[PATCH v3 [resend] 15/18] smp, x86: kill SMP single function call interrupt

Jiang Liu
2013-12-15T16:46:28Z

Commit 9a46ad6d6df3b54 "smp: make smp_call_function_many() use logic
similar to smp_call_function_single()" has unified the way to handle
single and multiple cross-CPU function calls. Now only one interrupt
is needed for architecture specific code to support generic SMP function
call interfaces, so kill the redundant single function call interrupt.

Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Shaohua Li <shli@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Jiri Kosina <trivial@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Jeremy Fitzhardinge <jeremy@goop.org>
Cc: Sebastian Andrzej Siewior <sebastian@breakpoint.cc>
Cc: x86@kernel.org
Cc: xen-devel@lists.xensource.com
Cc: virtualization@lists.linux-foundation.org
Signed-off-by: Jiang Liu <liuj97@gmail.com>
---
arch/x86/include/asm/entry_arch.h | 1 -
arch/x86/include/asm/hw_irq.h | 3 ---
arch/x86/include/asm/irq_vectors.h | 7 +++----
arch/x86/include/asm/trace/irq_vectors.h | 6 ------
arch/x86/kernel/entry_64.S | 2 --
arch/x86/kernel/irqinit.c | 4 ----
arch/x86/kernel/smp.c | 24 +-----------------------
arch/x86/xen/smp.c | 1 -
8 files changed, 4 insertions(+), 44 deletions(-)

diff --git a/arch/x86/include/asm/entry_arch.h b/arch/x86/include/asm/entry_arch.h
index dc5fa66..9670cff 100644
--- a/arch/x86/include/asm/entry_arch.h
+++ b/arch/x86/include/asm/entry_arch.h
@@ -12,7 +12,6 @@
#ifdef CONFIG_SMP
BUILD_INTERRUPT(reschedule_interrupt,RESCHEDULE_VECTOR)
BUILD_INTERRUPT(call_function_interrupt,CALL_FUNCTION_VECTOR)
-BUILD_INTERRUPT(call_function_single_interrupt,CALL_FUNCTION_SINGLE_VECTOR)
BUILD_INTERRUPT3(irq_move_cleanup_interrupt, IRQ_MOVE_CLEANUP_VECTOR,
smp_irq_move_cleanup_interrupt)
BUILD_INTERRUPT3(reboot_interrupt, REBOOT_VECTOR, smp_reboot_interrupt)
diff --git a/arch/x86/include/asm/hw_irq.h b/arch/x86/include/asm/hw_irq.h
index cba45d9..66bacec 100644
--- a/arch/x86/include/asm/hw_irq.h
+++ b/arch/x86/include/asm/hw_irq.h
@@ -75,7 +75,6 @@ extern asmlinkage void reboot_interrupt(void);
extern asmlinkage void threshold_interrupt(void);

extern asmlinkage void call_function_interrupt(void);
-extern asmlinkage void call_function_single_interrupt(void);

#ifdef CONFIG_TRACING
/* Interrupt handlers registered during init_IRQ */
@@ -88,7 +87,6 @@ extern void trace_thermal_interrupt(void);
extern void trace_reschedule_interrupt(void);
extern void trace_threshold_interrupt(void);
extern void trace_call_function_interrupt(void);
-extern void trace_call_function_single_interrupt(void);
#define trace_irq_move_cleanup_interrupt irq_move_cleanup_interrupt
#define trace_reboot_interrupt reboot_interrupt
#define trace_kvm_posted_intr_ipi kvm_posted_intr_ipi
@@ -182,7 +180,6 @@ extern asmlinkage void smp_irq_move_cleanup_interrupt(void);
#ifdef CONFIG_SMP
extern __visible void smp_reschedule_interrupt(struct pt_regs *);
extern __visible void smp_call_function_interrupt(struct pt_regs *);
-extern __visible void smp_call_function_single_interrupt(struct pt_regs *);
extern __visible void smp_invalidate_interrupt(struct pt_regs *);
#endif

diff --git a/arch/x86/include/asm/irq_vectors.h b/arch/x86/include/asm/irq_vectors.h
index 5702d7e..98a302d 100644
--- a/arch/x86/include/asm/irq_vectors.h
+++ b/arch/x86/include/asm/irq_vectors.h
@@ -92,10 +92,9 @@
#define ERROR_APIC_VECTOR 0xfe
#define RESCHEDULE_VECTOR 0xfd
#define CALL_FUNCTION_VECTOR 0xfc
-#define CALL_FUNCTION_SINGLE_VECTOR 0xfb
-#define THERMAL_APIC_VECTOR 0xfa
-#define THRESHOLD_APIC_VECTOR 0xf9
-#define REBOOT_VECTOR 0xf8
+#define THERMAL_APIC_VECTOR 0xfb
+#define THRESHOLD_APIC_VECTOR 0xfa
+#define REBOOT_VECTOR 0xf9

