linux-kernel - Re: [PATCH v4 04/13] locking/spinlock: introduce spin_lock_init_with

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Date:   Wed, 12 Apr 2023 12:14:44 -0700
From:   Boqun Feng <boqun.feng@...il.com>
To:     Wedson Almeida Filho <wedsonaf@...il.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Miguel Ojeda <ojeda@...nel.org>,
        Alex Gaynor <alex.gaynor@...il.com>,
        Gary Guo <gary@...yguo.net>,
        Björn Roy Baron <bjorn3_gh@...tonmail.com>,
        linux-kernel@...r.kernel.org,
        Wedson Almeida Filho <walmeida@...rosoft.com>,
        Ingo Molnar <mingo@...hat.com>, Will Deacon <will@...nel.org>,
        Waiman Long <longman@...hat.com>,
        Martin Rodriguez Reboredo <yakoyoku@...il.com>,
        rust-for-linux@...r.kernel.org
Subject: Re: [PATCH v4 04/13] locking/spinlock: introduce
 spin_lock_init_with_key

On Tue, Apr 11, 2023 at 03:05:07PM -0300, Wedson Almeida Filho wrote:
> On Tue, 11 Apr 2023 at 02:46, Wedson Almeida Filho <wedsonaf@...il.com> wrote:
> >
> > From: Wedson Almeida Filho <walmeida@...rosoft.com>
> >
> > Rust cannot call C macros, so it has its own macro to create a new lock
> > class when a spin lock is initialised. This new function allows Rust
> > code to pass the lock class it generates to the C implementation.
> >
> > Cc: Peter Zijlstra <peterz@...radead.org>
> > Cc: Ingo Molnar <mingo@...hat.com>
> > Cc: Will Deacon <will@...nel.org>
> > Cc: Waiman Long <longman@...hat.com>
> > Reviewed-by: Martin Rodriguez Reboredo <yakoyoku@...il.com>
> > Signed-off-by: Wedson Almeida Filho <walmeida@...rosoft.com>

Reviewed-by: Boqun Feng <boqun.feng@...il.com>

> > ---
> > v1 -> v2: No changes
> > v2 -> v3: No changes
> > v3 -> v4: No changes
> >
> >  include/linux/spinlock.h | 9 +++++++--
> >  1 file changed, 7 insertions(+), 2 deletions(-)
> >
> > diff --git a/include/linux/spinlock.h b/include/linux/spinlock.h
> > index be48f1cb1878..cdc92d095133 100644
> > --- a/include/linux/spinlock.h
> > +++ b/include/linux/spinlock.h
> > @@ -327,12 +327,17 @@ static __always_inline raw_spinlock_t *spinlock_check(spinlock_t *lock)
> >
> >  #ifdef CONFIG_DEBUG_SPINLOCK
> >
> > +static inline void spin_lock_init_with_key(spinlock_t *lock, const char *name,
> > +                                          struct lock_class_key *key)
> > +{
> > +       __raw_spin_lock_init(spinlock_check(lock), name, key, LD_WAIT_CONFIG);
> > +}
> > +
> >  # define spin_lock_init(lock)                                  \
> >  do {                                                           \
> >         static struct lock_class_key __key;                     \
> >                                                                 \
> > -       __raw_spin_lock_init(spinlock_check(lock),              \
> > -                            #lock, &__key, LD_WAIT_CONFIG);    \
> > +       spin_lock_init_with_key(lock, #lock, &__key);           \
> >  } while (0)
> 
> Peter, the code above is just factoring out spin lock init when
> lockdep is enabled to take a lock class key.
> 
> Would you be able to review it?
> 
> If it's ok with you, we'd like to carry it through the rust tree
> because we have code that depends on it.

Same ask here ;-) Peter, do you think it's Ok to take it via rust tree?
Thanks!

Regards,
Boqun

> 
> Thanks,
> -Wedson
> 
> >
> >  #else
> > --
> > 2.34.1
> >