linux-kernel - [tip:x86/apic] x86/irq_work: Make it depend on APIC

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Date:   Tue, 29 Aug 2017 04:11:35 -0700
From:   tip-bot for Thomas Gleixner <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     peterz@...radead.org, mingo@...nel.org,
        linux-kernel@...r.kernel.org, luto@...nel.org, rostedt@...dmis.org,
        bp@...en8.de, tglx@...utronix.de, torvalds@...ux-foundation.org,
        hpa@...or.com
Subject: [tip:x86/apic] x86/irq_work: Make it depend on APIC

Commit-ID:  a45525b5b47c10c0446eda21227792b39af233dc
Gitweb:     http://git.kernel.org/tip/a45525b5b47c10c0446eda21227792b39af233dc
Author:     Thomas Gleixner <tglx@...utronix.de>
AuthorDate: Mon, 28 Aug 2017 08:47:35 +0200
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Tue, 29 Aug 2017 11:42:30 +0200

x86/irq_work: Make it depend on APIC

The irq work interrupt vector is only installed when CONFIG_X86_LOCAL_APIC is
enabled, but the interrupt handler is compiled in unconditionally.

Compile the cruft out when the APIC is disabled.

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
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>
Cc: Steven Rostedt <rostedt@...dmis.org>
Link: http://lkml.kernel.org/r/20170828064957.691909010@linutronix.de
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/include/asm/irq_work.h | 8 ++++++++
 arch/x86/kernel/irq_work.c      | 4 ++--
 2 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/arch/x86/include/asm/irq_work.h b/arch/x86/include/asm/irq_work.h
index f706041..ddbb8ea 100644
--- a/arch/x86/include/asm/irq_work.h
+++ b/arch/x86/include/asm/irq_work.h
@@ -3,9 +3,17 @@
 
 #include <asm/cpufeature.h>
 
+#ifdef CONFIG_X86_LOCAL_APIC
 static inline bool arch_irq_work_has_interrupt(void)
 {
 	return boot_cpu_has(X86_FEATURE_APIC);
 }
+extern void arch_irq_work_raise(void);
+#else
+static inline bool arch_irq_work_has_interrupt(void)
+{
+	return false;
+}
+#endif
 
 #endif /* _ASM_IRQ_WORK_H */
diff --git a/arch/x86/kernel/irq_work.c b/arch/x86/kernel/irq_work.c
index 8054cae..70dee05 100644
--- a/arch/x86/kernel/irq_work.c
+++ b/arch/x86/kernel/irq_work.c
@@ -11,6 +11,7 @@
 #include <asm/trace/irq_vectors.h>
 #include <linux/interrupt.h>
 
+#ifdef CONFIG_X86_LOCAL_APIC
 __visible void __irq_entry smp_irq_work_interrupt(struct pt_regs *regs)
 {
 	ipi_entering_ack_irq();
@@ -23,11 +24,10 @@ __visible void __irq_entry smp_irq_work_interrupt(struct pt_regs *regs)
 
 void arch_irq_work_raise(void)
 {
-#ifdef CONFIG_X86_LOCAL_APIC
 	if (!arch_irq_work_has_interrupt())
 		return;
 
 	apic->send_IPI_self(IRQ_WORK_VECTOR);
 	apic_wait_icr_idle();
-#endif
 }
+#endif