[PATCH v7 1/5] of/serial: move earlycon early_param handling to serial

[PATCH v7 1/5] of/serial: move earlycon early_param handling to serial

[Aleksey Makarov]

From: Leif Lindholm <leif.lindholm@linaro.org>

We have multiple "earlycon" early_param handlers - merge the DT one into
the main earlycon one.  It's a cleanup that also will be useful
to defer setting up DT console until ACPI/DT decision is made.

Rename the exported function to avoid clashing with the function from
arch/microblaze/kernel/prom.c

Signed-off-by: Leif Lindholm <leif.lindholm@linaro.org>
Signed-off-by: Aleksey Makarov <aleksey.makarov@linaro.org>
Acked-by: Rob Herring <robh@kernel.org>
---
 drivers/of/fdt.c              | 11 +----------
 drivers/tty/serial/earlycon.c |  2 +-
 include/linux/of_fdt.h        |  2 ++
 3 files changed, 4 insertions(+), 11 deletions(-)

diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
index 3349d2a..b50f775 100644
--- a/drivers/of/fdt.c
+++ b/drivers/of/fdt.c
@@ -805,7 +805,7 @@ static inline void early_init_dt_check_for_initrd(unsigned long node)
 
 #ifdef CONFIG_SERIAL_EARLYCON
 
-static int __init early_init_dt_scan_chosen_serial(void)
+int __init early_init_dt_scan_chosen_stdout(void)
 {
 	int offset;
 	const char *p, *q, *options = NULL;
@@ -849,15 +849,6 @@ static int __init early_init_dt_scan_chosen_serial(void)
 	}
 	return -ENODEV;
 }
-
-static int __init setup_of_earlycon(char *buf)
-{
-	if (buf)
-		return 0;
-
-	return early_init_dt_scan_chosen_serial();
-}
-early_param("earlycon", setup_of_earlycon);
 #endif
 
 /**
diff --git a/drivers/tty/serial/earlycon.c b/drivers/tty/serial/earlycon.c
index 067783f..7aae655 100644
--- a/drivers/tty/serial/earlycon.c
+++ b/drivers/tty/serial/earlycon.c
@@ -209,7 +209,7 @@ static int __init param_setup_earlycon(char *buf)
 	 * don't generate a warning from parse_early_params() in that case
 	 */
 	if (!buf || !buf[0])
-		return 0;
+		return early_init_dt_scan_chosen_stdout();
 
 	err = setup_earlycon(buf);
 	if (err == -ENOENT || err == -EALREADY)
diff --git a/include/linux/of_fdt.h b/include/linux/of_fdt.h
index 2fbe868..5cfe322 100644
--- a/include/linux/of_fdt.h
+++ b/include/linux/of_fdt.h
@@ -63,6 +63,7 @@ extern int early_init_dt_scan_chosen(unsigned long node, const char *uname,
 				     int depth, void *data);
 extern int early_init_dt_scan_memory(unsigned long node, const char *uname,
 				     int depth, void *data);
+extern int early_init_dt_scan_chosen_stdout(void);
 extern void early_init_fdt_scan_reserved_mem(void);
 extern void early_init_fdt_reserve_self(void);
 extern void early_init_dt_add_memory_arch(u64 base, u64 size);
@@ -91,6 +92,7 @@ extern void early_get_first_memblock_info(void *, phys_addr_t *);
 extern u64 of_flat_dt_translate_address(unsigned long node);
 extern void of_fdt_limit_memory(int limit);
 #else /* CONFIG_OF_FLATTREE */
+static inline int early_init_dt_scan_chosen_stdout(void) { return -ENODEV; }
 static inline void early_init_fdt_scan_reserved_mem(void) {}
 static inline void early_init_fdt_reserve_self(void) {}
 static inline const char *of_flat_dt_get_machine_name(void) { return NULL; }
-- 
2.7.4

Re: [PATCH v7 1/5] of/serial: move earlycon early_param handling to serial

[Greg Kroah-Hartman]

