diff mbox series

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

Message ID 20190612201325.1150-1-daniel.lezcano@linaro.org (mailing list archive)
State Not Applicable, archived
Delegated to: Zhang Rui
Headers show
Series [1/2] thermal/drivers/core: Add init section table for self-encapsulation | expand

Commit Message

Daniel Lezcano June 12, 2019, 8:13 p.m. UTC 
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@linaro.org>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
---
 drivers/thermal/thermal_core.h    | 15 +++++++++++++++
 include/asm-generic/vmlinux.lds.h | 11 +++++++++++
 2 files changed, 26 insertions(+)

Comments

Daniel Lezcano June 24, 2019, 7:32 a.m. UTC | #1 
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@linaro.org>
> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.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()
>  
>
Zhang, Rui June 27, 2019, 1:21 p.m. UTC | #2 
On 一, 2019-06-24 at 09:32 +0200, Daniel Lezcano wrote:
> Any chance this patch gets merged for v5.4?
> 
> Thanks
>   -- Daniel
> 

have you run compile test for the patch?
I got the following errors when compiling.

In file included from drivers/thermal/fair_share.c:16:0:
drivers/thermal/thermal_core.h:23:3: error: expected identifier or ‘(’
before ‘static’
  (static typeof(name) *__thermal_table_entry_##name \
   ^
drivers/thermal/thermal_core.h:26:40: note: in expansion of macro
‘THERMAL_TABLE_ENTRY’
 #define THERMAL_GOVERNOR_DECLARE(name) THERMAL_TABLE_ENTRY(governor,
name)
                                        ^
drivers/thermal/fair_share.c:120:1: note: in expansion of macro
‘THERMAL_GOVERNOR_DECLARE’
 THERMAL_GOVERNOR_DECLARE(thermal_gov_fair_share);
 ^
drivers/thermal/fair_share.c:116:32: warning: ‘thermal_gov_fair_share’
defined but not used [-Wunused-variable]
 static struct thermal_governor thermal_gov_fair_share = {
                                ^
make[2]: *** [drivers/thermal/fair_share.o] Error 1
make[2]: *** Waiting for unfinished jobs....
In file included from drivers/thermal/gov_bang_bang.c:14:0:
drivers/thermal/thermal_core.h:23:3: error: expected identifier or ‘(’
before ‘static’
  (static typeof(name) *__thermal_table_entry_##name \
   ^
drivers/thermal/thermal_core.h:26:40: note: in expansion of macro
‘THERMAL_TABLE_ENTRY’
 #define THERMAL_GOVERNOR_DECLARE(name) THERMAL_TABLE_ENTRY(governor,
name)
                                        ^
drivers/thermal/gov_bang_bang.c:119:1: note: in expansion of macro
‘THERMAL_GOVERNOR_DECLARE’
 THERMAL_GOVERNOR_DECLARE(thermal_gov_bang_bang);
 ^
drivers/thermal/gov_bang_bang.c:115:32: warning:
‘thermal_gov_bang_bang’ defined but not used [-Wunused-variable]
 static struct thermal_governor thermal_gov_bang_bang = {
                                ^
make[2]: *** [drivers/thermal/gov_bang_bang.o] Error 1
make[1]: *** [drivers/thermal] Error 2
make[1]: *** Waiting for unfinished jobs....
make: *** [drivers] Error 2

Fix the problem by removing the round brackets
of THERMAL_TABLE_ENTRY(), and applied.

thanks,
rui
> 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@linaro.org>
> > Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.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()
> >  
> > 
>
Daniel Lezcano June 27, 2019, 1:31 p.m. UTC | #3 
On 27/06/2019 15:21, Zhang Rui wrote:
> On 一, 2019-06-24 at 09:32 +0200, Daniel Lezcano wrote:
>> Any chance this patch gets merged for v5.4?
>>
>> Thanks
>>   -- Daniel
>>
> 
> have you run compile test for the patch?
> I got the following errors when compiling.

Yes I did and also booted, changed the governor at runtime, etc ... I
already got this error and fixed it. I probably forgot to fold or commit
the fix ... :/


> In file included from drivers/thermal/fair_share.c:16:0:
> drivers/thermal/thermal_core.h:23:3: error: expected identifier or ‘(’
> before ‘static’
>   (static typeof(name) *__thermal_table_entry_##name \
>    ^
> drivers/thermal/thermal_core.h:26:40: note: in expansion of macro
> ‘THERMAL_TABLE_ENTRY’
>  #define THERMAL_GOVERNOR_DECLARE(name) THERMAL_TABLE_ENTRY(governor,
> name)
>                                         ^

[ ... ]

>                                 ^
> make[2]: *** [drivers/thermal/gov_bang_bang.o] Error 1
> make[1]: *** [drivers/thermal] Error 2
> make[1]: *** Waiting for unfinished jobs....
> make: *** [drivers] Error 2
> 
> Fix the problem by removing the round brackets
> of THERMAL_TABLE_ENTRY(), and applied.

Ok, thanks for fixing it!

  -- Daniel
diff mbox series

Patch

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()