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

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Date: Mon, 18 Dec 2023 20:46:17 -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 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.