linux-kernel - Re: [PATCH 1/2] thermal/drivers/core: Add init section table for self-encapsulation

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Date:   Mon, 24 Jun 2019 09:32:36 +0200
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     rui.zhang@...el.com
Cc:     linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
        amit.kucheria@...aro.org
Subject: Re: [PATCH 1/2] thermal/drivers/core: Add init section table for
 self-encapsulation


Any chance this patch gets merged for v5.4?

Thanks
  -- Daniel

On 12/06/2019 22:13, Daniel Lezcano wrote:
> Currently the governors are declared in their respective files but they
> export their [un]register functions which in turn call the [un]register
> governors core's functions. That implies a cyclic dependency which is
> not desirable. There is a way to self-encapsulate the governors by letting
> them to declare themselves in a __init section table.
> 
> Define the table in the asm generic linker description like the other
> tables and provide the specific macros to deal with.
> 
> Reviewed-by: Amit Kucheria <amit.kucheria@...aro.org>
> Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>
> ---
>  drivers/thermal/thermal_core.h    | 15 +++++++++++++++
>  include/asm-generic/vmlinux.lds.h | 11 +++++++++++
>  2 files changed, 26 insertions(+)
> 
> diff --git a/drivers/thermal/thermal_core.h b/drivers/thermal/thermal_core.h
> index 0df190ed82a7..be901e84aa65 100644
> --- a/drivers/thermal/thermal_core.h
> +++ b/drivers/thermal/thermal_core.h
> @@ -15,6 +15,21 @@
>  /* Initial state of a cooling device during binding */
>  #define THERMAL_NO_TARGET -1UL
>  
> +/* Init section thermal table */
> +extern struct thermal_governor *__governor_thermal_table[];
> +extern struct thermal_governor *__governor_thermal_table_end[];
> +
> +#define THERMAL_TABLE_ENTRY(table, name)			\
> +	(static typeof(name) *__thermal_table_entry_##name	\
> +	__used __section(__##table##_thermal_table) = &name)
> +
> +#define THERMAL_GOVERNOR_DECLARE(name)	THERMAL_TABLE_ENTRY(governor, name)
> +
> +#define for_each_governor_table(__governor)		\
> +	for (__governor = __governor_thermal_table;	\
> +	     __governor < __governor_thermal_table_end;	\
> +	     __governor++)
> +
>  /*
>   * This structure is used to describe the behavior of
>   * a certain cooling device on a certain trip point
> diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h
> index f8f6f04c4453..8312fdc2b2fa 100644
> --- a/include/asm-generic/vmlinux.lds.h
> +++ b/include/asm-generic/vmlinux.lds.h
> @@ -239,6 +239,16 @@
>  #define ACPI_PROBE_TABLE(name)
>  #endif
>  
> +#ifdef CONFIG_THERMAL
> +#define THERMAL_TABLE(name)						\
> +	. = ALIGN(8);							\
> +	__##name##_thermal_table = .;					\
> +	KEEP(*(__##name##_thermal_table))				\
> +	__##name##_thermal_table_end = .;
> +#else
> +#define THERMAL_TABLE(name)
> +#endif
> +
>  #define KERNEL_DTB()							\
>  	STRUCT_ALIGN();							\
>  	__dtb_start = .;						\
> @@ -609,6 +619,7 @@
>  	IRQCHIP_OF_MATCH_TABLE()					\
>  	ACPI_PROBE_TABLE(irqchip)					\
>  	ACPI_PROBE_TABLE(timer)						\
> +	THERMAL_TABLE(governor)						\
>  	EARLYCON_TABLE()						\
>  	LSM_TABLE()
>  
> 


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