linux-kernel - Re: [PATCH 4/9] of/flattree: Don't assume HAVE

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Date:	Sun, 14 Feb 2010 07:08:52 -0700
From:	Grant Likely <grant.likely@...retlab.ca>
To:	michal.simek@...alogix.com
Cc:	monstr@...str.eu, sfr@...b.auug.org.au, benh@...nel.crashing.org,
	jeremy.kerr@...onical.com, davem@...emloft.net,
	microblaze-uclinux@...e.uq.edu.au, linuxppc-dev@...abs.org,
	sparclinux@...r.kernel.org, devicetree-discuss@...ts.ozlabs.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/9] of/flattree: Don't assume HAVE_LMB

On Sun, Feb 14, 2010 at 7:00 AM, Michal Simek
<michal.simek@...alogix.com> wrote:
> Grant Likely wrote:
>>
>> From: Jeremy Kerr <jeremy.kerr@...onical.com>
>>
>> We don't always have lmb available, so make arches provide an
>> early_init_dt_alloc_memory_arch() to handle the allocation of
>> memory in the fdt code.
>>
>> When we don't have lmb.h included, we need asm/page.h for __va.
>>
>> Signed-off-by: Jeremy Kerr <jeremy.kerr@...onical.com>
>> Signed-off-by: Grant Likely <grant.likely@...retlab.ca>
>> ---
>>
>>  arch/microblaze/kernel/prom.c |    5 +++++
>>  arch/powerpc/kernel/prom.c    |    5 +++++
>>  drivers/of/fdt.c              |    9 ++++++---
>>  include/linux/of_fdt.h        |    1 +
>>  4 files changed, 17 insertions(+), 3 deletions(-)
>>
>> diff --git a/arch/microblaze/kernel/prom.c b/arch/microblaze/kernel/prom.c
>> index 050b799..a7dcaf0 100644
>> --- a/arch/microblaze/kernel/prom.c
>> +++ b/arch/microblaze/kernel/prom.c
>> @@ -55,6 +55,11 @@ void __init early_init_dt_add_memory_arch(u64 base, u64
>> size)
>>        lmb_add(base, size);
>>  }
>>  +u64 __init early_init_dt_alloc_memory_arch(u64 size, u64 align)
>> +{
>> +       return lmb_alloc(size, align);
>> +}
>> +
>>  #ifdef CONFIG_EARLY_PRINTK
>>  /* MS this is Microblaze specifig function */
>>  static int __init early_init_dt_scan_serial(unsigned long node,
>> diff --git a/arch/powerpc/kernel/prom.c b/arch/powerpc/kernel/prom.c
>> index 43c78d7..5bbbdb2 100644
>> --- a/arch/powerpc/kernel/prom.c
>> +++ b/arch/powerpc/kernel/prom.c
>> @@ -510,6 +510,11 @@ void __init early_init_dt_add_memory_arch(u64 base,
>> u64 size)
>>        memstart_addr = min((u64)memstart_addr, base);
>>  }
>>  +u64 __init early_init_dt_alloc_memory_arch(u64 size, u64 align)
>> +{
>> +       return lmb_alloc(size, align);
>> +}
>> +
>>  #ifdef CONFIG_BLK_DEV_INITRD
>>  void __init early_init_dt_setup_initrd_arch(unsigned long start,
>>                unsigned long end)
>> diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
>> index b51f797..406757a 100644
>> --- a/drivers/of/fdt.c
>> +++ b/drivers/of/fdt.c
>> @@ -10,16 +10,18 @@
>>  */
>>   #include <linux/kernel.h>
>> -#include <linux/lmb.h>
>>  #include <linux/initrd.h>
>>  #include <linux/of.h>
>>  #include <linux/of_fdt.h>
>> -
>> +#include <linux/string.h>
>> +#include <linux/errno.h>
>>   #ifdef CONFIG_PPC
>>  #include <asm/machdep.h>
>>  #endif /* CONFIG_PPC */
>
> It is not part of your patch but I think that will be great completely
> remove this CONFIG_PPC part from generic OF file.
> Would it be possible to include your asm/machdep.h through asm/page.h or any
> other file?

Yup.  I'll get there unless someone else beats me to it.  :-)

>
> Michal
>
>>  +#include <asm/page.h>
>> +
>>  int __initdata dt_root_addr_cells;
>>  int __initdata dt_root_size_cells;
>>  @@ -560,7 +562,8 @@ void __init unflatten_device_tree(void)
>>        pr_debug("  size is %lx, allocating...\n", size);
>>          /* Allocate memory for the expanded device tree */
>> -       mem = lmb_alloc(size + 4, __alignof__(struct device_node));
>> +       mem = early_init_dt_alloc_memory_arch(size + 4,
>> +                       __alignof__(struct device_node));
>>        mem = (unsigned long) __va(mem);
>>          ((__be32 *)mem)[size / 4] = cpu_to_be32(0xdeadbeef);
>> diff --git a/include/linux/of_fdt.h b/include/linux/of_fdt.h
>> index c9cb8a7..a1ca92c 100644
>> --- a/include/linux/of_fdt.h
>> +++ b/include/linux/of_fdt.h
>> @@ -78,6 +78,7 @@ extern void early_init_dt_check_for_initrd(unsigned long
>> node);
>>  extern int early_init_dt_scan_memory(unsigned long node, const char
>> *uname,
>>                                     int depth, void *data);
>>  extern void early_init_dt_add_memory_arch(u64 base, u64 size);
>> +extern u64 early_init_dt_alloc_memory_arch(u64 size, u64 align);
>>  extern u64 dt_mem_next_cell(int s, __be32 **cellp);
>>   /*
>>
>> --
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>
>
> --
> Michal Simek, Ing. (M.Eng)
> PetaLogix - Linux Solutions for a Reconfigurable World
> w: www.petalogix.com p: +61-7-30090663,+42-0-721842854 f: +61-7-30090663
>



-- 
Grant Likely, B.Sc., P.Eng.
Secret Lab Technologies Ltd.
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