On Thu, Mar 31, 2016 at 04:40:23PM +0300, Aleksey Makarov wrote:
> From: Leif Lindholm <leif.lindholm-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
> 
> We have multiple "earlycon" early_param handlers - merge the DT one into
> the main earlycon one.  It's a cleanup that also will be useful
> to defer setting up DT console until ACPI/DT decision is made.
> 
> Rename the exported function to avoid clashing with the function from
> arch/microblaze/kernel/prom.c
> 
> Signed-off-by: Leif Lindholm <leif.lindholm-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
> Signed-off-by: Aleksey Makarov <aleksey.makarov-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
> Acked-by: Rob Herring <robh-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
> ---
>  drivers/of/fdt.c              | 11 +----------
>  drivers/tty/serial/earlycon.c |  2 +-
>  include/linux/of_fdt.h        |  2 ++
>  3 files changed, 4 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
> index 3349d2a..b50f775 100644
> --- a/drivers/of/fdt.c
> +++ b/drivers/of/fdt.c
> @@ -805,7 +805,7 @@ static inline void early_init_dt_check_for_initrd(unsigned long node)
>  
>  #ifdef CONFIG_SERIAL_EARLYCON
>  
> -static int __init early_init_dt_scan_chosen_serial(void)
> +int __init early_init_dt_scan_chosen_stdout(void)
>  {
>  	int offset;
>  	const char *p, *q, *options = NULL;
> @@ -849,15 +849,6 @@ static int __init early_init_dt_scan_chosen_serial(void)
>  	}
>  	return -ENODEV;
>  }
> -
> -static int __init setup_of_earlycon(char *buf)
> -{
> -	if (buf)
> -		return 0;
> -
> -	return early_init_dt_scan_chosen_serial();
> -}
> -early_param("earlycon", setup_of_earlycon);
>  #endif
>  
>  /**
> diff --git a/drivers/tty/serial/earlycon.c b/drivers/tty/serial/earlycon.c
> index 067783f..7aae655 100644
> --- a/drivers/tty/serial/earlycon.c
> +++ b/drivers/tty/serial/earlycon.c
> @@ -209,7 +209,7 @@ static int __init param_setup_earlycon(char *buf)
>  	 * don't generate a warning from parse_early_params() in that case
>  	 */
>  	if (!buf || !buf[0])
> -		return 0;
> +		return early_init_dt_scan_chosen_stdout();
>  
>  	err = setup_earlycon(buf);
>  	if (err == -ENOENT || err == -EALREADY)
> diff --git a/include/linux/of_fdt.h b/include/linux/of_fdt.h
> index 2fbe868..5cfe322 100644
> --- a/include/linux/of_fdt.h
> +++ b/include/linux/of_fdt.h
> @@ -63,6 +63,7 @@ extern int early_init_dt_scan_chosen(unsigned long node, const char *uname,
>  				     int depth, void *data);
>  extern int early_init_dt_scan_memory(unsigned long node, const char *uname,
>  				     int depth, void *data);
> +extern int early_init_dt_scan_chosen_stdout(void);
>  extern void early_init_fdt_scan_reserved_mem(void);
>  extern void early_init_fdt_reserve_self(void);
>  extern void early_init_dt_add_memory_arch(u64 base, u64 size);
> @@ -91,6 +92,7 @@ extern void early_get_first_memblock_info(void *, phys_addr_t *);
>  extern u64 of_flat_dt_translate_address(unsigned long node);
>  extern void of_fdt_limit_memory(int limit);
>  #else /* CONFIG_OF_FLATTREE */
> +static inline int early_init_dt_scan_chosen_stdout(void) { return -ENODEV; }

Doesn't this change the default logic?  Today you are returning 0 if you
don't have this config option set, and now you return -ENODEV, did you
test this out?

thanks,

greg k-h
--
To unsubscribe from this list: send the line "unsubscribe devicetree" in
the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html

Re: [PATCH v7 1/5] of/serial: move earlycon early_param handling to serial

[Aleksey Makarov]

