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Message-ID: <790fac97ce79534733fe0bbd93cc0c9eaa835bf2.camel@crapouillou.net>
Date: Wed, 20 Sep 2023 10:53:23 +0200
From: Paul Cercueil <paul@...pouillou.net>
To: Raag Jadav <raag.jadav@...el.com>, rafael@...nel.org,
len.brown@...el.com, pavel@....cz, Jonathan.Cameron@...wei.com,
andriy.shevchenko@...ux.intel.com, rf@...nsource.cirrus.com
Cc: linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
mallikarjunappa.sangannavar@...el.com, bala.senthil@...el.com
Subject: Re: [PATCH v3] PM: Fix symbol export for _SIMPLE_ variants of
_PM_OPS()
Hi,
Le mercredi 20 septembre 2023 à 14:11 +0530, Raag Jadav a écrit :
> Currently EXPORT_*_SIMPLE_DEV_PM_OPS() use EXPORT_*_DEV_PM_OPS() set
> of macros to export dev_pm_ops symbol, which export the symbol in
> case
> CONFIG_PM=y but don't take CONFIG_PM_SLEEP into consideration.
>
> Since _SIMPLE_ variants of _PM_OPS() do not include runtime PM
> handles
> and are only used in case CONFIG_PM_SLEEP=y, we should not be
> exporting
> their dev_pm_ops symbol in case CONFIG_PM_SLEEP=n.
>
> This can be fixed by having two distinct set of export macros for
> both
> _RUNTIME_ and _SIMPLE_ variants of _PM_OPS(), such that the export of
> dev_pm_ops symbol used in each variant depends on CONFIG_PM and
> CONFIG_PM_SLEEP respectively.
>
> Introduce _DEV_SLEEP_PM_OPS() set of export macros for _SIMPLE_
> variants
> of _PM_OPS(), which export dev_pm_ops symbol only in case
> CONFIG_PM_SLEEP=y
> and discard it otherwise.
>
> Fixes: 34e1ed189fab ("PM: Improve EXPORT_*_DEV_PM_OPS macros")
> Signed-off-by: Raag Jadav <raag.jadav@...el.com>
> ---
> PS: This is a standalone fix and works without updating any drivers.
I had to double-check that, to make sure that none of the drivers using
these macros also use pm_ptr() instead of pm_sleep_ptr() to access the
exported dev_pm_ops.
I did not check extensively but everything seems to use pm_sleep_ptr(),
so it looks safe enough.
>
> Changes since v2:
> - Drop redundant patches
>
> Changes since v1:
> - Update drivers to new set of macros
>
> include/linux/pm.h | 43 +++++++++++++++++++++++++++++--------------
> 1 file changed, 29 insertions(+), 14 deletions(-)
>
> diff --git a/include/linux/pm.h b/include/linux/pm.h
> index 1400c37b29c7..99a8146fa479 100644
> --- a/include/linux/pm.h
> +++ b/include/linux/pm.h
> @@ -374,24 +374,39 @@ const struct dev_pm_ops name = { \
> RUNTIME_PM_OPS(runtime_suspend_fn, runtime_resume_fn,
> idle_fn) \
> }
>
> -#ifdef CONFIG_PM
> -#define _EXPORT_DEV_PM_OPS(name, license,
> ns) \
> +#define _EXPORT_PM_OPS(name, license,
> ns) \
> const struct dev_pm_ops
> name; \
> __EXPORT_SYMBOL(name, license,
> ns); \
> const struct dev_pm_ops name
> -#define EXPORT_PM_FN_GPL(name) EXPORT_SYMBOL_GPL(name)
> -#define EXPORT_PM_FN_NS_GPL(name, ns) EXPORT_SYMBOL_NS_GPL(name,
> ns)
> -#else
> -#define _EXPORT_DEV_PM_OPS(name, license,
> ns) \
> +
> +#define _PM_OPS(name, license,
This macro creates a dev_pm_ops that's meant to be garbage-collected by
the compiler; so maybe name it _USELESS_PM_OPS() or something like
that.
