commit 6a97f4118ac07cfdc316433f385dbdc12af5025e upstream.
die() can be called in exception handler, and therefore cannot sleep.
However, die() takes spinlock_t which can sleep with PREEMPT_RT enabled.
That causes the following warning:
BUG: sleeping function called from invalid context at kernel/locking/spinlock_rt.c:48
in_atomic(): 1, irqs_disabled(): 1, non_block: 0, pid: 285, name: mutex
preempt_count: 110001, expected: 0
RCU nest depth: 0, expected: 0
CPU: 0 UID: 0 PID: 285 Comm: mutex Not tainted 6.12.0-rc7-00022-ge19049cf7d56-dirty #234
Hardware name: riscv-virtio,qemu (DT)
Call Trace:
dump_backtrace+0x1c/0x24
show_stack+0x2c/0x38
dump_stack_lvl+0x5a/0x72
dump_stack+0x14/0x1c
__might_resched+0x130/0x13a
rt_spin_lock+0x2a/0x5c
die+0x24/0x112
do_trap_insn_illegal+0xa0/0xea
_new_vmalloc_restore_context_a0+0xcc/0xd8
Oops - illegal instruction [#1]
Switch to use raw_spinlock_t, which does not sleep even with PREEMPT_RT
enabled.
Fixes: 76d2a0493a ("RISC-V: Init and Halt Code")
Signed-off-by: Nam Cao <namcao@linutronix.de>
Cc: stable@vger.kernel.org
Reviewed-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Link: https://lore.kernel.org/r/20241118091333.1185288-1-namcao@linutronix.de
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
c21df31fc2