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| author | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2010-07-12 15:00:34 +1000 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2010-08-05 12:56:22 +1000 |
| commit | fef501d49d31f997a3381b6c1efd5bca382b6b6f (patch) | |
| tree | d228dd686367dd3a49fc4152cef94d83b99dad29 /mm/memblock.c | |
| parent | d2cd563ba82c424083b78e0ce97d68bfb04d1242 (diff) | |
| download | lwn-fef501d49d31f997a3381b6c1efd5bca382b6b6f.tar.gz lwn-fef501d49d31f997a3381b6c1efd5bca382b6b6f.zip | |
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>
Diffstat (limited to 'mm/memblock.c')
| -rw-r--r-- | mm/memblock.c | 27 |
1 files changed, 16 insertions, 11 deletions
diff --git a/mm/memblock.c b/mm/memblock.c index 8715f09434df..468ff43a72b4 100644 --- a/mm/memblock.c +++ b/mm/memblock.c @@ -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; |