Commit 13cad985 authored by Thomas Gleixner's avatar Thomas Gleixner
Browse files

x86/entry: Convert reschedule interrupt to IDTENTRY_SYSVEC_SIMPLE 



The scheduler IPI does not need the full interrupt entry handling logic
when the entry is from kernel mode. Use IDTENTRY_SYSVEC_SIMPLE and spare
all the overhead.

Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
Acked-by: default avatarAndy Lutomirski <luto@kernel.org>
Link: https://lore.kernel.org/r/20200521202119.835425642@linutronix.de
parent cb09ea29

arch/x86/entry/entry_64.S

+0 −4
Original line number Diff line number Diff line
@@ -956,10 +956,6 @@ apicinterrupt3 \num \sym \do_sym 
POP_SECTION_IRQENTRY

.endm



#ifdef CONFIG_SMP

apicinterrupt RESCHEDULE_VECTOR			reschedule_interrupt		smp_reschedule_interrupt

#endif



/*

 * Reload gs selector with exception handling

 * edi:  new selector

arch/x86/include/asm/entry_arch.h

+0 −3
Original line number Diff line number Diff line
@@ -10,6 +10,3 @@ 
 * is no hardware IRQ pin equivalent for them, they are triggered

 * through the ICC by us (IPIs)

 */
 
#ifdef CONFIG_SMP

BUILD_INTERRUPT(reschedule_interrupt,RESCHEDULE_VECTOR)

#endif

arch/x86/include/asm/hw_irq.h

+0 −3
Original line number Diff line number Diff line
@@ -28,9 +28,6 @@ 
#include <asm/irq.h>

#include <asm/sections.h>



/* Interrupt handlers registered during init_IRQ */

extern asmlinkage void reschedule_interrupt(void);



#ifdef	CONFIG_X86_LOCAL_APIC

struct irq_data;

struct pci_dev;

arch/x86/include/asm/idtentry.h

+1 −0
Original line number Diff line number Diff line
@@ -600,6 +600,7 @@ DECLARE_IDTENTRY_SYSVEC(X86_PLATFORM_IPI_VECTOR, sysvec_x86_platform_ipi); 
#endif



#ifdef CONFIG_SMP

DECLARE_IDTENTRY(RESCHEDULE_VECTOR,			sysvec_reschedule_ipi);

DECLARE_IDTENTRY_SYSVEC(IRQ_MOVE_CLEANUP_VECTOR,	sysvec_irq_move_cleanup);

DECLARE_IDTENTRY_SYSVEC(REBOOT_VECTOR,			sysvec_reboot);

DECLARE_IDTENTRY_SYSVEC(CALL_FUNCTION_SINGLE_VECTOR,	sysvec_call_function_single);

arch/x86/include/asm/trace/common.h

+0 −4
Original line number Diff line number Diff line
@@ -5,12 +5,8 @@ 
DECLARE_STATIC_KEY_FALSE(trace_pagefault_key);

#define trace_pagefault_enabled()			\

	static_branch_unlikely(&trace_pagefault_key)

DECLARE_STATIC_KEY_FALSE(trace_resched_ipi_key);

#define trace_resched_ipi_enabled()			\

	static_branch_unlikely(&trace_resched_ipi_key)

#else

static inline bool trace_pagefault_enabled(void) { return false; }

static inline bool trace_resched_ipi_enabled(void) { return false; }

#endif



#endif