The patch titled
x86 nmi fix
has been removed from the -mm tree. Its filename is
x86-nmi-fix.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
Subject: x86 nmi fix
From: Shaohua Li <shaohua.li@xxxxxxxxx>
Making NMI suspend/resume work with SMP. We use CPU hotplug to offline APs in
SMP suspend/resume. Only BSP executes sysdev's .suspend/.resume method. APs
should follow CPU hotplug code path.
Signed-off-by: Shaohua Li <shaohua.li@xxxxxxxxx>
Cc: Don Zickus <dzickus@xxxxxxxxxx>
Cc: Andi Kleen <ak@xxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
arch/i386/kernel/nmi.c | 14 +++++++++-----
arch/i386/kernel/smpboot.c | 3 ++-
arch/x86_64/kernel/nmi.c | 14 +++++++++-----
arch/x86_64/kernel/smpboot.c | 2 ++
include/asm-i386/nmi.h | 1 +
include/asm-x86_64/nmi.h | 1 +
6 files changed, 24 insertions(+), 11 deletions(-)
diff -puN arch/i386/kernel/nmi.c~x86-nmi-fix arch/i386/kernel/nmi.c
--- a/arch/i386/kernel/nmi.c~x86-nmi-fix
+++ a/arch/i386/kernel/nmi.c
@@ -65,7 +65,6 @@ struct nmi_watchdog_ctlblk {
static DEFINE_PER_CPU(struct nmi_watchdog_ctlblk, nmi_watchdog_ctlblk);
/* local prototypes */
-static void stop_apic_nmi_watchdog(void *unused);
static int unknown_nmi_panic_callback(struct pt_regs *regs, int cpu);
extern void show_registers(struct pt_regs *regs);
@@ -376,15 +375,20 @@ static int nmi_pm_active; /* nmi_active
static int lapic_nmi_suspend(struct sys_device *dev, pm_message_t state)
{
+ /* only CPU0 goes here, other CPUs should be offline */
nmi_pm_active = atomic_read(&nmi_active);
- disable_lapic_nmi_watchdog();
+ stop_apic_nmi_watchdog(NULL);
+ BUG_ON(atomic_read(&nmi_active) != 0);
return 0;
}
static int lapic_nmi_resume(struct sys_device *dev)
{
- if (nmi_pm_active > 0)
- enable_lapic_nmi_watchdog();
+ /* only CPU0 goes here, other CPUs should be offline */
+ if (nmi_pm_active > 0) {
+ setup_apic_nmi_watchdog(NULL);
+ touch_nmi_watchdog();
+ }
return 0;
}
@@ -786,7 +790,7 @@ void setup_apic_nmi_watchdog (void *unus
atomic_inc(&nmi_active);
}
-static void stop_apic_nmi_watchdog(void *unused)
+void stop_apic_nmi_watchdog(void *unused)
{
/* only support LOCAL and IO APICs for now */
if ((nmi_watchdog != NMI_LOCAL_APIC) &&
diff -puN arch/i386/kernel/smpboot.c~x86-nmi-fix arch/i386/kernel/smpboot.c
--- a/arch/i386/kernel/smpboot.c~x86-nmi-fix
+++ a/arch/i386/kernel/smpboot.c
@@ -1358,7 +1358,8 @@ int __cpu_disable(void)
*/
if (cpu == 0)
return -EBUSY;
-
+ if (nmi_watchdog == NMI_LOCAL_APIC)
+ stop_apic_nmi_watchdog(NULL);
clear_local_APIC();
/* Allow any queued timer interrupts to get serviced */
local_irq_enable();
diff -puN arch/x86_64/kernel/nmi.c~x86-nmi-fix arch/x86_64/kernel/nmi.c
--- a/arch/x86_64/kernel/nmi.c~x86-nmi-fix
+++ a/arch/x86_64/kernel/nmi.c
@@ -65,7 +65,6 @@ struct nmi_watchdog_ctlblk {
static DEFINE_PER_CPU(struct nmi_watchdog_ctlblk, nmi_watchdog_ctlblk);
/* local prototypes */
-static void stop_apic_nmi_watchdog(void *unused);
static int unknown_nmi_panic_callback(struct pt_regs *regs, int cpu);
/* converts an msr to an appropriate reservation bit */
@@ -362,15 +361,20 @@ static int nmi_pm_active; /* nmi_active
static int lapic_nmi_suspend(struct sys_device *dev, pm_message_t state)
{
+ /* only CPU0 goes here, other CPUs should be offline */
nmi_pm_active = atomic_read(&nmi_active);
- disable_lapic_nmi_watchdog();
+ stop_apic_nmi_watchdog(NULL);
+ BUG_ON(atomic_read(&nmi_active) != 0);
return 0;
}
static int lapic_nmi_resume(struct sys_device *dev)
{
- if (nmi_pm_active > 0)
- enable_lapic_nmi_watchdog();
+ /* only CPU0 goes here, other CPUs should be offline */
+ if (nmi_pm_active > 0) {
+ setup_apic_nmi_watchdog(NULL);
+ touch_nmi_watchdog();
+ }
return 0;
}
@@ -697,7 +701,7 @@ void setup_apic_nmi_watchdog(void *unuse
atomic_inc(&nmi_active);
}
-static void stop_apic_nmi_watchdog(void *unused)
+void stop_apic_nmi_watchdog(void *unused)
{
/* only support LOCAL and IO APICs for now */
if ((nmi_watchdog != NMI_LOCAL_APIC) &&
diff -puN arch/x86_64/kernel/smpboot.c~x86-nmi-fix arch/x86_64/kernel/smpboot.c
--- a/arch/x86_64/kernel/smpboot.c~x86-nmi-fix
+++ a/arch/x86_64/kernel/smpboot.c
@@ -1229,6 +1229,8 @@ int __cpu_disable(void)
if (cpu == 0)
return -EBUSY;
+ if (nmi_watchdog == NMI_LOCAL_APIC)
+ stop_apic_nmi_watchdog(NULL);
clear_local_APIC();
/*
diff -puN include/asm-i386/nmi.h~x86-nmi-fix include/asm-i386/nmi.h
--- a/include/asm-i386/nmi.h~x86-nmi-fix
+++ a/include/asm-i386/nmi.h
@@ -23,6 +23,7 @@ extern int reserve_evntsel_nmi(unsigned
extern void release_evntsel_nmi(unsigned int);
extern void setup_apic_nmi_watchdog (void *);
+extern void stop_apic_nmi_watchdog (void *);
extern void disable_timer_nmi_watchdog(void);
extern void enable_timer_nmi_watchdog(void);
extern int nmi_watchdog_tick (struct pt_regs * regs, unsigned reason);
diff -puN include/asm-x86_64/nmi.h~x86-nmi-fix include/asm-x86_64/nmi.h
--- a/include/asm-x86_64/nmi.h~x86-nmi-fix
+++ a/include/asm-x86_64/nmi.h
@@ -54,6 +54,7 @@ extern int reserve_evntsel_nmi(unsigned
extern void release_evntsel_nmi(unsigned int);
extern void setup_apic_nmi_watchdog (void *);
+extern void stop_apic_nmi_watchdog (void *);
extern void disable_timer_nmi_watchdog(void);
extern void enable_timer_nmi_watchdog(void);
extern int nmi_watchdog_tick (struct pt_regs * regs, unsigned reason);
_
Patches currently in -mm which might be from shaohua.li@xxxxxxxxx are
origin.patch
x86-cpu_init-avoid-gfp_kernel-allocation-while-atomic.patch
fix-swsuspend-breakage.patch
x86_64-fix-swsuspend-breakage.patch
-
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