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memblock: Add "start" argument to memblock_find_base() 

To constraint the search of a region between two boundaries,
which will be used by the new NUMA aware allocator among others.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Benjamin Herrenschmidt 2010-07-12 15:00:34 +10:00
parent d2cd563ba8
commit fef501d49d
1 changed files with 16 additions and 11 deletions
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27
mm/memblock.c
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@ -117,19 +117,18 @@ static phys_addr_t __init memblock_find_region(phys_addr_t start, phys_addr_t en
return MEMBLOCK_ERROR;
}
static phys_addr_t __init memblock_find_base(phys_addr_t size, phys_addr_t align, phys_addr_t max_addr)
static phys_addr_t __init memblock_find_base(phys_addr_t size, phys_addr_t align,
phys_addr_t start, phys_addr_t end)
{
long i;
phys_addr_t base = 0;
phys_addr_t res_base;
BUG_ON(0 == size);
size = memblock_align_up(size, align);
/* Pump up max_addr */
if (max_addr == MEMBLOCK_ALLOC_ACCESSIBLE)
max_addr = memblock.current_limit;
if (end == MEMBLOCK_ALLOC_ACCESSIBLE)
end = memblock.current_limit;
/* We do a top-down search, this tends to limit memory
* fragmentation by keeping early boot allocs near the
@ -138,13 +137,19 @@ static phys_addr_t __init memblock_find_base(phys_addr_t size, phys_addr_t align
for (i = memblock.memory.cnt - 1; i >= 0; i--) {
phys_addr_t memblockbase = memblock.memory.regions[i].base;
phys_addr_t memblocksize = memblock.memory.regions[i].size;
phys_addr_t bottom, top, found;
if (memblocksize < size)
continue;
base = min(memblockbase + memblocksize, max_addr);
res_base = memblock_find_region(memblockbase, base, size, align);
if (res_base != MEMBLOCK_ERROR)
return res_base;
if ((memblockbase + memblocksize) <= start)
break;
bottom = max(memblockbase, start);
top = min(memblockbase + memblocksize, end);
if (bottom >= top)
continue;
found = memblock_find_region(bottom, top, size, align);
if (found != MEMBLOCK_ERROR)
return found;
}
return MEMBLOCK_ERROR;
}
@ -204,7 +209,7 @@ static int memblock_double_array(struct memblock_type *type)
new_array = kmalloc(new_size, GFP_KERNEL);
addr = new_array == NULL ? MEMBLOCK_ERROR : __pa(new_array);
} else
addr = memblock_find_base(new_size, sizeof(phys_addr_t), MEMBLOCK_ALLOC_ACCESSIBLE);
addr = memblock_find_base(new_size, sizeof(phys_addr_t), 0, MEMBLOCK_ALLOC_ACCESSIBLE);
if (addr == MEMBLOCK_ERROR) {
pr_err("memblock: Failed to double %s array from %ld to %ld entries !\n",
memblock_type_name(type), type->max, type->max * 2);
@ -416,7 +421,7 @@ phys_addr_t __init __memblock_alloc_base(phys_addr_t size, phys_addr_t align, ph
*/
size = memblock_align_up(size, align);
found = memblock_find_base(size, align, max_addr);
found = memblock_find_base(size, align, 0, max_addr);
if (found != MEMBLOCK_ERROR &&
memblock_add_region(&memblock.reserved, found, size) >= 0)
return found;