From: Heiko Carstens hca@linux.ibm.com
[ Upstream commit 3c4d0ae0671827f4b536cc2d26f8b9c54584ccc5 ]
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 Signed-off-by: Sasha Levin sashal@kernel.org --- arch/s390/kernel/early.c | 17 +++++++++++++++-- 1 file changed, 15 insertions(+), 2 deletions(-)
diff --git a/arch/s390/kernel/early.c b/arch/s390/kernel/early.c index 3a54733e4fc65..eb6307c066c8a 100644 --- a/arch/s390/kernel/early.c +++ b/arch/s390/kernel/early.c @@ -174,8 +174,21 @@ 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)