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Subject[tip:perf/core] x86, NMI: Remove DIE_NMI_IPI
Commit-ID:  c410b8307702c1e1f35be3fd868ad18e4ba0410f
Gitweb: http://git.kernel.org/tip/c410b8307702c1e1f35be3fd868ad18e4ba0410f
Author: Don Zickus <dzickus@redhat.com>
AuthorDate: Thu, 6 Jan 2011 16:18:50 -0500
Committer: Ingo Molnar <mingo@elte.hu>
CommitDate: Fri, 7 Jan 2011 15:08:53 +0100

x86, NMI: Remove DIE_NMI_IPI

With priorities in place and no one really understanding the difference between
DIE_NMI and DIE_NMI_IPI, just remove DIE_NMI_IPI and convert everyone to DIE_NMI.

This also simplifies default_do_nmi() a little bit. Instead of calling the
die_notifier in both the if and else part, just pull it out and call it before
the if-statement. This has the side benefit of avoiding a call to the ioport
to see if there is an external NMI sitting around until after the (more frequent)
internal NMIs are dealt with.

Patch-Inspired-by: Huang Ying <ying.huang@intel.com>
Signed-off-by: Don Zickus <dzickus@redhat.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <1294348732-15030-5-git-send-email-dzickus@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---
arch/x86/include/asm/kdebug.h | 1 -
arch/x86/kernel/apic/hw_nmi.c | 1 -
arch/x86/kernel/cpu/mcheck/mce-inject.c | 3 ++-
arch/x86/kernel/cpu/perf_event.c | 1 -
arch/x86/kernel/kgdb.c | 4 ----
arch/x86/kernel/reboot.c | 3 ++-
arch/x86/kernel/traps.c | 19 ++++++++-----------
arch/x86/oprofile/nmi_int.c | 1 -
8 files changed, 12 insertions(+), 21 deletions(-)
diff --git a/arch/x86/include/asm/kdebug.h b/arch/x86/include/asm/kdebug.h
index f23eb25..ca242d3 100644
--- a/arch/x86/include/asm/kdebug.h
+++ b/arch/x86/include/asm/kdebug.h
@@ -18,7 +18,6 @@ enum die_val {
DIE_TRAP,
DIE_GPF,
DIE_CALL,
- DIE_NMI_IPI,
DIE_PAGE_FAULT,
DIE_NMIUNKNOWN,
};
diff --git a/arch/x86/kernel/apic/hw_nmi.c b/arch/x86/kernel/apic/hw_nmi.c
index 8bc49f1..79fd43c 100644
--- a/arch/x86/kernel/apic/hw_nmi.c
+++ b/arch/x86/kernel/apic/hw_nmi.c
@@ -68,7 +68,6 @@ arch_trigger_all_cpu_backtrace_handler(struct notifier_block *self,

switch (cmd) {
case DIE_NMI:
- case DIE_NMI_IPI:
break;

default:
diff --git a/arch/x86/kernel/cpu/mcheck/mce-inject.c b/arch/x86/kernel/cpu/mcheck/mce-inject.c
index 59546c1..a779719 100644
--- a/arch/x86/kernel/cpu/mcheck/mce-inject.c
+++ b/arch/x86/kernel/cpu/mcheck/mce-inject.c
@@ -25,6 +25,7 @@
#include <linux/gfp.h>
#include <asm/mce.h>
#include <asm/apic.h>
+#include <asm/nmi.h>

/* Update fake mce registers on current CPU. */
static void inject_mce(struct mce *m)
@@ -83,7 +84,7 @@ static int mce_raise_notify(struct notifier_block *self,
struct die_args *args = (struct die_args *)data;
int cpu = smp_processor_id();
struct mce *m = &__get_cpu_var(injectm);
- if (val != DIE_NMI_IPI || !cpumask_test_cpu(cpu, mce_inject_cpumask))
+ if (val != DIE_NMI || !cpumask_test_cpu(cpu, mce_inject_cpumask))
return NOTIFY_DONE;
cpumask_clear_cpu(cpu, mce_inject_cpumask);
if (m->inject_flags & MCJ_EXCEPTION)
diff --git a/arch/x86/kernel/cpu/perf_event.c b/arch/x86/kernel/cpu/perf_event.c
index 5e14b5e..c71bae4 100644
--- a/arch/x86/kernel/cpu/perf_event.c
+++ b/arch/x86/kernel/cpu/perf_event.c
@@ -1268,7 +1268,6 @@ perf_event_nmi_handler(struct notifier_block *self,

