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Date: Tue, 15 Mar 2022 11:00:04 -0400
From: Waiman Long <longman@...hat.com>
To: Nick Desaulniers <ndesaulniers@...gle.com>,
Ingo Molnar <mingo@...hat.com>,
Boqun Feng <boqun.feng@...il.com>
Cc: Catalin Marinas <catalin.marinas@....com>,
Will Deacon <will@...nel.org>,
Paolo Bonzini <pbonzini@...hat.com>,
Thomas Gleixner <tglx@...utronix.de>,
Peter Zijlstra <peterz@...radead.org>,
Andy Lutomirski <luto@...nel.org>,
Juri Lelli <juri.lelli@...hat.com>,
Vincent Guittot <vincent.guittot@...aro.org>,
Dietmar Eggemann <dietmar.eggemann@....com>,
Steven Rostedt <rostedt@...dmis.org>,
Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>,
Daniel Bristot de Oliveira <bristot@...hat.com>,
Mark Rutland <mark.rutland@....com>,
Joey Gouly <joey.gouly@....com>, Marc Zyngier <maz@...nel.org>,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
kvm@...r.kernel.org
Subject: Re: [PATCH] lockdep: fix -Wunused-parameter for _THIS_IP_
On 3/14/22 18:19, Nick Desaulniers wrote:
> While looking into a bug related to the compiler's handling of addresses
> of labels, I noticed some uses of _THIS_IP_ seemed unused in lockdep.
> Drive by cleanup.
>
> -Wunused-parameter:
> kernel/locking/lockdep.c:1383:22: warning: unused parameter 'ip'
> kernel/locking/lockdep.c:4246:48: warning: unused parameter 'ip'
> kernel/locking/lockdep.c:4844:19: warning: unused parameter 'ip'
>
> Signed-off-by: Nick Desaulniers <ndesaulniers@...gle.com>
> ---
> arch/arm64/kernel/entry-common.c | 8 ++++----
> include/linux/irqflags.h | 4 ++--
> include/linux/kvm_host.h | 2 +-
> kernel/entry/common.c | 6 +++---
> kernel/locking/lockdep.c | 22 ++++++++--------------
> kernel/sched/idle.c | 2 +-
> kernel/trace/trace_preemptirq.c | 4 ++--
> 7 files changed, 21 insertions(+), 27 deletions(-)
>
> diff --git a/arch/arm64/kernel/entry-common.c b/arch/arm64/kernel/entry-common.c
> index ef7fcefb96bd..8a4244316e25 100644
> --- a/arch/arm64/kernel/entry-common.c
> +++ b/arch/arm64/kernel/entry-common.c
> @@ -73,7 +73,7 @@ static __always_inline void __exit_to_kernel_mode(struct pt_regs *regs)
> if (interrupts_enabled(regs)) {
> if (regs->exit_rcu) {
> trace_hardirqs_on_prepare();
> - lockdep_hardirqs_on_prepare(CALLER_ADDR0);
> + lockdep_hardirqs_on_prepare();
> rcu_irq_exit();
> lockdep_hardirqs_on(CALLER_ADDR0);
> return;
> @@ -118,7 +118,7 @@ static __always_inline void enter_from_user_mode(struct pt_regs *regs)
> static __always_inline void __exit_to_user_mode(void)
> {
> trace_hardirqs_on_prepare();
> - lockdep_hardirqs_on_prepare(CALLER_ADDR0);
> + lockdep_hardirqs_on_prepare();
> user_enter_irqoff();
> lockdep_hardirqs_on(CALLER_ADDR0);
> }
> @@ -176,7 +176,7 @@ static void noinstr arm64_exit_nmi(struct pt_regs *regs)
> ftrace_nmi_exit();
> if (restore) {
> trace_hardirqs_on_prepare();
> - lockdep_hardirqs_on_prepare(CALLER_ADDR0);
> + lockdep_hardirqs_on_prepare();
> }
>
> rcu_nmi_exit();
> @@ -212,7 +212,7 @@ static void noinstr arm64_exit_el1_dbg(struct pt_regs *regs)
>
> if (restore) {
> trace_hardirqs_on_prepare();
> - lockdep_hardirqs_on_prepare(CALLER_ADDR0);
