linux-kernel - [tip:x86/apic] x86/irq: Get rid of duplicated trace_x86_platform

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Message-ID: <tip-8a17116b1fddc1f414cd4dd5e86fa239fcdb5208@git.kernel.org>
Date:   Tue, 29 Aug 2017 04:07:48 -0700
From:   tip-bot for Thomas Gleixner <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     rostedt@...dmis.org, linux-kernel@...r.kernel.org,
        mingo@...nel.org, peterz@...radead.org,
        torvalds@...ux-foundation.org, luto@...nel.org, bp@...en8.de,
        hpa@...or.com, tglx@...utronix.de
Subject: [tip:x86/apic] x86/irq: Get rid of duplicated
 trace_x86_platform_ipi() code

Commit-ID:  8a17116b1fddc1f414cd4dd5e86fa239fcdb5208
Gitweb:     http://git.kernel.org/tip/8a17116b1fddc1f414cd4dd5e86fa239fcdb5208
Author:     Thomas Gleixner <tglx@...utronix.de>
AuthorDate: Mon, 28 Aug 2017 08:47:25 +0200
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Tue, 29 Aug 2017 11:42:25 +0200

x86/irq: Get rid of duplicated trace_x86_platform_ipi() code

Two NOP5s are really a good tradeoff vs. the unholy IDT switching mess,
which duplicates code all over the place.

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Reviewed-by: Steven Rostedt (VMware) <rostedt@...dmis.org>
Cc: Andy Lutomirski <luto@...nel.org>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Link: http://lkml.kernel.org/r/20170828064956.907209383@linutronix.de
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/include/asm/hw_irq.h |  2 +-
 arch/x86/kernel/irq.c         | 25 +++++--------------------
 2 files changed, 6 insertions(+), 21 deletions(-)

diff --git a/arch/x86/include/asm/hw_irq.h b/arch/x86/include/asm/hw_irq.h
index 44137bb..a7e45d1 100644
--- a/arch/x86/include/asm/hw_irq.h
+++ b/arch/x86/include/asm/hw_irq.h
@@ -48,7 +48,6 @@ extern asmlinkage void call_function_single_interrupt(void);
 
 #ifdef CONFIG_TRACING
 /* Interrupt handlers registered during init_IRQ */
-extern void trace_x86_platform_ipi(void);
 extern void trace_error_interrupt(void);
 extern void trace_irq_work_interrupt(void);
 extern void trace_spurious_interrupt(void);
@@ -58,6 +57,7 @@ extern void trace_threshold_interrupt(void);
 extern void trace_deferred_error_interrupt(void);
 extern void trace_call_function_interrupt(void);
 extern void trace_call_function_single_interrupt(void);
+#define trace_x86_platform_ipi	x86_platform_ipi
 #define trace_apic_timer_interrupt	apic_timer_interrupt
 #define trace_irq_move_cleanup_interrupt  irq_move_cleanup_interrupt
 #define trace_reboot_interrupt  reboot_interrupt
diff --git a/arch/x86/kernel/irq.c b/arch/x86/kernel/irq.c
index 019d0ac..befdd4a 100644
--- a/arch/x86/kernel/irq.c
+++ b/arch/x86/kernel/irq.c
@@ -262,20 +262,16 @@ __visible unsigned int __irq_entry do_IRQ(struct pt_regs *regs)
 /*
  * Handler for X86_PLATFORM_IPI_VECTOR.
  */
-void __smp_x86_platform_ipi(void)
-{
-	inc_irq_stat(x86_platform_ipis);
-
-	if (x86_platform_ipi_callback)
-		x86_platform_ipi_callback();
-}
-
 __visible void __irq_entry smp_x86_platform_ipi(struct pt_regs *regs)
 {
 	struct pt_regs *old_regs = set_irq_regs(regs);
 
 	entering_ack_irq();
-	__smp_x86_platform_ipi();
+	trace_x86_platform_ipi_entry(X86_PLATFORM_IPI_VECTOR);
+	inc_irq_stat(x86_platform_ipis);
+	if (x86_platform_ipi_callback)
+		x86_platform_ipi_callback();
+	trace_x86_platform_ipi_exit(X86_PLATFORM_IPI_VECTOR);
 	exiting_irq();
 	set_irq_regs(old_regs);
 }
@@ -334,17 +330,6 @@ __visible void smp_kvm_posted_intr_nested_ipi(struct pt_regs *regs)
 }
 #endif
 
-__visible void __irq_entry smp_trace_x86_platform_ipi(struct pt_regs *regs)
-{
-	struct pt_regs *old_regs = set_irq_regs(regs);
-
-	entering_ack_irq();
-	trace_x86_platform_ipi_entry(X86_PLATFORM_IPI_VECTOR);
-	__smp_x86_platform_ipi();
-	trace_x86_platform_ipi_exit(X86_PLATFORM_IPI_VECTOR);
-	exiting_irq();
-	set_irq_regs(old_regs);
-}
 
 #ifdef CONFIG_HOTPLUG_CPU