Subject: softirq-disable-softirq-stacks-for-rt.patch
From: Thomas Gleixner <tglx@linutronix.de>
Date: Mon, 18 Jul 2011 13:59:17 +0200

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
 arch/powerpc/kernel/irq.c     |    3 ++-
 arch/powerpc/kernel/misc_32.S |    2 ++
 arch/powerpc/kernel/misc_64.S |    2 ++
 arch/sh/kernel/irq.c          |    2 ++
 arch/sparc/kernel/irq_64.c    |    2 ++
 arch/x86/kernel/entry_64.S    |    2 ++
 arch/x86/kernel/irq_32.c      |    2 ++
 arch/x86/kernel/irq_64.c      |    3 ++-
 include/linux/interrupt.h     |    3 +--
 9 files changed, 17 insertions(+), 4 deletions(-)

Index: linux-3.2/arch/powerpc/kernel/irq.c
===================================================================
--- linux-3.2.orig/arch/powerpc/kernel/irq.c
+++ linux-3.2/arch/powerpc/kernel/irq.c
@@ -443,6 +443,7 @@ void irq_ctx_init(void)
 	}
 }
 
+#ifndef CONFIG_PREEMPT_RT_FULL
 static inline void do_softirq_onstack(void)
 {
 	struct thread_info *curtp, *irqtp;
@@ -479,7 +480,7 @@ void do_softirq(void)
 
 	local_irq_restore(flags);
 }
-
+#endif
 
 /*
  * IRQ controller and virtual interrupts
Index: linux-3.2/arch/powerpc/kernel/misc_32.S
===================================================================
--- linux-3.2.orig/arch/powerpc/kernel/misc_32.S
+++ linux-3.2/arch/powerpc/kernel/misc_32.S
@@ -36,6 +36,7 @@
 
 	.text
 
+#ifndef CONFIG_PREEMPT_RT_FULL
 _GLOBAL(call_do_softirq)
 	mflr	r0
 	stw	r0,4(r1)
@@ -46,6 +47,7 @@ _GLOBAL(call_do_softirq)
 	lwz	r0,4(r1)
 	mtlr	r0
 	blr
+#endif
 
 _GLOBAL(call_handle_irq)
 	mflr	r0
Index: linux-3.2/arch/powerpc/kernel/misc_64.S
===================================================================
--- linux-3.2.orig/arch/powerpc/kernel/misc_64.S
+++ linux-3.2/arch/powerpc/kernel/misc_64.S
@@ -29,6 +29,7 @@
 
 	.text
 
+#ifndef CONFIG_PREEMPT_RT_FULL
 _GLOBAL(call_do_softirq)
 	mflr	r0
 	std	r0,16(r1)
@@ -39,6 +40,7 @@ _GLOBAL(call_do_softirq)
 	ld	r0,16(r1)
 	mtlr	r0
 	blr
+#endif
 
 _GLOBAL(call_handle_irq)
 	ld	r8,0(r6)
Index: linux-3.2/arch/sh/kernel/irq.c
===================================================================
--- linux-3.2.orig/arch/sh/kernel/irq.c
+++ linux-3.2/arch/sh/kernel/irq.c
@@ -149,6 +149,7 @@ void irq_ctx_exit(int cpu)
 	hardirq_ctx[cpu] = NULL;
 }
 
+#ifndef CONFIG_PREEMPT_RT_FULL
 asmlinkage void do_softirq(void)
 {
 	unsigned long flags;
@@ -191,6 +192,7 @@ asmlinkage void do_softirq(void)
 
 	local_irq_restore(flags);
 }
+#endif
 #else
 static inline void handle_one_irq(unsigned int irq)
 {
Index: linux-3.2/arch/sparc/kernel/irq_64.c
===================================================================
--- linux-3.2.orig/arch/sparc/kernel/irq_64.c
+++ linux-3.2/arch/sparc/kernel/irq_64.c
@@ -699,6 +699,7 @@ void __irq_entry handler_irq(int pil, st
 	set_irq_regs(old_regs);
 }
 
+#ifndef CONFIG_PREEMPT_RT_FULL
 void do_softirq(void)
 {
 	unsigned long flags;
@@ -724,6 +725,7 @@ void do_softirq(void)
 
 	local_irq_restore(flags);
 }
+#endif
 
 #ifdef CONFIG_HOTPLUG_CPU
 void fixup_irqs(void)
Index: linux-3.2/arch/x86/kernel/entry_64.S
===================================================================
--- linux-3.2.orig/arch/x86/kernel/entry_64.S
+++ linux-3.2/arch/x86/kernel/entry_64.S
@@ -1192,6 +1192,7 @@ ENTRY(kernel_execve)
 	CFI_ENDPROC
 END(kernel_execve)
 
+#ifndef CONFIG_PREEMPT_RT_FULL
 /* Call softirq on interrupt stack. Interrupts are off. */
 ENTRY(call_softirq)
 	CFI_STARTPROC
@@ -1211,6 +1212,7 @@ ENTRY(call_softirq)
 	ret
 	CFI_ENDPROC
 END(call_softirq)
+#endif
 
 #ifdef CONFIG_XEN
 zeroentry xen_hypervisor_callback xen_do_hypervisor_callback
Index: linux-3.2/arch/x86/kernel/irq_32.c
===================================================================
--- linux-3.2.orig/arch/x86/kernel/irq_32.c
+++ linux-3.2/arch/x86/kernel/irq_32.c
@@ -149,6 +149,7 @@ void __cpuinit irq_ctx_init(int cpu)
 	       cpu, per_cpu(hardirq_ctx, cpu),  per_cpu(softirq_ctx, cpu));
 }
 
+#ifndef CONFIG_PREEMPT_RT_FULL
 asmlinkage void do_softirq(void)
 {
 	unsigned long flags;
@@ -179,6 +180,7 @@ asmlinkage void do_softirq(void)
 
 	local_irq_restore(flags);
 }
+#endif
 
 bool handle_irq(unsigned irq, struct pt_regs *regs)
 {
Index: linux-3.2/arch/x86/kernel/irq_64.c
===================================================================
--- linux-3.2.orig/arch/x86/kernel/irq_64.c
+++ linux-3.2/arch/x86/kernel/irq_64.c
@@ -65,7 +65,7 @@ bool handle_irq(unsigned irq, struct pt_
 	return true;
 }
 
-
+#ifndef CONFIG_PREEMPT_RT_FULL
 extern void call_softirq(void);
 
 asmlinkage void do_softirq(void)
@@ -85,3 +85,4 @@ asmlinkage void do_softirq(void)
 	}
 	local_irq_restore(flags);
 }
+#endif
Index: linux-3.2/include/linux/interrupt.h
===================================================================
--- linux-3.2.orig/include/linux/interrupt.h
+++ linux-3.2/include/linux/interrupt.h
@@ -456,10 +456,9 @@ struct softirq_action
 	void	(*action)(struct softirq_action *);
 };
 
+#ifndef CONFIG_PREEMPT_RT_FULL
 asmlinkage void do_softirq(void);
 asmlinkage void __do_softirq(void);
-
-#ifndef CONFIG_PREEMPT_RT_FULL
 static inline void thread_do_softirq(void) { do_softirq(); }
 #else
 extern void thread_do_softirq(void);