On 03/31/2016 07:32 PM, Greg Kroah-Hartman wrote:
> On Thu, Mar 31, 2016 at 04:40:23PM +0300, Aleksey Makarov wrote:
>> From: Leif Lindholm <leif.lindholm@linaro.org>
>>
>> We have multiple "earlycon" early_param handlers - merge the DT one into
>> the main earlycon one.  It's a cleanup that also will be useful
>> to defer setting up DT console until ACPI/DT decision is made.
>>
>> Rename the exported function to avoid clashing with the function from
>> arch/microblaze/kernel/prom.c
>>
>> Signed-off-by: Leif Lindholm <leif.lindholm@linaro.org>
>> Signed-off-by: Aleksey Makarov <aleksey.makarov@linaro.org>
>> Acked-by: Rob Herring <robh@kernel.org>
>> ---
>>  drivers/of/fdt.c              | 11 +----------
>>  drivers/tty/serial/earlycon.c |  2 +-
>>  include/linux/of_fdt.h        |  2 ++
>>  3 files changed, 4 insertions(+), 11 deletions(-)
>>
>> diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
>> index 3349d2a..b50f775 100644
>> --- a/drivers/of/fdt.c
>> +++ b/drivers/of/fdt.c
>> @@ -805,7 +805,7 @@ static inline void early_init_dt_check_for_initrd(unsigned long node)
>>  
>>  #ifdef CONFIG_SERIAL_EARLYCON
>>  
>> -static int __init early_init_dt_scan_chosen_serial(void)
>> +int __init early_init_dt_scan_chosen_stdout(void)
>>  {
>>  	int offset;
>>  	const char *p, *q, *options = NULL;
>> @@ -849,15 +849,6 @@ static int __init early_init_dt_scan_chosen_serial(void)
>>  	}
>>  	return -ENODEV;
>>  }
>> -
>> -static int __init setup_of_earlycon(char *buf)
>> -{
>> -	if (buf)
>> -		return 0;
>> -
>> -	return early_init_dt_scan_chosen_serial();
>> -}
>> -early_param("earlycon", setup_of_earlycon);
>>  #endif
>>  
>>  /**
>> diff --git a/drivers/tty/serial/earlycon.c b/drivers/tty/serial/earlycon.c
>> index 067783f..7aae655 100644
>> --- a/drivers/tty/serial/earlycon.c
>> +++ b/drivers/tty/serial/earlycon.c
>> @@ -209,7 +209,7 @@ static int __init param_setup_earlycon(char *buf)
>>  	 * don't generate a warning from parse_early_params() in that case
>>  	 */
>>  	if (!buf || !buf[0])
>> -		return 0;
>> +		return early_init_dt_scan_chosen_stdout();
>>  
>>  	err = setup_earlycon(buf);
>>  	if (err == -ENOENT || err == -EALREADY)
>> diff --git a/include/linux/of_fdt.h b/include/linux/of_fdt.h
>> index 2fbe868..5cfe322 100644
>> --- a/include/linux/of_fdt.h
>> +++ b/include/linux/of_fdt.h
>> @@ -63,6 +63,7 @@ extern int early_init_dt_scan_chosen(unsigned long node, const char *uname,
>>  				     int depth, void *data);
>>  extern int early_init_dt_scan_memory(unsigned long node, const char *uname,
>>  				     int depth, void *data);
>> +extern int early_init_dt_scan_chosen_stdout(void);
>>  extern void early_init_fdt_scan_reserved_mem(void);
>>  extern void early_init_fdt_reserve_self(void);
>>  extern void early_init_dt_add_memory_arch(u64 base, u64 size);
>> @@ -91,6 +92,7 @@ extern void early_get_first_memblock_info(void *, phys_addr_t *);
>>  extern u64 of_flat_dt_translate_address(unsigned long node);
>>  extern void of_fdt_limit_memory(int limit);
>>  #else /* CONFIG_OF_FLATTREE */
>> +static inline int early_init_dt_scan_chosen_stdout(void) { return -ENODEV; }
> 
> Doesn't this change the default logic?  Today you are returning 0 if you
> don't have this config option set,

I am not sure I understand this.  Which return value do you mean?

1. early_init_dt_scan_chosen_stdout()

Today if CONFIG_OF_FLATTREE is not set then early_init_dt_scan_chosen_stdout() does not exist.

2. param_setup_earlycon()

Today we have 2 handlers for "earlycon" option.  One (in fdt.c) is for the option without args,
and another (earlycon.c) always expects agrs.  But both return 0 for the opposite cases becasue they
can not check what another hander returns.

Now we have just one handler and it can return correct value.

>  and now you return -ENODEV, did you
> test this out?

Yes, I tested it.

