linux-kernel - [PATCH] x86/ioapic: Remove unused function IO_APIC_irq

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Date:   Mon, 22 May 2017 16:20:35 -0700
From:   Matthias Kaehlcke <mka@...omium.org>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H . Peter Anvin" <hpa@...or.com>
Cc:     x86@...nel.org, linux-kernel@...r.kernel.org,
        Douglas Anderson <dianders@...omium.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Matthias Kaehlcke <mka@...omium.org>
Subject: [PATCH] x86/ioapic: Remove unused function IO_APIC_irq_trigger()

The function isn't used since commit 5ad274d41c1b ("x86/irq: Remove
unused old IOAPIC irqdomain interfaces"). Removing it fixes the
following warning when building with clang:

arch/x86/kernel/apic/io_apic.c:1219:19: error: unused function
    'IO_APIC_irq_trigger' [-Werror,-Wunused-function]

Signed-off-by: Matthias Kaehlcke <mka@...omium.org>
---
Andrew, this is a practical example of clangs 'unused-function' warning
on static inline functions being useful.

 arch/x86/kernel/apic/io_apic.c | 22 ----------------------
 1 file changed, 22 deletions(-)

diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index 347bb9f65737..247880fc29f9 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -1200,28 +1200,6 @@ EXPORT_SYMBOL(IO_APIC_get_PCI_irq_vector);
 
 static struct irq_chip ioapic_chip, ioapic_ir_chip;
 
-#ifdef CONFIG_X86_32
-static inline int IO_APIC_irq_trigger(int irq)
-{
-	int apic, idx, pin;
-
-	for_each_ioapic_pin(apic, pin) {
-		idx = find_irq_entry(apic, pin, mp_INT);
-		if ((idx != -1) && (irq == pin_2_irq(idx, apic, pin, 0)))
-			return irq_trigger(idx);
-	}
-	/*
-         * nonexistent IRQs are edge default
-         */
-	return 0;
-}
-#else
-static inline int IO_APIC_irq_trigger(int irq)
-{
-	return 1;
-}
-#endif
-
 static void __init setup_IO_APIC_irqs(void)
 {
 	unsigned int ioapic, pin;
-- 
2.13.0.303.g4ebf302169-goog