linux-kernel - Re: 2.6.19-rc1 genirq causes either boot hang or "do

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Message-Id: <20061006124213.28afb767.akpm@osdl.org>
Date:	Fri, 6 Oct 2006 12:42:13 -0700
From:	Andrew Morton <akpm@...l.org>
To:	Andrew Vasquez <andrew.vasquez@...gic.com>
Cc:	Muli Ben-Yehuda <muli@...ibm.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Rajesh Shah <rajesh.shah@...el.com>, Andi Kleen <ak@....de>,
	"Protasevich, Natalie" <Natalie.Protasevich@...SYS.com>,
	"Luck, Tony" <tony.luck@...el.com>,
	Linus Torvalds <torvalds@...l.org>,
	Linux-Kernel <linux-kernel@...r.kernel.org>,
	Badari Pulavarty <pbadari@...il.com>
Subject: Re: 2.6.19-rc1 genirq causes either boot hang or "do_IRQ: cannot
 handle IRQ -1"

On Fri, 6 Oct 2006 12:00:39 -0700
Andrew Vasquez <andrew.vasquez@...gic.com> wrote:

> [   27.510539] Booting processor 1/2 APIC 0x1
> [   27.514684] Unable to handle kernel NULL pointer dereference at 0000000000000088 RIP: 
> [   27.520204]  [<ffffffff80225fb0>] profile_tick+0x40/0x90
> [   27.528118] PGD 0 
> [   27.530222] Oops: 0000 [1] SMP 
> [   27.533505] CPU 0 
> [   27.535610] Modules linked in:
> [   27.538755] Pid: 1, comm: swapper Not tainted 2.6.19-rc1 #5
> [   27.544367] RIP: 0010:[<ffffffff80225fb0>]  [<ffffffff80225fb0>] profile_tick+0x40/0x90
> [   27.552483] RSP: 0000:ffffffff8059ff78  EFLAGS: 00010046
> [   27.557842] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001
> [   27.565024] RDX: ffff810081a77f40 RSI: 0000000000000046 RDI: 0000000000000001
> [   27.572203] RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000007


hm, we seem to have broken x86_64 completely.

smp_apic_timer_interrupt() needs to do

	struct pt_regs *old_regs = set_irq_regs(regs);

on entry and

	set_irq_regs(old_regs);

on exit.

But it doesn't get passed the pt_regs*

>From my reading of `macro apicinterrupt' in arch/x86_64/kernel/entry.S,
smp_apic_timer_interrupt() actually _does_ get passed the pt_reg*, only it
doesn't declare it.  I think - Andi would need to confirm.

If I'm right...


diff -puN arch/x86_64/kernel/apic.c~x86_64-irq_regs-fix arch/x86_64/kernel/apic.c
--- a/arch/x86_64/kernel/apic.c~x86_64-irq_regs-fix
+++ a/arch/x86_64/kernel/apic.c
@@ -913,8 +913,10 @@ void smp_local_timer_interrupt(void)
  * [ if a single-CPU system runs an SMP kernel then we call the local
  *   interrupt as well. Thus we cannot inline the local irq ... ]
  */
-void smp_apic_timer_interrupt(void)
+void smp_apic_timer_interrupt(struct pt_regs *regs)
 {
+	struct pt_regs *old_regs = set_irq_regs(regs);
+
 	/*
 	 * the NMI deadlock-detector uses this.
 	 */
@@ -934,6 +936,7 @@ void smp_apic_timer_interrupt(void)
 	irq_enter();
 	smp_local_timer_interrupt();
 	irq_exit();
+	set_irq_regs(old_regs);
 }
 
 /*
_


-
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