Thank you
Aleksey Makarov

> 
> thanks,
> 
> greg k-h
> 

Re: [PATCH v7 1/5] of/serial: move earlycon early_param handling to serial

[Greg Kroah-Hartman]

On Thu, Mar 31, 2016 at 08:04:20PM +0300, Aleksey Makarov wrote:
> 
> 
> On 03/31/2016 07:32 PM, Greg Kroah-Hartman wrote:
> > On Thu, Mar 31, 2016 at 04:40:23PM +0300, Aleksey Makarov wrote:
> >> From: Leif Lindholm <leif.lindholm@linaro.org>
> >>
> >> We have multiple "earlycon" early_param handlers - merge the DT one into
> >> the main earlycon one.  It's a cleanup that also will be useful
> >> to defer setting up DT console until ACPI/DT decision is made.
> >>
> >> Rename the exported function to avoid clashing with the function from
> >> arch/microblaze/kernel/prom.c
> >>
> >> Signed-off-by: Leif Lindholm <leif.lindholm@linaro.org>
> >> Signed-off-by: Aleksey Makarov <aleksey.makarov@linaro.org>
> >> Acked-by: Rob Herring <robh@kernel.org>
> >> ---
> >>  drivers/of/fdt.c              | 11 +----------
> >>  drivers/tty/serial/earlycon.c |  2 +-
> >>  include/linux/of_fdt.h        |  2 ++
> >>  3 files changed, 4 insertions(+), 11 deletions(-)
> >>
> >> diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
> >> index 3349d2a..b50f775 100644
> >> --- a/drivers/of/fdt.c
> >> +++ b/drivers/of/fdt.c
> >> @@ -805,7 +805,7 @@ static inline void early_init_dt_check_for_initrd(unsigned long node)
> >>  
> >>  #ifdef CONFIG_SERIAL_EARLYCON
> >>  
> >> -static int __init early_init_dt_scan_chosen_serial(void)
> >> +int __init early_init_dt_scan_chosen_stdout(void)
> >>  {
> >>  	int offset;
> >>  	const char *p, *q, *options = NULL;
> >> @@ -849,15 +849,6 @@ static int __init early_init_dt_scan_chosen_serial(void)
> >>  	}
> >>  	return -ENODEV;
> >>  }
> >> -
> >> -static int __init setup_of_earlycon(char *buf)
> >> -{
> >> -	if (buf)
> >> -		return 0;
> >> -
> >> -	return early_init_dt_scan_chosen_serial();
> >> -}
> >> -early_param("earlycon", setup_of_earlycon);
> >>  #endif
> >>  
> >>  /**
> >> diff --git a/drivers/tty/serial/earlycon.c b/drivers/tty/serial/earlycon.c
> >> index 067783f..7aae655 100644
> >> --- a/drivers/tty/serial/earlycon.c
> >> +++ b/drivers/tty/serial/earlycon.c
> >> @@ -209,7 +209,7 @@ static int __init param_setup_earlycon(char *buf)
> >>  	 * don't generate a warning from parse_early_params() in that case
> >>  	 */
> >>  	if (!buf || !buf[0])
> >> -		return 0;
> >> +		return early_init_dt_scan_chosen_stdout();
> >>  
> >>  	err = setup_earlycon(buf);
> >>  	if (err == -ENOENT || err == -EALREADY)
> >> diff --git a/include/linux/of_fdt.h b/include/linux/of_fdt.h
> >> index 2fbe868..5cfe322 100644
> >> --- a/include/linux/of_fdt.h
> >> +++ b/include/linux/of_fdt.h
> >> @@ -63,6 +63,7 @@ extern int early_init_dt_scan_chosen(unsigned long node, const char *uname,
> >>  				     int depth, void *data);
> >>  extern int early_init_dt_scan_memory(unsigned long node, const char *uname,
> >>  				     int depth, void *data);
> >> +extern int early_init_dt_scan_chosen_stdout(void);
> >>  extern void early_init_fdt_scan_reserved_mem(void);
> >>  extern void early_init_fdt_reserve_self(void);
> >>  extern void early_init_dt_add_memory_arch(u64 base, u64 size);
> >> @@ -91,6 +92,7 @@ extern void early_get_first_memblock_info(void *, phys_addr_t *);
> >>  extern u64 of_flat_dt_translate_address(unsigned long node);
> >>  extern void of_fdt_limit_memory(int limit);
> >>  #else /* CONFIG_OF_FLATTREE */
> >> +static inline int early_init_dt_scan_chosen_stdout(void) { return -ENODEV; }
> > 
> > Doesn't this change the default logic?  Today you are returning 0 if you
> > don't have this config option set,
> 
> I am not sure I understand this.  Which return value do you mean?
> 
> 1. early_init_dt_scan_chosen_stdout()
> 
> Today if CONFIG_OF_FLATTREE is not set then early_init_dt_scan_chosen_stdout() does not exist.

