linux-kernel - Re: [PATCH 12/23] i2c: lpc2k: Remove #ifdef guards for PM related functions

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Message-ID: <20230706103947.00000119@Huawei.com>
Date:   Thu, 6 Jul 2023 10:39:47 +0800
From:   Jonathan Cameron <Jonathan.Cameron@...wei.com>
To:     Paul Cercueil <paul@...pouillou.net>
CC:     Wolfram Sang <wsa@...nel.org>, <linux-i2c@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, Vladimir Zapolskiy <vz@...ia.com>,
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 12/23] i2c: lpc2k: Remove #ifdef guards for PM related
 functions

On Wed,  5 Jul 2023 22:43:03 +0200
Paul Cercueil <paul@...pouillou.net> wrote:

> Use the new PM macros for the suspend and resume functions to be
> automatically dropped by the compiler when CONFIG_PM or
> CONFIG_PM_SLEEP are disabled, without having to use #ifdef guards.
> 
> This has the advantage of always compiling these functions in,
> independently of any Kconfig option. Thanks to that, bugs and other
> regressions are subsequently easier to catch.
> 
> Note that the behaviour is slightly different than before; the original
> code wrapped the suspend/resume with #ifdef CONFIG_PM guards, which
> resulted in these functions being compiled in but never used when
> CONFIG_PM_SLEEP was disabled.
> 
> Now, those functions are only compiled in when CONFIG_PM_SLEEP is
> enabled.
> 
> Also note that pm_sleep_ptr() has not been applied to each callback
> in the dev_pm_ops structure because the pm_sleep_ptr() at the usage site
> is sufficient.
> 
> Signed-off-by: Paul Cercueil <paul@...pouillou.net>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>