switch (cmd) {
case DIE_NMI:
- case DIE_NMI_IPI:
break;
case DIE_NMIUNKNOWN:
this_nmi = percpu_read(irq_stat.__nmi_count);
diff --git a/arch/x86/kernel/kgdb.c b/arch/x86/kernel/kgdb.c
index d43c841..a413000 100644
--- a/arch/x86/kernel/kgdb.c
+++ b/arch/x86/kernel/kgdb.c
@@ -526,10 +526,6 @@ static int __kgdb_notify(struct die_args *args, unsigned long cmd)
}
return NOTIFY_DONE;

- case DIE_NMI_IPI:
- /* Just ignore, we will handle the roundup on DIE_NMI. */
- return NOTIFY_DONE;
-
case DIE_NMIUNKNOWN:
if (was_in_debug_nmi[raw_smp_processor_id()]) {
was_in_debug_nmi[raw_smp_processor_id()] = 0;
diff --git a/arch/x86/kernel/reboot.c b/arch/x86/kernel/reboot.c
index 9c1c83e..fc7aae1 100644
--- a/arch/x86/kernel/reboot.c
+++ b/arch/x86/kernel/reboot.c
@@ -18,6 +18,7 @@
#include <asm/pci_x86.h>
#include <asm/virtext.h>
#include <asm/cpu.h>
+#include <asm/nmi.h>

#ifdef CONFIG_X86_32
# include <linux/ctype.h>
@@ -747,7 +748,7 @@ static int crash_nmi_callback(struct notifier_block *self,
{
int cpu;

- if (val != DIE_NMI_IPI)
+ if (val != DIE_NMI)
return NOTIFY_OK;

cpu = raw_smp_processor_id();
diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c
index c7fd1ce..23f6ac0 100644
--- a/arch/x86/kernel/traps.c
+++ b/arch/x86/kernel/traps.c
@@ -394,6 +394,14 @@ static notrace __kprobes void default_do_nmi(struct pt_regs *regs)
unsigned char reason = 0;
int cpu;

+ /*
+ * CPU-specific NMI must be processed before non-CPU-specific
+ * NMI, otherwise we may lose it, because the CPU-specific
+ * NMI can not be detected/processed on other CPUs.
+ */
+ if (notify_die(DIE_NMI, "nmi", regs, 0, 2, SIGINT) == NOTIFY_STOP)
+ return;
+
cpu = smp_processor_id();

/* Only the BSP gets external NMIs from the system. */
@@ -401,21 +409,10 @@ static notrace __kprobes void default_do_nmi(struct pt_regs *regs)
reason = get_nmi_reason();

if (!(reason & NMI_REASON_MASK)) {
- if (notify_die(DIE_NMI_IPI, "nmi_ipi", regs, reason, 2, SIGINT)
- == NOTIFY_STOP)
- return;
-
-#ifdef CONFIG_X86_LOCAL_APIC
- if (notify_die(DIE_NMI, "nmi", regs, reason, 2, SIGINT)
- == NOTIFY_STOP)
- return;
-#endif
unknown_nmi_error(reason, regs);

return;
}
- if (notify_die(DIE_NMI, "nmi", regs, reason, 2, SIGINT) == NOTIFY_STOP)
- return;

/* AK: following checks seem to be broken on modern chipsets. FIXME */
if (reason & NMI_REASON_SERR)
diff --git a/arch/x86/oprofile/nmi_int.c b/arch/x86/oprofile/nmi_int.c
index 6e84ea4..e77ea0b 100644
--- a/arch/x86/oprofile/nmi_int.c
+++ b/arch/x86/oprofile/nmi_int.c
@@ -65,7 +65,6 @@ static int profile_exceptions_notify(struct notifier_block *self,

switch (val) {
case DIE_NMI:
- case DIE_NMI_IPI:
if (ctr_running)
model->check_ctrs(args->regs, &__get_cpu_var(cpu_msrs));
else if (!nmi_enabled)

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