mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-17 01:04:19 +08:00
394e3902c5
When we stop allocating percpu memory for not-possible CPUs we must not touch the percpu data for not-possible CPUs at all. The correct way of doing this is to test cpu_possible() or to use for_each_cpu(). This patch is a kernel-wide sweep of all instances of NR_CPUS. I found very few instances of this bug, if any. But the patch converts lots of open-coded test to use the preferred helper macros. Cc: Mikael Starvik <starvik@axis.com> Cc: David Howells <dhowells@redhat.com> Acked-by: Kyle McMartin <kyle@parisc-linux.org> Cc: Anton Blanchard <anton@samba.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Paul Mundt <lethal@linux-sh.org> Cc: "David S. Miller" <davem@davemloft.net> Cc: William Lee Irwin III <wli@holomorphy.com> Cc: Andi Kleen <ak@muc.de> Cc: Christian Zankel <chris@zankel.net> Cc: Philippe Elie <phil.el@wanadoo.fr> Cc: Nathan Scott <nathans@sgi.com> Cc: Jens Axboe <axboe@suse.de> Cc: Eric Dumazet <dada1@cosmosbay.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
113 lines
2.6 KiB
C
113 lines
2.6 KiB
C
/*
|
|
*
|
|
* linux/arch/cris/kernel/irq.c
|
|
*
|
|
* Copyright (c) 2000,2001 Axis Communications AB
|
|
*
|
|
* Authors: Bjorn Wesen (bjornw@axis.com)
|
|
*
|
|
* This file contains the code used by various IRQ handling routines:
|
|
* asking for different IRQ's should be done through these routines
|
|
* instead of just grabbing them. Thus setups with different IRQ numbers
|
|
* shouldn't result in any weird surprises, and installing new handlers
|
|
* should be easier.
|
|
*
|
|
*/
|
|
|
|
/*
|
|
* IRQ's are in fact implemented a bit like signal handlers for the kernel.
|
|
* Naturally it's not a 1:1 relation, but there are similarities.
|
|
*/
|
|
|
|
#include <linux/config.h>
|
|
#include <linux/module.h>
|
|
#include <linux/ptrace.h>
|
|
#include <linux/irq.h>
|
|
|
|
#include <linux/kernel_stat.h>
|
|
#include <linux/signal.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/ioport.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/timex.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/random.h>
|
|
#include <linux/init.h>
|
|
#include <linux/seq_file.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/spinlock.h>
|
|
|
|
#include <asm/io.h>
|
|
|
|
void ack_bad_irq(unsigned int irq)
|
|
{
|
|
printk("unexpected IRQ trap at vector %02x\n", irq);
|
|
}
|
|
|
|
int show_interrupts(struct seq_file *p, void *v)
|
|
{
|
|
int i = *(loff_t *) v, j;
|
|
struct irqaction * action;
|
|
unsigned long flags;
|
|
|
|
if (i == 0) {
|
|
seq_printf(p, " ");
|
|
for_each_online_cpu(j)
|
|
seq_printf(p, "CPU%d ",j);
|
|
seq_putc(p, '\n');
|
|
}
|
|
|
|
if (i < NR_IRQS) {
|
|
spin_lock_irqsave(&irq_desc[i].lock, flags);
|
|
action = irq_desc[i].action;
|
|
if (!action)
|
|
goto skip;
|
|
seq_printf(p, "%3d: ",i);
|
|
#ifndef CONFIG_SMP
|
|
seq_printf(p, "%10u ", kstat_irqs(i));
|
|
#else
|
|
for_each_online_cpu(j)
|
|
seq_printf(p, "%10u ", kstat_cpu(j).irqs[i]);
|
|
#endif
|
|
seq_printf(p, " %14s", irq_desc[i].handler->typename);
|
|
seq_printf(p, " %s", action->name);
|
|
|
|
for (action=action->next; action; action = action->next)
|
|
seq_printf(p, ", %s", action->name);
|
|
|
|
seq_putc(p, '\n');
|
|
skip:
|
|
spin_unlock_irqrestore(&irq_desc[i].lock, flags);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
/* called by the assembler IRQ entry functions defined in irq.h
|
|
* to dispatch the interrupts to registred handlers
|
|
* interrupts are disabled upon entry - depending on if the
|
|
* interrupt was registred with SA_INTERRUPT or not, interrupts
|
|
* are re-enabled or not.
|
|
*/
|
|
|
|
asmlinkage void do_IRQ(int irq, struct pt_regs * regs)
|
|
{
|
|
unsigned long sp;
|
|
irq_enter();
|
|
sp = rdsp();
|
|
if (unlikely((sp & (PAGE_SIZE - 1)) < (PAGE_SIZE/8))) {
|
|
printk("do_IRQ: stack overflow: %lX\n", sp);
|
|
show_stack(NULL, (unsigned long *)sp);
|
|
}
|
|
__do_IRQ(irq, regs);
|
|
irq_exit();
|
|
}
|
|
|
|
void weird_irq(void)
|
|
{
|
|
local_irq_disable();
|
|
printk("weird irq\n");
|
|
while(1);
|
|
}
|
|
|