linux-kernel - Re: [PATCH 06/14] Input: samsung-keypad - use guard notation to acquire mutex

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Message-ID: <ZshJMRCe4LvpYNmZ@google.com>
Date: Fri, 23 Aug 2024 01:32:49 -0700
From: Dmitry Torokhov <dmitry.torokhov@...il.com>
To: Krzysztof Kozlowski <krzk@...nel.org>
Cc: Arnd Bergmann <arnd@...db.de>, Mark Brown <broonie@...nel.org>,
	linux-input@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-samsung-soc@...r.kernel.org, patches@...nsource.cirrus.com
Subject: Re: [PATCH 06/14] Input: samsung-keypad - use guard notation to
 acquire mutex

On Fri, Aug 23, 2024 at 08:06:17AM +0200, Krzysztof Kozlowski wrote:
> On 22/08/2024 20:07, Dmitry Torokhov wrote:
> > On Thu, Aug 22, 2024 at 05:48:33PM +0200, Krzysztof Kozlowski wrote:
> >> On Sun, Aug 18, 2024 at 09:58:03PM -0700, Dmitry Torokhov wrote:
> >>> Guard notation is more compact and ensures that the mutex will be
> >>> released when control leaves the function.
> >>>
> >>> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@...il.com>
> >>> ---
> >>>  drivers/input/keyboard/samsung-keypad.c | 8 ++------
> >>>  1 file changed, 2 insertions(+), 6 deletions(-)
> >>>
> >>
> >> You need to include cleanup.h (unless some other patch already did it
> >> and I missed it?)
> > 
> > Guard for mutexes defined in mutex.h which is pulled in indirectly, and
> 
> guard() is not in mutex.h and in general we are including headers for
> the things directly used in the unit.

Oh, but it is:

https://elixir.bootlin.com/linux/v6.10/source/include/linux/mutex.h#L196

DEFINE_GUARD(mutex, struct mutex *, mutex_lock(_T), mutex_unlock(_T))

> 
> > cleanup.h is included there.
> > 
> > If we want to list all the headers that we need instead of relying on
> 
> Fixing existing code is another thing. I only propose to add new code
> with the header.
> 
> I don't have strong opinion anyway, so:
> 
> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>

Thanks!

-- 
Dmitry