It "exists" in that you return -ENODEV, right?  Look at the place where
you called this function, previously you returned 0, now you return this
function call's return value.

> 2. param_setup_earlycon()
> 
> Today we have 2 handlers for "earlycon" option.  One (in fdt.c) is for the option without args,
> and another (earlycon.c) always expects agrs.  But both return 0 for the opposite cases becasue they
> can not check what another hander returns.
> 
> Now we have just one handler and it can return correct value.

I don't understand.

> >  and now you return -ENODEV, did you
> > test this out?
> 
> Yes, I tested it.

On what platforms?  With what configurations?

thanks,

greg k-h

Re: [PATCH v7 1/5] of/serial: move earlycon early_param handling to serial

[Aleksey Makarov]

On 03/31/2016 08:37 PM, Greg Kroah-Hartman wrote:
> On Thu, Mar 31, 2016 at 08:04:20PM +0300, Aleksey Makarov wrote:
>>
>>
>> On 03/31/2016 07:32 PM, Greg Kroah-Hartman wrote:
>>> On Thu, Mar 31, 2016 at 04:40:23PM +0300, Aleksey Makarov wrote:
>>>> From: Leif Lindholm <leif.lindholm@linaro.org>
>>>>
>>>> We have multiple "earlycon" early_param handlers - merge the DT one into
>>>> the main earlycon one.  It's a cleanup that also will be useful
>>>> to defer setting up DT console until ACPI/DT decision is made.
>>>>
>>>> Rename the exported function to avoid clashing with the function from
>>>> arch/microblaze/kernel/prom.c
>>>>
>>>> Signed-off-by: Leif Lindholm <leif.lindholm@linaro.org>
>>>> Signed-off-by: Aleksey Makarov <aleksey.makarov@linaro.org>
>>>> Acked-by: Rob Herring <robh@kernel.org>
>>>> ---
>>>>  drivers/of/fdt.c              | 11 +----------
>>>>  drivers/tty/serial/earlycon.c |  2 +-
>>>>  include/linux/of_fdt.h        |  2 ++
>>>>  3 files changed, 4 insertions(+), 11 deletions(-)
>>>>
>>>> diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
>>>> index 3349d2a..b50f775 100644
>>>> --- a/drivers/of/fdt.c
>>>> +++ b/drivers/of/fdt.c
>>>> @@ -805,7 +805,7 @@ static inline void early_init_dt_check_for_initrd(unsigned long node)
>>>>  
>>>>  #ifdef CONFIG_SERIAL_EARLYCON
>>>>  
>>>> -static int __init early_init_dt_scan_chosen_serial(void)
>>>> +int __init early_init_dt_scan_chosen_stdout(void)
>>>>  {
>>>>  	int offset;
>>>>  	const char *p, *q, *options = NULL;
>>>> @@ -849,15 +849,6 @@ static int __init early_init_dt_scan_chosen_serial(void)
>>>>  	}
>>>>  	return -ENODEV;
>>>>  }
>>>> -
>>>> -static int __init setup_of_earlycon(char *buf)
>>>> -{
>>>> -	if (buf)
>>>> -		return 0;
>>>> -
>>>> -	return early_init_dt_scan_chosen_serial();
>>>> -}
>>>> -early_param("earlycon", setup_of_earlycon);
>>>>  #endif
>>>>  
>>>>  /**
>>>> diff --git a/drivers/tty/serial/earlycon.c b/drivers/tty/serial/earlycon.c
>>>> index 067783f..7aae655 100644
>>>> --- a/drivers/tty/serial/earlycon.c
>>>> +++ b/drivers/tty/serial/earlycon.c
>>>> @@ -209,7 +209,7 @@ static int __init param_setup_earlycon(char *buf)
>>>>  	 * don't generate a warning from parse_early_params() in that case
>>>>  	 */
>>>>  	if (!buf || !buf[0])
>>>> -		return 0;
>>>> +		return early_init_dt_scan_chosen_stdout();
>>>>  
>>>>  	err = setup_earlycon(buf);
>>>>  	if (err == -ENOENT || err == -EALREADY)
>>>> diff --git a/include/linux/of_fdt.h b/include/linux/of_fdt.h
>>>> index 2fbe868..5cfe322 100644
>>>> --- a/include/linux/of_fdt.h
>>>> +++ b/include/linux/of_fdt.h
>>>> @@ -63,6 +63,7 @@ extern int early_init_dt_scan_chosen(unsigned long node, const char *uname,
>>>>  				     int depth, void *data);
>>>>  extern int early_init_dt_scan_memory(unsigned long node, const char *uname,
>>>>  				     int depth, void *data);
>>>> +extern int early_init_dt_scan_chosen_stdout(void);
>>>>  extern void early_init_fdt_scan_reserved_mem(void);
>>>>  extern void early_init_fdt_reserve_self(void);
>>>>  extern void early_init_dt_add_memory_arch(u64 base, u64 size);
>>>> @@ -91,6 +92,7 @@ extern void early_get_first_memblock_info(void *, phys_addr_t *);
>>>>  extern u64 of_flat_dt_translate_address(unsigned long node);
>>>>  extern void of_fdt_limit_memory(int limit);
>>>>  #else /* CONFIG_OF_FLATTREE */
>>>> +static inline int early_init_dt_scan_chosen_stdout(void) { return -ENODEV; }
>>>
>>> Doesn't this change the default logic?  Today you are returning 0 if you
>>> don't have this config option set,
>>
>> I am not sure I understand this.  Which return value do you mean?
>>
>> 1. early_init_dt_scan_chosen_stdout()
>>
>> Today if CONFIG_OF_FLATTREE is not set then early_init_dt_scan_chosen_stdout() does not exist.
> 
> It "exists" in that you return -ENODEV, right?  Look at the place where
> you called this function,

