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SubjectRe: [PATCH 04/35] lmb: Add lmb_find_area()
On 05/13/2010 07:16 PM, Benjamin Herrenschmidt wrote:
> On Thu, 2010-05-13 at 17:19 -0700, Yinghai Lu wrote:
>> it is a wrapper for lmb_find_base
>>
>> make it more easy for x86 to use lmb. ( rebase )
>> x86 early_res is using find/reserve pattern instead of alloc.
>>
>> -v2: Change name to lmb_find_area() according to Michael Ellerman
>> -v3: Add generic weak version __lmb_find_area()
>> so keep the path for fallback to x86 version that handle from low
>>
>> Signed-off-by: Yinghai Lu <yinghai@kernel.org>
>> ---
>> include/linux/lmb.h | 4 ++++
>> lib/lmb.c | 27 ++++++++++++++++++++++++++-
>> 2 files changed, 30 insertions(+), 1 deletions(-)
>>
>> diff --git a/include/linux/lmb.h b/include/linux/lmb.h
>> index 0b073a3..3c23dc8 100644
>> --- a/include/linux/lmb.h
>> +++ b/include/linux/lmb.h
>> @@ -44,6 +44,10 @@ extern struct lmb lmb;
>> extern int lmb_debug;
>> extern struct lmb_region lmb_reserved_init_regions[];
>>
>> +u64 __lmb_find_area(u64 ei_start, u64 ei_last, u64 start, u64 end,
>> + u64 size, u64 align);
>> +u64 lmb_find_area(u64 start, u64 end, u64 size, u64 align);
>
> See my comments about sorting out the return from that function.
>
> Also, I don't understand the need for that __ version. It looks like
> something you should keep inside x86, I don't see the need for it in the
> generic LMB code, since it just does trivial cropping of the arguments.

otherwise need to export lmb_find_base() and LMB_ERROR

>
> Also "ei_last" and "ei_start" are pretty bad names for its arguments
> anyways. To some extent I wonder if the caller should be responsible for
> doing the cropping in the first place.

yes. but need that to keep switch from early_res/nobootmem to lmb/nobootmem smooth.

will clean it after early_res is replaced.

>
> Cheers,
> Ben.
>
>> extern void __init lmb_init(void);
>> extern void __init lmb_analyze(void);
>> extern long lmb_add(phys_addr_t base, phys_addr_t size);
>> diff --git a/lib/lmb.c b/lib/lmb.c
>> index 6d49a17..f917dbf 100644
>> --- a/lib/lmb.c
>> +++ b/lib/lmb.c
>> @@ -155,6 +155,31 @@ static phys_addr_t __init lmb_find_base(phys_addr_t size, phys_addr_t align,
>> return LMB_ERROR;
>> }
>>
>> +u64 __init __weak __lmb_find_area(u64 ei_start, u64 ei_last, u64 start, u64 end,
>> + u64 size, u64 align)
>> +{
>> + u64 final_start, final_end;
>> + u64 mem;
>> +
>> + final_start = max(ei_start, start);
>> + final_end = min(ei_last, end);
>> +
>> + if (final_start >= final_end)
>> + return LMB_ERROR;
>> +
>> + mem = lmb_find_base(size, align, final_start, final_end);
>> +
>> + return mem;
>> +}
>> +
>> +/*
>> + * Find a free area with specified alignment in a specific range.
>> + */
>> +u64 __init __weak lmb_find_area(u64 start, u64 end, u64 size, u64 align)
>> +{
>> + return lmb_find_base(size, align, start, end);
>> +}
>> +
>> static void __init_lmb lmb_remove_region(struct lmb_type *type, unsigned long r)
>> {
>> unsigned long i;
>> @@ -199,7 +224,7 @@ static int __init_lmb lmb_double_array(struct lmb_type *type)
>> new_array = kmalloc(new_size, GFP_KERNEL);
>> addr = new_array == NULL ? LMB_ERROR : __pa(new_array);
>> } else
>> - addr = lmb_find_base(new_size, sizeof(struct lmb_region), 0, LMB_ALLOC_ACCESSIBLE);
>> + addr = lmb_find_area(0, lmb.current_limit, new_size, sizeof(struct lmb_region));
>> if (addr == LMB_ERROR) {
>> pr_err("lmb: Failed to double %s array from %ld to %ld entries !\n",
>> lmb_type_name(type), type->max, type->max * 2);
>



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