linux-kernel - Re: [PATCH v4 3/7] arm/dt: consolidate atags setup into setup_machine

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Message-ID: <AANLkTinHn-FO7YCMqYKFGk_ob+CKUmbbX-P83kbTmhpe@mail.gmail.com>
Date:	Sat, 26 Mar 2011 00:44:08 -0600
From:	Grant Likely <grant.likely@...retlab.ca>
To:	Shawn Guo <shawn.guo@...escale.com>
Cc:	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	Nicolas Pitre <nicolas.pitre@...aro.org>,
	Russell King <linux@....linux.org.uk>
Subject: Re: [PATCH v4 3/7] arm/dt: consolidate atags setup into setup_machine_atags

On Sat, Feb 26, 2011 at 8:27 AM, Shawn Guo <shawn.guo@...escale.com> wrote:
> Hi Grant,
>
> One minor nitpicking below ...
>
> On Tue, Feb 22, 2011 at 07:22:19PM -0700, Grant Likely wrote:
>> In preparation for adding device tree support, this patch consolidates
>> all of the atag-specific setup into a single function.
>>
>> v4: - adapt to the removal of lookup_machine_type()
>>     - break out dump of machine_desc table into dump_machine_table()
>>       because the device tree probe code will use it.
>>     - Add for_each_machine_desc() macro
>>
>> Signed-off-by: Grant Likely <grant.likely@...retlab.ca>
>> ---
>>  arch/arm/include/asm/mach/arch.h |    7 ++++
>>  arch/arm/kernel/setup.c          |   74 +++++++++++++++++++++++---------------
>>  2 files changed, 51 insertions(+), 30 deletions(-)
>>
>> diff --git a/arch/arm/include/asm/mach/arch.h b/arch/arm/include/asm/mach/arch.h
>> index 3a0893a..ed9a10c 100644
>> --- a/arch/arm/include/asm/mach/arch.h
>> +++ b/arch/arm/include/asm/mach/arch.h
>> @@ -52,6 +52,13 @@ struct machine_desc {
>>  extern struct machine_desc *machine_desc;
>>
>>  /*
>> + * Machine type table - also only accessible during boot
>> + */
>> +extern struct machine_desc __arch_info_begin[], __arch_info_end[];
>> +#define for_each_machine_desc(p)                     \
>> +     for (p = __arch_info_begin; p < __arch_info_end; p++)
>> +
>> +/*
>>   * Set of macros to define architecture features.  This is built into
>>   * a table by the linker.
>>   */
>> diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c
>> index 8e046f1..e420565 100644
>> --- a/arch/arm/kernel/setup.c
>> +++ b/arch/arm/kernel/setup.c
>> @@ -439,25 +439,12 @@ void cpu_init(void)
>>           : "r14");
>>  }
>>
>> -static struct machine_desc * __init setup_machine(unsigned int nr)
>> +static void __init dump_machine_table(void)
>>  {
>> -     extern struct machine_desc __arch_info_begin[], __arch_info_end[];
>>       struct machine_desc *p;
>>
>> -     /*
>> -      * locate machine in the list of supported machines.
>> -      */
>> -     for (p = __arch_info_begin; p < __arch_info_end; p++)
>> -             if (nr == p->nr) {
>> -                     printk("Machine: %s\n", p->name);
>> -                     return p;
>> -             }
>> -
>> -     early_print("\n"
>> -             "Error: unrecognized/unsupported machine ID (r1 = 0x%08x).\n\n"
>> -             "Available machine support:\n\nID (hex)\tNAME\n", nr);
>> -
>> -     for (p = __arch_info_begin; p < __arch_info_end; p++)
>> +     early_print("Available machine support:\n\nID (hex)\tNAME\n");
>> +     for_each_machine_desc(p)
>>               early_print("%08x\t%s\n", p->nr, p->name);
>>
>>       early_print("\nPlease check your kernel config and/or bootloader.\n");
>> @@ -819,21 +806,29 @@ static void __init squash_mem_tags(struct tag *tag)
>>                       tag->hdr.tag = ATAG_NONE;
>>  }
>>
>> -void __init setup_arch(char **cmdline_p)
>> +static struct machine_desc * __init setup_machine_tags(unsigned int nr)
>>  {
>>       struct tag *tags = (struct tag *)&init_tags;
>> -     struct machine_desc *mdesc;
>> +     struct machine_desc *mdesc = NULL, *p;
>>       char *from = default_command_line;
>>
>> -     unwind_init();
>> +     /*
>> +      * locate machine in the list of supported machines.
>> +      */
>> +     for_each_machine_desc(p)
>> +             if (nr == p->nr) {
>> +                     printk("Machine: %s\n", p->name);
>
> Print once ...
>
>> +                     mdesc = p;
>> +                     break;
>> +             }
>>
>> -     setup_processor();
>> -     mdesc = setup_machine(machine_arch_type);
>> -     machine_desc = mdesc;
>> -     machine_name = mdesc->name;
>> +     if (!mdesc) {
>> +             early_print("\nError: unrecognized/unsupported machine ID"
>> +                     " (r1 = 0x%08x).\n\n", nr);
>> +             dump_machine_table(); /* does not return */
>> +     }
>>
>> -     if (mdesc->soft_reboot)
>> -             reboot_setup("s");
>> +     printk("Machine: %s\n", mdesc->name);
>>
> twice, which give something like:
>
> Uncompressing Linux... done, booting the kernel.
> [...]
> CPU: VIPT nonaliasing data cache, VIPT aliasing instruction cache
> Machine: Freescale MX51 Babbage Board
> Machine: Freescale MX51 Babbage Board
> Memory policy: ECC disabled, Data cache writeback

Fixed, thanks.

g.
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