[tip:x86/apic] x86/ipi: Make platform IPI depend on APIC

tip-bot for Thomas Gleixner
2017-08-29T11:15:54Z

Commit-ID: 0428e01a2f13a6b7dae8289fb10030dbea336dee
Gitweb: http://git.kernel.org/tip/0428e01a2f13a6b7dae8289fb10030dbea336dee
Author: Thomas Gleixner <tglx@linutronix.de>
AuthorDate: Mon, 28 Aug 2017 08:47:34 +0200
Committer: Ingo Molnar <mingo@kernel.org>
CommitDate: Tue, 29 Aug 2017 11:42:29 +0200

x86/ipi: Make platform IPI depend on APIC

The platform IPI vector is only installed when the local APIC is enabled. All
users of it depend on the local APIC anyway.

Make the related code conditional on CONFIG_X86_LOCAL_APIC=y.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Link: http://lkml.kernel.org/r/20170828064957.615286163@linutronix.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
arch/x86/include/asm/entry_arch.h | 3 +--
arch/x86/kernel/irq.c | 11 ++++++-----
2 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/arch/x86/include/asm/entry_arch.h b/arch/x86/include/asm/entry_arch.h
index c911650..aa15d1f 100644
--- a/arch/x86/include/asm/entry_arch.h
+++ b/arch/x86/include/asm/entry_arch.h
@@ -17,8 +17,6 @@ BUILD_INTERRUPT(irq_move_cleanup_interrupt, IRQ_MOVE_CLEANUP_VECTOR)
BUILD_INTERRUPT(reboot_interrupt, REBOOT_VECTOR)
#endif

-BUILD_INTERRUPT(x86_platform_ipi, X86_PLATFORM_IPI_VECTOR)
-
#ifdef CONFIG_HAVE_KVM
BUILD_INTERRUPT(kvm_posted_intr_ipi, POSTED_INTR_VECTOR)
BUILD_INTERRUPT(kvm_posted_intr_wakeup_ipi, POSTED_INTR_WAKEUP_VECTOR)
@@ -37,6 +35,7 @@ BUILD_INTERRUPT(kvm_posted_intr_nested_ipi, POSTED_INTR_NESTED_VECTOR)
BUILD_INTERRUPT(apic_timer_interrupt,LOCAL_TIMER_VECTOR)
BUILD_INTERRUPT(error_interrupt,ERROR_APIC_VECTOR)
BUILD_INTERRUPT(spurious_interrupt,SPURIOUS_APIC_VECTOR)
+BUILD_INTERRUPT(x86_platform_ipi, X86_PLATFORM_IPI_VECTOR)

#ifdef CONFIG_IRQ_WORK
BUILD_INTERRUPT(irq_work_interrupt, IRQ_WORK_VECTOR)
diff --git a/arch/x86/kernel/irq.c b/arch/x86/kernel/irq.c
index befdd4a..52089c0 100644
--- a/arch/x86/kernel/irq.c
+++ b/arch/x86/kernel/irq.c
@@ -29,9 +29,6 @@ EXPORT_PER_CPU_SYMBOL(irq_regs);

atomic_t irq_err_count;

-/* Function pointer for generic interrupt vector handling */
-void (*x86_platform_ipi_callback)(void) = NULL;
-
/*
* 'what should we do if we get a hw irq event on an illegal vector'.
* each architecture has to answer this themselves.
@@ -87,13 +84,13 @@ int arch_show_interrupts(struct seq_file *p, int prec)
for_each_online_cpu(j)
seq_printf(p, "%10u ", irq_stats(j)->icr_read_retry_count);
seq_puts(p, " APIC ICR read retries\n");
-#endif
if (x86_platform_ipi_callback) {
seq_printf(p, "%*s: ", prec, "PLT");
for_each_online_cpu(j)
seq_printf(p, "%10u ", irq_stats(j)->x86_platform_ipis);
seq_puts(p, " Platform interrupts\n");
}
+#endif
#ifdef CONFIG_SMP
seq_printf(p, "%*s: ", prec, "RES");
for_each_online_cpu(j)
@@ -183,9 +180,9 @@ u64 arch_irq_stat_cpu(unsigned int cpu)
sum += irq_stats(cpu)->apic_perf_irqs;
sum += irq_stats(cpu)->apic_irq_work_irqs;
sum += irq_stats(cpu)->icr_read_retry_count;
-#endif
if (x86_platform_ipi_callback)
sum += irq_stats(cpu)->x86_platform_ipis;
+#endif
#ifdef CONFIG_SMP
sum += irq_stats(cpu)->irq_resched_count;
sum += irq_stats(cpu)->irq_call_count;
@@ -259,6 +256,9 @@ __visible unsigned int __irq_entry do_IRQ(struct pt_regs *regs)
return 1;
}

+#ifdef CONFIG_X86_LOCAL_APIC
+/* Function pointer for generic interrupt vector handling */
+void (*x86_platform_ipi_callback)(void) = NULL;
/*
* Handler for X86_PLATFORM_IPI_VECTOR.
*/
@@ -275,6 +275,7 @@ __visible void __irq_entry smp_x86_platform_ipi(struct pt_regs *regs)
exiting_irq();
set_irq_regs(old_regs);
}
+#endif

#ifdef CONFIG_HAVE_KVM
static void dummy_handler(void) {}