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m68k/mac: Improve NMI handler

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mac_nmi_handler() is useless in its present form and locks up my PowerBook
180. Let's throw out the dead code and make it do something useful: print
a register dump and a stack trace.

mac_debug_handler() is also dead code. Remove it along with its static
data.

Signed-off-by: Finn Thain <fthain@telegraphics.com.au>
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
This commit is contained in:
Finn Thain 2017-01-02 04:53:54 -05:00 committed by Geert Uytterhoeven
parent c7ff87409d
commit 3cd53b14e7
1 changed files with 8 additions and 59 deletions
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67
arch/m68k/mac/macints.c
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@ -127,12 +127,9 @@
#define SHUTUP_SONIC
/*
* console_loglevel determines NMI handler function
*/
extern void show_registers(struct pt_regs *);
irqreturn_t mac_nmi_handler(int, void *);
irqreturn_t mac_debug_handler(int, void *);
/* #define DEBUG_MACINTS */
@ -276,65 +273,17 @@ static void mac_irq_shutdown(struct irq_data *data)
mac_irq_disable(data);
}
static int num_debug[8];
irqreturn_t mac_debug_handler(int irq, void *dev_id)
{
if (num_debug[irq] < 10) {
printk("DEBUG: Unexpected IRQ %d\n", irq);
num_debug[irq]++;
}
return IRQ_HANDLED;
}
static int in_nmi;
static volatile int nmi_hold;
static volatile int in_nmi;
irqreturn_t mac_nmi_handler(int irq, void *dev_id)
{
int i;
/*
* generate debug output on NMI switch if 'debug' kernel option given
* (only works with Penguin!)
*/
if (in_nmi)
return IRQ_HANDLED;
in_nmi = 1;
in_nmi++;
for (i=0; i<100; i++)
udelay(1000);
pr_info("Non-Maskable Interrupt\n");
show_registers(get_irq_regs());
if (in_nmi == 1) {
nmi_hold = 1;
printk("... pausing, press NMI to resume ...");
} else {
printk(" ok!\n");
nmi_hold = 0;
}
barrier();
while (nmi_hold == 1)
udelay(1000);
if (console_loglevel >= 8) {
#if 0
struct pt_regs *fp = get_irq_regs();
show_state();
printk("PC: %08lx\nSR: %04x SP: %p\n", fp->pc, fp->sr, fp);
printk("d0: %08lx d1: %08lx d2: %08lx d3: %08lx\n",
fp->d0, fp->d1, fp->d2, fp->d3);
printk("d4: %08lx d5: %08lx a0: %08lx a1: %08lx\n",
fp->d4, fp->d5, fp->a0, fp->a1);
if (STACK_MAGIC != *(unsigned long *)current->kernel_stack_page)
printk("Corrupted stack page\n");
printk("Process %s (pid: %d, stackpage=%08lx)\n",
current->comm, current->pid, current->kernel_stack_page);
if (intr_count == 1)
dump_stack((struct frame *)fp);
#else
/* printk("NMI "); */
#endif
}
in_nmi--;
in_nmi = 0;
return IRQ_HANDLED;
}