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@xxxxxxxxxx>
>>
>> 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@xxxxxxxxxx>
>> Signed-off-by: Aleksey Makarov <aleksey.makarov@xxxxxxxxxx>
>> Acked-by: Rob Herring <robh@xxxxxxxxxx>
>> ---
>> 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
>
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