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s390/traps: Handle early warnings gracefully

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Add missing warning handling to the early program check handler. This
way a warning is printed to the console as soon as the early console
is setup, and the kernel continues to boot.

Before this change a disabled wait psw was loaded instead and the
machine was silently stopped without giving an idea about what
happened.

Reviewed-by: Sven Schnelle <svens@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
This commit is contained in:
Heiko Carstens
2024-07-31 15:26:01 +02:00
committed by Vasily Gorbik
parent f101b305a7
commit 3c4d0ae067
1 changed files with 15 additions and 2 deletions
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17
arch/s390/kernel/early.c
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@@ -177,8 +177,21 @@ static __init void setup_topology(void)
void __do_early_pgm_check(struct pt_regs *regs)
{
if (!fixup_exception(regs))
disabled_wait();
struct lowcore *lc = get_lowcore();
unsigned long ip;
regs->int_code = lc->pgm_int_code;
regs->int_parm_long = lc->trans_exc_code;
ip = __rewind_psw(regs->psw, regs->int_code >> 16);
/* Monitor Event? Might be a warning */
if ((regs->int_code & PGM_INT_CODE_MASK) == 0x40) {
if (report_bug(ip, regs) == BUG_TRAP_TYPE_WARN)
return;
}
if (fixup_exception(regs))
return;
disabled_wait();
}
static noinline __init void setup_lowcore_early(void)