4.4-stable review patch. If anyone has any objections, please let me know.
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From: "Steven Rostedt (VMware)" rostedt@goodmis.org
[ Upstream commit fcc784be837714a9173b372ff9fb9b514590dad9 ]
While debugging where things were going wrong with mapping enabling/disabling interrupts with the lockdep state and actual real enabling and disabling interrupts, I had to silent the IRQ disabling/enabling in debug_check_no_locks_freed() because it was always showing up as it was called before the splat was.
Use raw_local_irq_save/restore() for not only debug_check_no_locks_freed() but for all internal lockdep functions, as they hide useful information about where interrupts were used incorrectly last.
Signed-off-by: Steven Rostedt (VMware) rostedt@goodmis.org Cc: Andrew Morton akpm@linux-foundation.org Cc: Linus Torvalds torvalds@linux-foundation.org Cc: Paul E. McKenney paulmck@linux.vnet.ibm.com Cc: Peter Zijlstra peterz@infradead.org Cc: Thomas Gleixner tglx@linutronix.de Cc: Will Deacon will.deacon@arm.com Link: https://lkml.kernel.org/lkml/20180404140630.3f4f4c7a@gandalf.local.home Signed-off-by: Ingo Molnar mingo@kernel.org Signed-off-by: Sasha Levin alexander.levin@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- kernel/locking/lockdep.c | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-)
--- a/kernel/locking/lockdep.c +++ b/kernel/locking/lockdep.c @@ -1264,11 +1264,11 @@ unsigned long lockdep_count_forward_deps this.parent = NULL; this.class = class;
- local_irq_save(flags); + raw_local_irq_save(flags); arch_spin_lock(&lockdep_lock); ret = __lockdep_count_forward_deps(&this); arch_spin_unlock(&lockdep_lock); - local_irq_restore(flags); + raw_local_irq_restore(flags);
return ret; } @@ -1291,11 +1291,11 @@ unsigned long lockdep_count_backward_dep this.parent = NULL; this.class = class;
- local_irq_save(flags); + raw_local_irq_save(flags); arch_spin_lock(&lockdep_lock); ret = __lockdep_count_backward_deps(&this); arch_spin_unlock(&lockdep_lock); - local_irq_restore(flags); + raw_local_irq_restore(flags);
return ret; } @@ -4123,7 +4123,7 @@ void debug_check_no_locks_freed(const vo if (unlikely(!debug_locks)) return;
- local_irq_save(flags); + raw_local_irq_save(flags); for (i = 0; i < curr->lockdep_depth; i++) { hlock = curr->held_locks + i;
@@ -4134,7 +4134,7 @@ void debug_check_no_locks_freed(const vo print_freed_lock_bug(curr, mem_from, mem_from + mem_len, hlock); break; } - local_irq_restore(flags); + raw_local_irq_restore(flags); } EXPORT_SYMBOL_GPL(debug_check_no_locks_freed);