From: Will Deacon <will.deacon@arm.com>
Date: Sun, 7 Apr 2013 09:36:11 +0000 (+1200)
Subject: alpha: irq: run all handlers with interrupts disabled
X-Git-Tag: accepted/tizen/common/20141203.182822~2539
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=e20800fd5cec2a75639a32e956b1cdc023cb87ce;p=platform%2Fkernel%2Flinux-arm64.git

alpha: irq: run all handlers with interrupts disabled

Linux has expected that interrupt handlers are executed with local
interrupts disabled for a while now, so ensure that this is the case on
Alpha even for non-device interrupts such as IPIs.

Without this patch, secondary boot results in the following backtrace:

  warning: at kernel/softirq.c:139 __local_bh_enable+0xb8/0xd0()
  trace:
    __local_bh_enable+0xb8/0xd0
    irq_enter+0x74/0xa0
    scheduler_ipi+0x50/0x100
    handle_ipi+0x84/0x260
    do_entint+0x1ac/0x2e0
    irq_exit+0x60/0xa0
    handle_irq+0x98/0x100
    do_entint+0x2c8/0x2e0
    ret_from_sys_call+0x0/0x10
    load_balance+0x3e4/0x870
    cpu_idle+0x24/0x80
    rcu_eqs_enter_common.isra.38+0x0/0x120
    cpu_idle+0x40/0x80
    rest_init+0xc0/0xe0
    _stext+0x1c/0x20

A similar dump occurs if you try to reboot using magic-sysrq.

Cc: Richard Henderson <rth@twiddle.net>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Cc: Matt Turner <mattst88@gmail.com>
Reviewed-by: Matt Turner <mattst88@gmail.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Michael Cree <mcree@orcon.net.nz>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/arch/alpha/kernel/irq.c b/arch/alpha/kernel/irq.c
index 2872acc..7b2be25 100644
--- a/arch/alpha/kernel/irq.c
+++ b/arch/alpha/kernel/irq.c
@@ -117,13 +117,6 @@ handle_irq(int irq)
 		return;
 	}
 
-	/*
-	 * From here we must proceed with IPL_MAX. Note that we do not
-	 * explicitly enable interrupts afterwards - some MILO PALcode
-	 * (namely LX164 one) seems to have severe problems with RTI
-	 * at IPL 0.
-	 */
-	local_irq_disable();
 	irq_enter();
 	generic_handle_irq_desc(irq, desc);
 	irq_exit();
diff --git a/arch/alpha/kernel/irq_alpha.c b/arch/alpha/kernel/irq_alpha.c
index 772ddfdb..1216dfb 100644
--- a/arch/alpha/kernel/irq_alpha.c
+++ b/arch/alpha/kernel/irq_alpha.c
@@ -45,6 +45,14 @@ do_entInt(unsigned long type, unsigned long vector,
 	  unsigned long la_ptr, struct pt_regs *regs)
 {
 	struct pt_regs *old_regs;
+
+	/*
+	 * Disable interrupts during IRQ handling.
+	 * Note that there is no matching local_irq_enable() due to
+	 * severe problems with RTI at IPL0 and some MILO PALcode
+	 * (namely LX164).
+	 */
+	local_irq_disable();
 	switch (type) {
 	case 0:
 #ifdef CONFIG_SMP
@@ -62,7 +70,6 @@ do_entInt(unsigned long type, unsigned long vector,
 	  {
 		long cpu;
 
-		local_irq_disable();
 		smp_percpu_timer_interrupt(regs);
 		cpu = smp_processor_id();
 		if (cpu != boot_cpuid) {