linux-kernel - Re: [PATCH v2 03/13] rust: lock: introduce `Mutex`

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Message-ID: <20230405191826.GA365912@hirez.programming.kicks-ass.net>
Date:   Wed, 5 Apr 2023 21:18:26 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     Wedson Almeida Filho <wedsonaf@...il.com>,
        rust-for-linux@...r.kernel.org, Miguel Ojeda <ojeda@...nel.org>,
        Alex Gaynor <alex.gaynor@...il.com>,
        Boqun Feng <boqun.feng@...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>
Subject: Re: [PATCH v2 03/13] rust: lock: introduce `Mutex`

On Wed, Apr 05, 2023 at 08:04:22PM +0200, Greg KH wrote:
> On Wed, Apr 05, 2023 at 08:03:11PM +0200, Greg KH wrote:
> > On Wed, Apr 05, 2023 at 02:51:01PM -0300, Wedson Almeida Filho wrote:
> > > +void rust_helper_mutex_lock(struct mutex *lock)
> > > +{
> > > +	mutex_lock(lock);
> > > +}
> > > +EXPORT_SYMBOL_GPL(rust_helper_mutex_lock);
> > > +
> > 
> > No need to ever unlock a mutex?
> 
> Oh nevermind, mutex_lock() is a macro, mutex_unlock() is not...

Yeah, so I despise all these stupid helpers... but I suppose it's the
best they could come up with to interface the languages :/

The only hope is that the thing can do cross-language LTO or something
to re-inline stuff.