> + lockdep_hardirqs_on_prepare();
> }
>
> rcu_nmi_exit();
> diff --git a/include/linux/irqflags.h b/include/linux/irqflags.h
> index 4b140938b03e..5ec0fa71399e 100644
> --- a/include/linux/irqflags.h
> +++ b/include/linux/irqflags.h
> @@ -20,13 +20,13 @@
> #ifdef CONFIG_PROVE_LOCKING
> extern void lockdep_softirqs_on(unsigned long ip);
> extern void lockdep_softirqs_off(unsigned long ip);
> - extern void lockdep_hardirqs_on_prepare(unsigned long ip);
> + extern void lockdep_hardirqs_on_prepare(void);
> extern void lockdep_hardirqs_on(unsigned long ip);
> extern void lockdep_hardirqs_off(unsigned long ip);
> #else
> static inline void lockdep_softirqs_on(unsigned long ip) { }
> static inline void lockdep_softirqs_off(unsigned long ip) { }
> - static inline void lockdep_hardirqs_on_prepare(unsigned long ip) { }
> + static inline void lockdep_hardirqs_on_prepare(void) { }
> static inline void lockdep_hardirqs_on(unsigned long ip) { }
> static inline void lockdep_hardirqs_off(unsigned long ip) { }
> #endif
> diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
> index f11039944c08..f32bed70a5c5 100644
> --- a/include/linux/kvm_host.h
> +++ b/include/linux/kvm_host.h
> @@ -441,7 +441,7 @@ static __always_inline void guest_state_enter_irqoff(void)
> {
> instrumentation_begin();
> trace_hardirqs_on_prepare();
> - lockdep_hardirqs_on_prepare(CALLER_ADDR0);
> + lockdep_hardirqs_on_prepare();
> instrumentation_end();
>
> guest_context_enter_irqoff();
> diff --git a/kernel/entry/common.c b/kernel/entry/common.c
> index bad713684c2e..3ce3a0a6c762 100644
> --- a/kernel/entry/common.c
> +++ b/kernel/entry/common.c
> @@ -124,7 +124,7 @@ static __always_inline void __exit_to_user_mode(void)
> {
> instrumentation_begin();
> trace_hardirqs_on_prepare();
> - lockdep_hardirqs_on_prepare(CALLER_ADDR0);
> + lockdep_hardirqs_on_prepare();
> instrumentation_end();
>
> user_enter_irqoff();
> @@ -412,7 +412,7 @@ noinstr void irqentry_exit(struct pt_regs *regs, irqentry_state_t state)
> instrumentation_begin();
> /* Tell the tracer that IRET will enable interrupts */
> trace_hardirqs_on_prepare();
> - lockdep_hardirqs_on_prepare(CALLER_ADDR0);
> + lockdep_hardirqs_on_prepare();
> instrumentation_end();
> rcu_irq_exit();
> lockdep_hardirqs_on(CALLER_ADDR0);
> @@ -465,7 +465,7 @@ void noinstr irqentry_nmi_exit(struct pt_regs *regs, irqentry_state_t irq_state)
> ftrace_nmi_exit();
> if (irq_state.lockdep) {
> trace_hardirqs_on_prepare();
> - lockdep_hardirqs_on_prepare(CALLER_ADDR0);
> + lockdep_hardirqs_on_prepare();
> }
> instrumentation_end();
>
> diff --git a/kernel/locking/lockdep.c b/kernel/locking/lockdep.c
> index f8a0212189ca..05604795b39c 100644
> --- a/kernel/locking/lockdep.c
> +++ b/kernel/locking/lockdep.c
> @@ -1378,7 +1378,7 @@ static struct lock_list *alloc_list_entry(void)
> */
> static int add_lock_to_list(struct lock_class *this,
> struct lock_class *links_to, struct list_head *head,
> - unsigned long ip, u16 distance, u8 dep,
> + u16 distance, u8 dep,
> const struct lock_trace *trace)
> {
> struct lock_list *entry;
> @@ -3131,19 +3131,15 @@ check_prev_add(struct task_struct *curr, struct held_lock *prev,