(I could have said that in your v2 patch, sorry)
Cheers,
-Paul
> ns) \
> static __maybe_unused const struct dev_pm_ops __static_##name
> +
> +#ifdef CONFIG_PM
> +#define _EXPORT_DEV_PM_OPS(name, license,
> ns) _EXPORT_PM_OPS(name, license, ns)
> +#define
> EXPORT_PM_FN_GPL(name) EXPORT_SYMBOL_GPL(name
> )
> +#define EXPORT_PM_FN_NS_GPL(name,
> ns) EXPORT_SYMBOL_NS_GPL(name, ns)
> +#else
> +#define _EXPORT_DEV_PM_OPS(name, license, ns) _PM_OPS(name,
> license, ns)
> #define EXPORT_PM_FN_GPL(name)
> #define EXPORT_PM_FN_NS_GPL(name, ns)
> #endif
>
> -#define EXPORT_DEV_PM_OPS(name) _EXPORT_DEV_PM_OPS(name, "", "")
> -#define EXPORT_GPL_DEV_PM_OPS(name) _EXPORT_DEV_PM_OPS(name, "GPL",
> "")
> -#define EXPORT_NS_DEV_PM_OPS(name, ns) _EXPORT_DEV_PM_OPS(name, "",
> #ns)
> -#define EXPORT_NS_GPL_DEV_PM_OPS(name, ns) _EXPORT_DEV_PM_OPS(name,
> "GPL", #ns)
> +#ifdef CONFIG_PM_SLEEP
> +#define _EXPORT_DEV_SLEEP_PM_OPS(name, license,
> ns) _EXPORT_PM_OPS(name, license, ns)
> +#else
> +#define _EXPORT_DEV_SLEEP_PM_OPS(name, license, ns) _PM_OPS(name,
> license, ns)
> +#endif
> +
> +#define
> EXPORT_DEV_PM_OPS(name) _EXPORT_DEV_PM
> _OPS(name, "", "")
> +#define
> EXPORT_GPL_DEV_PM_OPS(name) _EXPORT_DEV_PM_OPS(nam
> e, "GPL", "")
> +#define EXPORT_NS_DEV_PM_OPS(name,
> ns) _EXPORT_DEV_PM_OPS(name, "", #ns)
> +#define EXPORT_NS_GPL_DEV_PM_OPS(name,
> ns) _EXPORT_DEV_PM_OPS(name, "GPL", #ns)
> +
> +#define
> EXPORT_DEV_SLEEP_PM_OPS(name) _EXPORT_DEV_SLEEP_PM_O
> PS(name, "", "")
> +#define
> EXPORT_GPL_DEV_SLEEP_PM_OPS(name) _EXPORT_DEV_SLEEP_PM_O
> PS(name, "GPL", "")
> +#define EXPORT_NS_DEV_SLEEP_PM_OPS(name,
> ns) _EXPORT_DEV_SLEEP_PM_OPS(name, "", #ns)
> +#define EXPORT_NS_GPL_DEV_SLEEP_PM_OPS(name,
> ns) _EXPORT_DEV_SLEEP_PM_OPS(name, "GPL", #ns)
>
> /*
> * Use this if you want to use the same suspend and resume callbacks
> for suspend
> @@ -404,19 +419,19 @@ const struct dev_pm_ops name = { \
> _DEFINE_DEV_PM_OPS(name, suspend_fn, resume_fn, NULL, NULL,
> NULL)
>
> #define EXPORT_SIMPLE_DEV_PM_OPS(name, suspend_fn, resume_fn) \
> - EXPORT_DEV_PM_OPS(name) = { \
> + EXPORT_DEV_SLEEP_PM_OPS(name) = { \
> SYSTEM_SLEEP_PM_OPS(suspend_fn, resume_fn) \
> }
> #define EXPORT_GPL_SIMPLE_DEV_PM_OPS(name, suspend_fn, resume_fn) \
> - EXPORT_GPL_DEV_PM_OPS(name) = { \
> + EXPORT_GPL_DEV_SLEEP_PM_OPS(name) = { \
> SYSTEM_SLEEP_PM_OPS(suspend_fn, resume_fn) \
> }
> #define EXPORT_NS_SIMPLE_DEV_PM_OPS(name, suspend_fn, resume_fn,
> ns) \
> - EXPORT_NS_DEV_PM_OPS(name, ns) = { \
> + EXPORT_NS_DEV_SLEEP_PM_OPS(name, ns) = { \
> SYSTEM_SLEEP_PM_OPS(suspend_fn, resume_fn) \
> }
> #define EXPORT_NS_GPL_SIMPLE_DEV_PM_OPS(name, suspend_fn, resume_fn,
> ns) \
> - EXPORT_NS_GPL_DEV_PM_OPS(name, ns) = { \
> + EXPORT_NS_GPL_DEV_SLEEP_PM_OPS(name, ns) = { \
> SYSTEM_SLEEP_PM_OPS(suspend_fn, resume_fn) \
> }
>
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