -0700
From: Yinghai Lu <yinghai@...nel.org>
To: Ingo Molnar <mingo@...e.hu>, hpa@...or.com,
linux-kernel@...r.kernel.org, tglx@...utronix.de
CC: dzickus@...hat.com, linux-tip-commits@...r.kernel.org
Subject: Re: [tip:perf/urgent] perf, x86: Fix accidentally ack'ing a second
event on intel perf counter
Can you put this into perf branch ?
Thanks
Yinghai
[PATCH] x86,nmi: move unknown_nmi_panic to traps.c
So we use it even LOCKUP_DETECTOR is defined.
need Robert/Peter/Don's patch...
that will keep unknown_nmi_panic to have same behavoir before hw nmi watchdog
Signed-off-by: Yinghai Lu <yinghai@...nel.org>
---
arch/x86/include/asm/nmi.h | 8 --------
arch/x86/kernel/apic/hw_nmi.c | 1 -
arch/x86/kernel/apic/nmi.c | 27 ---------------------------
arch/x86/kernel/traps.c | 29 ++++++++++++++++++++++++++++-
kernel/sysctl.c | 4 +++-
5 files changed, 31 insertions(+), 38 deletions(-)
Index: linux-2.6/arch/x86/kernel/apic/nmi.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/apic/nmi.c
+++ linux-2.6/arch/x86/kernel/apic/nmi.c
@@ -37,7 +37,6 @@
#include <asm/mach_traps.h>
-int unknown_nmi_panic;
int nmi_watchdog_enabled;
/* For reliability, we're prepared to waste bits here. */
@@ -483,23 +482,6 @@ static void disable_ioapic_nmi_watchdog(
on_each_cpu(stop_apic_nmi_watchdog, NULL, 1);
}
-static int __init setup_unknown_nmi_panic(char *str)
-{
- unknown_nmi_panic = 1;
- return 1;
-}
-__setup("unknown_nmi_panic", setup_unknown_nmi_panic);
-
-static int unknown_nmi_panic_callback(struct pt_regs *regs, int cpu)
-{
- unsigned char reason = get_nmi_reason();
- char buf[64];
-
- sprintf(buf, "NMI received for unknown reason %02x\n", reason);
- die_nmi(buf, regs, 1); /* Always panic here */
- return 0;
-}
-
/*
* proc handler for /proc/sys/kernel/nmi
*/
@@ -540,15 +522,6 @@ int proc_nmi_enabled(struct ctl_table *t
#endif /* CONFIG_SYSCTL */
-int do_nmi_callback(struct pt_regs *regs, int cpu)
-{
-#ifdef CONFIG_SYSCTL
- if (unknown_nmi_panic)
- return unknown_nmi_panic_callback(regs, cpu);
-#endif
- return 0;
-}
-
void arch_trigger_all_cpu_backtrace(void)
{
int i;
Index: linux-2.6/arch/x86/kernel/apic/hw_nmi.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/apic/hw_nmi.c
+++ linux-2.6/arch/x86/kernel/apic/hw_nmi.c
@@ -100,7 +100,6 @@ void acpi_nmi_disable(void) { return; }
#endif
atomic_t nmi_active = ATOMIC_INIT(0); /* oprofile uses this */
EXPORT_SYMBOL(nmi_active);
-int unknown_nmi_panic;
void cpu_nmi_set_wd_enabled(void) { return; }
void stop_apic_nmi_watchdog(void *unused) { return; }
void setup_apic_nmi_watchdog(void *unused) { return; }
Index: linux-2.6/arch/x86/kernel/traps.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/traps.c
+++ linux-2.6/arch/x86/kernel/traps.c
@@ -377,6 +377,33 @@ unknown_nmi_error(unsigned char reason,
printk(KERN_EMERG "Dazed and confused, but trying to continue\n");
}
+#if defined(CONFIG_SYSCTL) && defined(CONFIG_X86_LOCAL_APIC)
+int unknown_nmi_panic;
+static int __init setup_unknown_nmi_panic(char *str)
+{
+ unknown_nmi_panic = 1;
+ return 1;
+}
+__setup("unknown_nmi_panic", setup_unknown_nmi_panic);
+
+static int unknown_nmi_panic_callback(struct pt_regs *regs, int cpu)
+{
+ unsigned char reason = get_nmi_reason();
+ char buf[64];
+
+ sprintf(buf, "NMI received for unknown reason %02x\n", reason);
+ die_nmi(buf, regs, 1); /* Always panic here */
+ return 0;
+}
+
+static int do_nmi_callback(struct pt_regs *regs, int cpu)
+{
+ if (unknown_nmi_panic)
+ return unknown_nmi_panic_callback(regs, cpu);
+ return 0;
+}
+#endif
+
static notrace __kprobes void default_do_nmi(struct pt_regs *regs)
{
unsigned char reason = 0;
@@ -405,8 +432,8 @@ static notrace __kprobes void default_do
*/
if (nmi_watchdog_tick(regs, reason))
return;
- if (!do_nmi_callback(regs, cpu))
#endif /* !CONFIG_LOCKUP_DETECTOR */
+ if (!do_nmi_callback(regs, cpu))
unknown_nmi_error(reason, regs);
#else
unknown_nmi_error(reason, regs);
Index: linux-2.6/kernel/sysctl.c
===================================================================
--- linux-2.6.orig/kernel/sysctl.c
+++ linux-2.6/kernel/sysctl.c
@@ -739,7 +739,7 @@ static struct ctl_table kern_table[] = {
.extra2 = &one,
},
#endif
-#if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86) && !defined(CONFIG_LOCKUP_DETECTOR)
+#if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
{
.procname = "unknown_nmi_panic",
.data = &unknown_nmi_panic,
@@ -747,6 +747,8 @@ static struct ctl_table kern_table[] = {
.mode = 0644,
.proc_handler = proc_dointvec,
},
+#endif
+#if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86) && !defined(CONFIG_LOCKUP_DETECTOR)
{
.procname = "nmi_watchdog",
.data = &nmi_watchdog_enabled,
Index: linux-2.6/arch/x86/include/asm/nmi.h
===================================================================
--- linux-2.6.orig/arch/x86/include/asm/nmi.h
+++ linux-2.6/arch/x86/include/asm/nmi.h
@@ -7,14 +7,6 @@
#ifdef ARCH_HAS_NMI_WATCHDOG
-/**
- * do_nmi_callback
- *
- * Check to see if a callback exists and execute it. Return 1
- * if the handler exists and was handled successfully.
- */
-int do_nmi_callback(struct pt_regs *regs, int cpu);
-
extern void die_nmi(char *str, struct pt_regs *regs, int do_panic);
extern int check_nmi_watchdog(void);
#if !defined(CONFIG_LOCKUP_DETECTOR)
--
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