mirror of
https://github.com/torvalds/linux.git
synced 2024-12-28 05:41:55 +00:00
7a7732bc0f
There is no reason to have different fixup_irqs() for 32-bit and 64-bit kernels. Unify by using the superior 64-bit version for both the kernels. Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com> Signed-off-by: Gary Hade <garyhade@us.ibm.com> Cc: Eric W. Biederman <ebiederm@xmission.com> LKML-Reference: <20091026230001.562512739@sbs-t61.sc.intel.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
85 lines
1.9 KiB
C
85 lines
1.9 KiB
C
/*
|
|
* Copyright (C) 1992, 1998 Linus Torvalds, Ingo Molnar
|
|
*
|
|
* This file contains the lowest level x86_64-specific interrupt
|
|
* entry and irq statistics code. All the remaining irq logic is
|
|
* done by the generic kernel/irq/ code and in the
|
|
* x86_64-specific irq controller code. (e.g. i8259.c and
|
|
* io_apic.c.)
|
|
*/
|
|
|
|
#include <linux/kernel_stat.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/seq_file.h>
|
|
#include <linux/module.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/ftrace.h>
|
|
#include <linux/uaccess.h>
|
|
#include <linux/smp.h>
|
|
#include <asm/io_apic.h>
|
|
#include <asm/idle.h>
|
|
#include <asm/apic.h>
|
|
|
|
DEFINE_PER_CPU_SHARED_ALIGNED(irq_cpustat_t, irq_stat);
|
|
EXPORT_PER_CPU_SYMBOL(irq_stat);
|
|
|
|
DEFINE_PER_CPU(struct pt_regs *, irq_regs);
|
|
EXPORT_PER_CPU_SYMBOL(irq_regs);
|
|
|
|
/*
|
|
* Probabilistic stack overflow check:
|
|
*
|
|
* Only check the stack in process context, because everything else
|
|
* runs on the big interrupt stacks. Checking reliably is too expensive,
|
|
* so we just check from interrupts.
|
|
*/
|
|
static inline void stack_overflow_check(struct pt_regs *regs)
|
|
{
|
|
#ifdef CONFIG_DEBUG_STACKOVERFLOW
|
|
u64 curbase = (u64)task_stack_page(current);
|
|
|
|
WARN_ONCE(regs->sp >= curbase &&
|
|
regs->sp <= curbase + THREAD_SIZE &&
|
|
regs->sp < curbase + sizeof(struct thread_info) +
|
|
sizeof(struct pt_regs) + 128,
|
|
|
|
"do_IRQ: %s near stack overflow (cur:%Lx,sp:%lx)\n",
|
|
current->comm, curbase, regs->sp);
|
|
#endif
|
|
}
|
|
|
|
bool handle_irq(unsigned irq, struct pt_regs *regs)
|
|
{
|
|
struct irq_desc *desc;
|
|
|
|
stack_overflow_check(regs);
|
|
|
|
desc = irq_to_desc(irq);
|
|
if (unlikely(!desc))
|
|
return false;
|
|
|
|
generic_handle_irq_desc(irq, desc);
|
|
return true;
|
|
}
|
|
|
|
|
|
extern void call_softirq(void);
|
|
|
|
asmlinkage void do_softirq(void)
|
|
{
|
|
__u32 pending;
|
|
unsigned long flags;
|
|
|
|
if (in_interrupt())
|
|
return;
|
|
|
|
local_irq_save(flags);
|
|
pending = local_softirq_pending();
|
|
/* Switch to interrupt stack */
|
|
if (pending) {
|
|
call_softirq();
|
|
WARN_ON_ONCE(softirq_count());
|
|
}
|
|
local_irq_restore(flags);
|
|
}
|