It's param_setup_earlycon() so see below for explanations.

> previously you returned 0, now you return this
> function call's return value.
> 
>> 2. param_setup_earlycon()
>>
>> Today we have 2 handlers for "earlycon" option.  One (in fdt.c) is for the option without args,
>> and another (earlycon.c) always expects agrs.  But both return 0 for the opposite cases becasue they
>> can not check what another hander returns.
>>
>> Now we have just one handler and it can return correct value.
> 
> I don't understand.

This patch deletes early_param("earlycon", setup_of_earlycon) from fdt.c and
keeps early_param("earlycon", param_setup_earlycon) in earlycon.c.

Assume "earlycon" kernel command line parameter was passed without arguments.

Before this patch:

early_init_dt_scan_chosen_stdout() is called from setup_of_earlycon()
where its return value is returned to parse_early_param()

After this patch:

early_init_dt_scan_chosen_stdout() is called from param_setup_earlycon()
so we should return its return value from param_setup_earlycon() if we want
to pass it to parse_early_param().

>>>  and now you return -ENODEV, did you
>>> test this out?
>>
>> Yes, I tested it.
> 
> On what platforms?  With what configurations?

platform: QEMU
configuration options: with/without acpi, dt
command line options: with/without "earlycon", "earlycon=..."

Thank you
Aleksey Makarov

Re: [PATCH v7 1/5] of/serial: move earlycon early_param handling to serial

[Peter Hurley]

On 03/31/2016 06:40 AM, Aleksey Makarov wrote:
> From: Leif Lindholm <leif.lindholm@linaro.org>
> 
> We have multiple "earlycon" early_param handlers - merge the DT one into
> the main earlycon one.  It's a cleanup that also will be useful
> to defer setting up DT console until ACPI/DT decision is made.
> 
> Rename the exported function to avoid clashing with the function from
> arch/microblaze/kernel/prom.c

Reviewed-by: Peter Hurley <peter@hurleysoftware.com>

Re: [PATCH v7 1/5] of/serial: move earlycon early_param handling to serial

[Greg Kroah-Hartman]

On Thu, Mar 31, 2016 at 04:40:23PM +0300, Aleksey Makarov wrote:
> From: Leif Lindholm <leif.lindholm@linaro.org>
> 
> We have multiple "earlycon" early_param handlers - merge the DT one into
> the main earlycon one.  It's a cleanup that also will be useful
> to defer setting up DT console until ACPI/DT decision is made.
> 
> Rename the exported function to avoid clashing with the function from
> arch/microblaze/kernel/prom.c
> 
> Signed-off-by: Leif Lindholm <leif.lindholm@linaro.org>
> Signed-off-by: Aleksey Makarov <aleksey.makarov@linaro.org>
> Acked-by: Rob Herring <robh@kernel.org>
> ---
>  drivers/of/fdt.c              | 11 +----------
>  drivers/tty/serial/earlycon.c |  2 +-
>  include/linux/of_fdt.h        |  2 ++
>  3 files changed, 4 insertions(+), 11 deletions(-)

Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>