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s390/test_unwind: add "backtrace" module parameter 

By default no backtraces are printed when a test succeeds, but sometimes
it is useful to spot issues automated test doesn't cover. Add "backtrace"
module parameter to force it.

Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
This commit is contained in:
Vasily Gorbik 2022-02-01 21:04:16 +01:00
parent 93bd323244
commit 8a0c970550
1 changed files with 5 additions and 1 deletions
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6
arch/s390/lib/test_unwind.c
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@ -20,6 +20,10 @@ static struct kunit *current_test;
#define BT_BUF_SIZE (PAGE_SIZE * 4)
static bool force_bt;
module_param_named(backtrace, force_bt, bool, 0444);
MODULE_PARM_DESC(backtrace, "print backtraces for all tests");
/*
* To avoid printk line limit split backtrace by lines
*/
@ -98,7 +102,7 @@ static noinline int test_unwind(struct task_struct *task, struct pt_regs *regs,
kunit_err(current_test, "Maximum number of frames exceeded\n");
ret = -EINVAL;
}
if (ret)
if (ret || force_bt)
print_backtrace(bt);
kfree(bt);
return ret;