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memblock: split memblock_find_base() out of __memblock_alloc_base() 

This will be used by the array resize code and might prove useful
to some arch code as well at which point it can be made non-static.

Also add comment as to why aligning size is important

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
---

v2. Fix loss of size alignment
v3. Fix result code
This commit is contained in:
Benjamin Herrenschmidt 2010-07-12 14:24:57 +10:00
parent 7590abe891
commit 7f219c736f
1 changed files with 38 additions and 20 deletions
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58
mm/memblock.c
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@ -345,12 +345,15 @@ phys_addr_t __init memblock_alloc_nid(phys_addr_t size, phys_addr_t align, int n
BUG_ON(0 == size);
/* We align the size to limit fragmentation. Without this, a lot of
* small allocs quickly eat up the whole reserve array on sparc
*/
size = memblock_align_up(size, align);
/* We do a bottom-up search for a region with the right
* nid since that's easier considering how memblock_nid_range()
* works
*/
size = memblock_align_up(size, align);
for (i = 0; i < mem->cnt; i++) {
phys_addr_t ret = memblock_alloc_nid_region(&mem->regions[i],
size, align, nid);
@ -366,20 +369,7 @@ phys_addr_t __init memblock_alloc(phys_addr_t size, phys_addr_t align)
return memblock_alloc_base(size, align, MEMBLOCK_ALLOC_ACCESSIBLE);
}
phys_addr_t __init memblock_alloc_base(phys_addr_t size, phys_addr_t align, phys_addr_t max_addr)
{
phys_addr_t alloc;
alloc = __memblock_alloc_base(size, align, max_addr);
if (alloc == 0)
panic("ERROR: Failed to allocate 0x%llx bytes below 0x%llx.\n",
(unsigned long long) size, (unsigned long long) max_addr);
return alloc;
}
phys_addr_t __init __memblock_alloc_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 max_addr)
{
long i;
phys_addr_t base = 0;
@ -387,8 +377,6 @@ phys_addr_t __init __memblock_alloc_base(phys_addr_t size, phys_addr_t align, ph
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;
@ -405,13 +393,43 @@ phys_addr_t __init __memblock_alloc_base(phys_addr_t size, phys_addr_t align, ph
continue;
base = min(memblockbase + memblocksize, max_addr);
res_base = memblock_find_region(memblockbase, base, size, align);
if (res_base != MEMBLOCK_ERROR &&
memblock_add_region(&memblock.reserved, res_base, size) >= 0)
if (res_base != MEMBLOCK_ERROR)
return res_base;
}
return MEMBLOCK_ERROR;
}
phys_addr_t __init __memblock_alloc_base(phys_addr_t size, phys_addr_t align, phys_addr_t max_addr)
{
phys_addr_t found;
/* We align the size to limit fragmentation. Without this, a lot of
* small allocs quickly eat up the whole reserve array on sparc
*/
size = memblock_align_up(size, align);
found = memblock_find_base(size, align, max_addr);
if (found != MEMBLOCK_ERROR &&
memblock_add_region(&memblock.reserved, found, size) >= 0)
return found;
return 0;
}
phys_addr_t __init memblock_alloc_base(phys_addr_t size, phys_addr_t align, phys_addr_t max_addr)
{
phys_addr_t alloc;
alloc = __memblock_alloc_base(size, align, max_addr);
if (alloc == 0)
panic("ERROR: Failed to allocate 0x%llx bytes below 0x%llx.\n",
(unsigned long long) size, (unsigned long long) max_addr);
return alloc;
}
/* You must call memblock_analyze() before this. */
phys_addr_t __init memblock_phys_mem_size(void)
{