/*
* Generic system vector for platform specific use
diff --git a/arch/x86/include/asm/trace/irq_vectors.h b/arch/x86/include/asm/trace/irq_vectors.h
index 4cab890..e672e20 100644
--- a/arch/x86/include/asm/trace/irq_vectors.h
+++ b/arch/x86/include/asm/trace/irq_vectors.h
@@ -89,12 +89,6 @@ TRACE_EVENT_PERF_PERM(irq_work_exit, is_sampling_event(p_event) ? -EPERM : 0);
DEFINE_IRQ_VECTOR_EVENT(call_function);

/*
- * call_function_single - called when entering/exiting a call function
- * single interrupt vector handler
- */
-DEFINE_IRQ_VECTOR_EVENT(call_function_single);
-
-/*
* threshold_apic - called when entering/exiting a threshold apic interrupt
* vector handler
*/
diff --git a/arch/x86/kernel/entry_64.S b/arch/x86/kernel/entry_64.S
index e21b078..8d5d21a 100644
--- a/arch/x86/kernel/entry_64.S
+++ b/arch/x86/kernel/entry_64.S
@@ -1182,8 +1182,6 @@ apicinterrupt THERMAL_APIC_VECTOR \
#endif

#ifdef CONFIG_SMP
-apicinterrupt CALL_FUNCTION_SINGLE_VECTOR \
- call_function_single_interrupt smp_call_function_single_interrupt
apicinterrupt CALL_FUNCTION_VECTOR \
call_function_interrupt smp_call_function_interrupt
apicinterrupt RESCHEDULE_VECTOR \
diff --git a/arch/x86/kernel/irqinit.c b/arch/x86/kernel/irqinit.c
index a2a1fbc..4aa1b8c 100644
--- a/arch/x86/kernel/irqinit.c
+++ b/arch/x86/kernel/irqinit.c
@@ -141,10 +141,6 @@ static void __init smp_intr_init(void)
/* IPI for generic function call */
alloc_intr_gate(CALL_FUNCTION_VECTOR, call_function_interrupt);

- /* IPI for generic single function call */
- alloc_intr_gate(CALL_FUNCTION_SINGLE_VECTOR,
- call_function_single_interrupt);
-
/* Low priority IPI to cleanup after moving an irq */
set_intr_gate(IRQ_MOVE_CLEANUP_VECTOR, irq_move_cleanup_interrupt);
set_bit(IRQ_MOVE_CLEANUP_VECTOR, used_vectors);
diff --git a/arch/x86/kernel/smp.c b/arch/x86/kernel/smp.c
index 7c3a5a6..f363dd2 100644
--- a/arch/x86/kernel/smp.c
+++ b/arch/x86/kernel/smp.c
@@ -129,7 +129,7 @@ static void native_smp_send_reschedule(int cpu)

void native_send_call_func_single_ipi(int cpu)
{
- apic->send_IPI_mask(cpumask_of(cpu), CALL_FUNCTION_SINGLE_VECTOR);
+ apic->send_IPI_mask(cpumask_of(cpu), CALL_FUNCTION_VECTOR);
}

void native_send_call_func_ipi(const struct cpumask *mask)
@@ -311,28 +311,6 @@ __visible void smp_trace_call_function_interrupt(struct pt_regs *regs)
exiting_irq();
}

-static inline void __smp_call_function_single_interrupt(void)
-{
- generic_smp_call_function_single_interrupt();
- inc_irq_stat(irq_call_count);
-}
-
-__visible void smp_call_function_single_interrupt(struct pt_regs *regs)
-{
- smp_entering_irq();
- __smp_call_function_single_interrupt();
- exiting_irq();
-}
-
-__visible void smp_trace_call_function_single_interrupt(struct pt_regs *regs)
-{
- smp_entering_irq();
- trace_call_function_single_entry(CALL_FUNCTION_SINGLE_VECTOR);
- __smp_call_function_single_interrupt();
- trace_call_function_single_exit(CALL_FUNCTION_SINGLE_VECTOR);
- exiting_irq();
-}
-
static int __init nonmi_ipi_setup(char *str)
{
smp_no_nmi_ipi = true;
diff --git a/arch/x86/xen/smp.c b/arch/x86/xen/smp.c
index 7cf1689..f241792 100644
--- a/arch/x86/xen/smp.c
+++ b/arch/x86/xen/smp.c
@@ -560,7 +560,6 @@ static inline int xen_map_vector(int vector)
xen_vector = XEN_RESCHEDULE_VECTOR;
break;
case CALL_FUNCTION_VECTOR:
- case CALL_FUNCTION_SINGLE_VECTOR:
xen_vector = XEN_CALL_FUNCTION_VECTOR;
break;
case IRQ_WORK_VECTOR:
--
1.8.1.2