linux-kernel - [PATCH -tip] x86: do_IRQ - send EOI for x86-32 on irq without handler v2

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Message-ID: <20090408145017.GB7556@lenovo>
Date:	Wed, 8 Apr 2009 18:50:17 +0400
From:	Cyrill Gorcunov <gorcunov@...nvz.org>
To:	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Suresh Siddha <suresh.b.siddha@...el.com>
Subject: [PATCH -tip] x86: do_IRQ - send EOI for x86-32 on irq without
	handler v2

If IRQ has no handler it remains non-Ack'ed even if APIC is not
requested for being disabled. Fix it.

Signed-off-by: Cyrill Gorcunov <gorcunov@...nvz.org>
---

|more stuff needs fixing here first:
|
|arch/x86/kernel/irq.c: In function ‘do_IRQ’:
|arch/x86/kernel/irq.c:226: error: ‘disable_apic’ undeclared (first use in this
|function)
|arch/x86/kernel/irq.c:226: error: (Each undeclared identifier is reported only
|once
|arch/x86/kernel/irq.c:226: error: for each function it appears in.)
|
|like making 'disable_apic' available everywhere.
|
|Or better yet: introduce a dummy apic->write() method in the
|disable_apic=1 case so we can call a straight ack_APIC_irq().
|
|        Ingo

Ingo, I think introducing additional dummy here would be a bit
expencive -- a number of callers of ack_APIC_irq just should not
check for disable_apic since it's not needed. disable_apic is to
depend on CONFIG_X86_LOCAL_APIC rather then CONFIG_X86_64 actually.
So make it then. Or you mean something else? Like new apic->write_eoi
operation? (I'm a bit tired so brain is a half functional now :)

 arch/x86/kernel/irq.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

Index: linux-2.6.git/arch/x86/kernel/irq.c
=====================================================================
--- linux-2.6.git.orig/arch/x86/kernel/irq.c
+++ linux-2.6.git/arch/x86/kernel/irq.c
@@ -223,10 +223,10 @@ unsigned int __irq_entry do_IRQ(struct p
 	irq = __get_cpu_var(vector_irq)[vector];

 	if (!handle_irq(irq, regs)) {
-#ifdef CONFIG_X86_64
+#ifdef CONFIG_X86_LOCAL_APIC
 		if (!disable_apic)
-			ack_APIC_irq();
 #endif
+			ack_APIC_irq();

 		if (printk_ratelimit())
 			printk(KERN_EMERG "%s: %d.%d No irq handler for vector (irq %d)\n",
--
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