> * to the previous lock's dependency list:
> */
> ret = add_lock_to_list(hlock_class(next), hlock_class(prev),
> - &hlock_class(prev)->locks_after,
> - next->acquire_ip, distance,
> - calc_dep(prev, next),
> - *trace);
> + &hlock_class(prev)->locks_after, distance,
> + calc_dep(prev, next), *trace);
>
> if (!ret)
> return 0;
>
> ret = add_lock_to_list(hlock_class(prev), hlock_class(next),
> - &hlock_class(next)->locks_before,
> - next->acquire_ip, distance,
> - calc_depb(prev, next),
> - *trace);
> + &hlock_class(next)->locks_before, distance,
> + calc_depb(prev, next), *trace);
> if (!ret)
> return 0;
>
> @@ -4234,14 +4230,13 @@ static void __trace_hardirqs_on_caller(void)
>
> /**
> * lockdep_hardirqs_on_prepare - Prepare for enabling interrupts
> - * @ip: Caller address
> *
> * Invoked before a possible transition to RCU idle from exit to user or
> * guest mode. This ensures that all RCU operations are done before RCU
> * stops watching. After the RCU transition lockdep_hardirqs_on() has to be
> * invoked to set the final state.
> */
> -void lockdep_hardirqs_on_prepare(unsigned long ip)
> +void lockdep_hardirqs_on_prepare(void)
> {
> if (unlikely(!debug_locks))
> return;
> @@ -4838,8 +4833,7 @@ EXPORT_SYMBOL_GPL(__lockdep_no_validate__);
>
> static void
> print_lock_nested_lock_not_held(struct task_struct *curr,
> - struct held_lock *hlock,
> - unsigned long ip)
> + struct held_lock *hlock)
> {
> if (!debug_locks_off())
> return;
> @@ -5015,7 +5009,7 @@ static int __lock_acquire(struct lockdep_map *lock, unsigned int subclass,
> chain_key = iterate_chain_key(chain_key, hlock_id(hlock));
>
> if (nest_lock && !__lock_is_held(nest_lock, -1)) {
> - print_lock_nested_lock_not_held(curr, hlock, ip);
> + print_lock_nested_lock_not_held(curr, hlock);
> return 0;
> }
>
> diff --git a/kernel/sched/idle.c b/kernel/sched/idle.c
> index d17b0a5ce6ac..499a3e286cd0 100644
> --- a/kernel/sched/idle.c
> +++ b/kernel/sched/idle.c
> @@ -105,7 +105,7 @@ void __cpuidle default_idle_call(void)
> * last -- this is very similar to the entry code.
> */
> trace_hardirqs_on_prepare();
> - lockdep_hardirqs_on_prepare(_THIS_IP_);
> + lockdep_hardirqs_on_prepare();
> rcu_idle_enter();
> lockdep_hardirqs_on(_THIS_IP_);
>
> diff --git a/kernel/trace/trace_preemptirq.c b/kernel/trace/trace_preemptirq.c
> index f4938040c228..95b58bd757ce 100644
> --- a/kernel/trace/trace_preemptirq.c
> +++ b/kernel/trace/trace_preemptirq.c
> @@ -46,7 +46,7 @@ void trace_hardirqs_on(void)
> this_cpu_write(tracing_irq_cpu, 0);
> }
>
> - lockdep_hardirqs_on_prepare(CALLER_ADDR0);
> + lockdep_hardirqs_on_prepare();
> lockdep_hardirqs_on(CALLER_ADDR0);
> }
> EXPORT_SYMBOL(trace_hardirqs_on);
> @@ -94,7 +94,7 @@ __visible void trace_hardirqs_on_caller(unsigned long caller_addr)
> this_cpu_write(tracing_irq_cpu, 0);
> }
>
> - lockdep_hardirqs_on_prepare(CALLER_ADDR0);
> + lockdep_hardirqs_on_prepare();
> lockdep_hardirqs_on(CALLER_ADDR0);
> }
> EXPORT_SYMBOL(trace_hardirqs_on_caller);
LGTM
Acked-by: Waiman Long <longman@...hat.com>
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