linux-kernel - Re: [PATCH v1 07/25] lockdep: Add preemption disabled assertion API

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Message-ID: <20200523224132.GD2483@worktop.programming.kicks-ass.net>
Date:   Sun, 24 May 2020 00:41:32 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     "Sebastian A. Siewior" <bigeasy@...utronix.de>
Cc:     "Ahmed S. Darwish" <a.darwish@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Will Deacon <will@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1 07/25] lockdep: Add preemption disabled assertion API

On Sat, May 23, 2020 at 04:59:42PM +0200, Sebastian A. Siewior wrote:
> On 2020-05-22 19:55:03 [+0200], Peter Zijlstra wrote:

> > That is both more consistent with the things you claim it's modelled
> > after and also completely avoids that header dependency.
> 
> So we need additionally: 
> 
> - #include <linux/sched.h> in include/linux/flex_proportions.h
>   and I think un another file as well.
> 
> - write_seqcount_t_begin_nested() as a define
> 
> - write_seqcount_t_begin() as a define
> 
> Any "static inline" in the header file using
> lockdep_assert_preemption_disabled() will tro to complain about missing
> current-> define. But yes, it will work otherwise.

Because...? /me rummages around.. Ah you're proposing sticking this in
seqcount itself and then header hell.

Moo.. ok I'll go have another look on Monday.