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softirq: Disable softirq stacks for RT

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Disable extra stacks for softirqs. We want to preempt softirqs and
having them on special IRQ-stack does not make this easier.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Thomas Gleixner
2011-07-18 13:59:17 +02:00
committed by jianlong.wang
parent 49848fa2d1
commit eb771fa19d
8 changed files with 15 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
arch/powerpc/kernel/irq.c
View File

@@ -766,6 +766,7 @@ void irq_ctx_init(void)
}
}
#ifndef CONFIG_PREEMPT_RT_FULL
void do_softirq_own_stack(void)
{
struct thread_info *curtp, *irqtp;
@@ -783,6 +784,7 @@ void do_softirq_own_stack(void)
if (irqtp->flags)
set_bits(irqtp->flags, &curtp->flags);
}
#endif
irq_hw_number_t virq_to_hw(unsigned int virq)
{

2
arch/powerpc/kernel/misc_32.S
View File

@@ -42,6 +42,7 @@
* We store the saved ksp_limit in the unused part
* of the STACK_FRAME_OVERHEAD
*/
#ifndef CONFIG_PREEMPT_RT_FULL
_GLOBAL(call_do_softirq)
mflr r0
stw r0,4(r1)
@@ -58,6 +59,7 @@ _GLOBAL(call_do_softirq)
stw r10,THREAD+KSP_LIMIT(r2)
mtlr r0
blr
#endif
/*
* void call_do_irq(struct pt_regs *regs, struct thread_info *irqtp);

2
arch/powerpc/kernel/misc_64.S
View File

@@ -32,6 +32,7 @@
.text
#ifndef CONFIG_PREEMPT_RT_FULL
_GLOBAL(call_do_softirq)
mflr r0
std r0,16(r1)
@@ -42,6 +43,7 @@ _GLOBAL(call_do_softirq)
ld r0,16(r1)
mtlr r0
blr
#endif
_GLOBAL(call_do_irq)
mflr r0

2
arch/sh/kernel/irq.c
View File

@@ -148,6 +148,7 @@ void irq_ctx_exit(int cpu)
hardirq_ctx[cpu] = NULL;
}
#ifndef CONFIG_PREEMPT_RT_FULL
void do_softirq_own_stack(void)
{
struct thread_info *curctx;
@@ -175,6 +176,7 @@ void do_softirq_own_stack(void)
"r5", "r6", "r7", "r8", "r9", "r15", "t", "pr"
);
}
#endif
#else
static inline void handle_one_irq(unsigned int irq)
{

2
arch/sparc/kernel/irq_64.c
View File

@@ -854,6 +854,7 @@ void __irq_entry handler_irq(int pil, struct pt_regs *regs)
set_irq_regs(old_regs);
}
#ifndef CONFIG_PREEMPT_RT_FULL
void do_softirq_own_stack(void)
{
void *orig_sp, *sp = softirq_stack[smp_processor_id()];
@@ -868,6 +869,7 @@ void do_softirq_own_stack(void)
__asm__ __volatile__("mov %0, %%sp"
: : "r" (orig_sp));
}
#endif
#ifdef CONFIG_HOTPLUG_CPU
void fixup_irqs(void)

2
arch/x86/entry/entry_64.S
View File

@@ -1084,6 +1084,7 @@ bad_gs:
jmp 2b
.previous
#ifndef CONFIG_PREEMPT_RT_FULL
/* Call softirq on interrupt stack. Interrupts are off. */
ENTRY(do_softirq_own_stack)
pushq %rbp
@@ -1094,6 +1095,7 @@ ENTRY(do_softirq_own_stack)
leaveq
ret
ENDPROC(do_softirq_own_stack)
#endif
#ifdef CONFIG_XEN
idtentry hypervisor_callback xen_do_hypervisor_callback has_error_code=0

2
arch/x86/kernel/irq_32.c
View File

@@ -130,6 +130,7 @@ void irq_ctx_init(int cpu)
cpu, per_cpu(hardirq_stack, cpu), per_cpu(softirq_stack, cpu));
}
#ifndef CONFIG_PREEMPT_RT_FULL
void do_softirq_own_stack(void)
{
struct irq_stack *irqstk;
@@ -146,6 +147,7 @@ void do_softirq_own_stack(void)
call_on_stack(__do_softirq, isp);
}
#endif
bool handle_irq(struct irq_desc *desc, struct pt_regs *regs)
{

2
include/linux/interrupt.h
View File

@@ -500,7 +500,7 @@ struct softirq_action
asmlinkage void do_softirq(void);
asmlinkage void __do_softirq(void);
#ifdef __ARCH_HAS_DO_SOFTIRQ
#if defined(__ARCH_HAS_DO_SOFTIRQ) && !defined(CONFIG_PREEMPT_RT_FULL)
void do_softirq_own_stack(void);
#else
static inline void do_softirq_own_stack(void)