linux-kernel - Re: [PATCH 19/50] locking/mutex: split out mutex

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Date: Mon, 18 Dec 2023 22:37:00 -0500
From: Kent Overstreet <kent.overstreet@...ux.dev>
To: Waiman Long <longman@...hat.com>
Cc: linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	linux-fsdevel@...r.kernel.org, tglx@...utronix.de, x86@...nel.org,
	tj@...nel.org, peterz@...radead.org, mathieu.desnoyers@...icios.com,
	paulmck@...nel.org, keescook@...omium.org,
	dave.hansen@...ux.intel.com, mingo@...hat.com, will@...nel.org,
	boqun.feng@...il.com, brauner@...nel.org
Subject: Re: [PATCH 19/50] locking/mutex: split out mutex_types.h

On Mon, Dec 18, 2023 at 10:04:39PM -0500, Waiman Long wrote:
> 
> On 12/18/23 20:46, Kent Overstreet wrote:
> > On Mon, Dec 18, 2023 at 11:53:08AM -0500, Waiman Long wrote:
> > > On 12/15/23 22:26, Kent Overstreet wrote:
> > > > -#include <linux/rtmutex.h>
> > > Including rtmutex.h here means that mutex_types.h is no longer a simple
> > > header for types only. So unless you also break out a rtmutex_types.h, it is
> > > inconsistent.
> > good observation, I'll have to leave it for the next round of cleanups
> > though since the merge window is approaching and I'll have to redo all
> > the testing.
> > 
> > > Besides, the kernel/sched code does use mutex_lock/unlock calls quite
> > > frequently. With this patch, mutex.h will not be directly included. I
> > > suspect that it is indirectly included via other header files. This may be
> > > an issue with some configurations.
> > I've now put it through randconfig testing on every arch that debian
> > includes a compiler for (excluding sh and xtensa, which throw internal
> > compiler errors) and that one hasn't come up yet.
> > 
> > could still be included indirectly though - I haven't checked for that
> > one specifically yet.
> 
> If you are replacing mutex.h in include/linux/sched.h by mutex_types.h, I
> would suggest you add mutex.h to kernel/sched/sched.h to ensure this header
> file is included by the scheduler code.

It already does, via mutex_api.h...