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s390/test_unwind: use timer instead of udelay 

Instead of registering an external interrupt handler and relying on
the udelay implementation, simply use a timer to get into irq context.

Acked-by: Ilya Leoshkevich <iii@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
This commit is contained in:
Heiko Carstens 2020-12-09 22:09:16 +01:00
parent f22b9c219a
commit 91c2bad6ae
1 changed files with 10 additions and 14 deletions
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24
arch/s390/lib/test_unwind.c
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@ -9,12 +9,12 @@
#include <linux/kallsyms.h>
#include <linux/kthread.h>
#include <linux/module.h>
#include <linux/timer.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/kprobes.h>
#include <linux/wait.h>
#include <asm/irq.h>
#include <asm/delay.h>
#define BT_BUF_SIZE (PAGE_SIZE * 4)
@ -226,31 +226,27 @@ static noinline int unwindme_func1(void *u)
return unwindme_func2((struct unwindme *)u);
}
static void unwindme_irq_handler(struct ext_code ext_code,
unsigned int param32,
unsigned long param64)
static void unwindme_timer_fn(struct timer_list *unused)
{
struct unwindme *u = READ_ONCE(unwindme);
if (u && u->task == current) {
if (u) {
unwindme = NULL;
u->task = NULL;
u->ret = unwindme_func1(u);
complete(&u->task_ready);
}
}
static struct timer_list unwind_timer;
static int test_unwind_irq(struct unwindme *u)
{
preempt_disable();
if (register_external_irq(EXT_IRQ_CLK_COMP, unwindme_irq_handler)) {
pr_info("Couldn't register external interrupt handler");
return -1;
}
u->task = current;
unwindme = u;
udelay(1);
unregister_external_irq(EXT_IRQ_CLK_COMP, unwindme_irq_handler);
preempt_enable();
init_completion(&u->task_ready);
timer_setup(&unwind_timer, unwindme_timer_fn, 0);
mod_timer(&unwind_timer, jiffies + 1);
wait_for_completion(&u->task_ready);
return u->ret;
}