Heiko Carstens b1cae1f84a s390: fix irq state tracing ... With commit 58c644ba51 ("sched/idle: Fix arch_cpu_idle() vs tracing") common code calls arch_cpu_idle() with a lockdep state that tells irqs are on. This doesn't work very well for s390: psw_idle() will enable interrupts to wait for an interrupt. As soon as an interrupt occurs the interrupt handler will verify if the old context was psw_idle(). If that is the case the interrupt enablement bits in the old program status word will be cleared. A subsequent test in both the external as well as the io interrupt handler checks if in the old context interrupts were enabled. Due to the above patching of the old program status word it is assumed the old context had interrupts disabled, and therefore a call to TRACE_IRQS_OFF (aka trace_hardirqs_off_caller) is skipped. Which in turn makes lockdep incorrectly "think" that interrupts are enabled within the interrupt handler. Fix this by unconditionally calling TRACE_IRQS_OFF when entering interrupt handlers. Also call unconditionally TRACE_IRQS_ON when leaving interrupts handlers. This leaves the special psw_idle() case, which now returns with interrupts disabled, but has an "irqs on" lockdep state. So callers of psw_idle() must adjust the state on their own, if required. This is currently only __udelay_disabled(). Fixes: 58c644ba51 ("sched/idle: Fix arch_cpu_idle() vs tracing") Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Heiko Carstens <hca@linux.ibm.com>		2020-12-02 18:17:50 +01:00
..
Makefile	s390: enable HAVE_FUNCTION_ERROR_INJECTION	2020-07-27 10:33:28 +02:00
delay.c	s390: fix irq state tracing	2020-12-02 18:17:50 +01:00
error-inject.c	s390: enable HAVE_FUNCTION_ERROR_INJECTION	2020-07-27 10:33:28 +02:00
find.c	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
mem.S	s390: add missing ENDPROC statements to assembler functions	2019-05-02 13:54:11 +02:00
probes.c	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
spinlock.c	s390/spinlock: remove confusing comment in arch_spin_lock_wait	2019-12-11 19:53:23 +01:00
string.c	s390/lib: fix kernel doc for memcmp()	2020-10-07 21:50:01 +02:00
test_unwind.c	s390/test_unwind: fix possible memleak in test_unwind()	2020-08-11 18:16:16 +02:00
uaccess.c	s390/mm: fix page table upgrade vs 2ndary address mode accesses	2020-04-21 15:16:43 +02:00
xor.c	s390/lib: add missing include	2019-07-29 18:05:02 +02:00