diff options
| author | Yinghai Lu <yinghai@kernel.org> | 2012-10-22 16:35:18 -0700 |
|---|---|---|
| committer | H. Peter Anvin <hpa@linux.intel.com> | 2012-10-24 11:52:21 -0700 |
| commit | 6ede1fd3cb404c0016de6ac529df46d561bd558b (patch) | |
| tree | c5537b527a5a065fff2bd9b33d003561a0d87206 /mm/memblock.c | |
| parent | 94777fc51b3ad85ff9f705ddf7cdd0eb3bbad5a6 (diff) | |
| download | lwn-6ede1fd3cb404c0016de6ac529df46d561bd558b.tar.gz lwn-6ede1fd3cb404c0016de6ac529df46d561bd558b.zip | |
x86, mm: Trim memory in memblock to be page aligned
We will not map partial pages, so need to make sure memblock
allocation will not allocate those bytes out.
Also we will use for_each_mem_pfn_range() to loop to map memory
range to keep them consistent.
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Link: http://lkml.kernel.org/r/CAE9FiQVZirvaBMFYRfXMmWEcHbKSicQEHz4VAwUv0xFCk51ZNw@mail.gmail.com
Acked-by: Jacob Shin <jacob.shin@amd.com>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Cc: <stable@vger.kernel.org>
Diffstat (limited to 'mm/memblock.c')
| -rw-r--r-- | mm/memblock.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/mm/memblock.c b/mm/memblock.c index 931eef145af5..625905523c2a 100644 --- a/mm/memblock.c +++ b/mm/memblock.c @@ -930,6 +930,30 @@ int __init_memblock memblock_is_region_reserved(phys_addr_t base, phys_addr_t si return memblock_overlaps_region(&memblock.reserved, base, size) >= 0; } +void __init_memblock memblock_trim_memory(phys_addr_t align) +{ + int i; + phys_addr_t start, end, orig_start, orig_end; + struct memblock_type *mem = &memblock.memory; + + for (i = 0; i < mem->cnt; i++) { + orig_start = mem->regions[i].base; + orig_end = mem->regions[i].base + mem->regions[i].size; + start = round_up(orig_start, align); + end = round_down(orig_end, align); + + if (start == orig_start && end == orig_end) + continue; + + if (start < end) { + mem->regions[i].base = start; + mem->regions[i].size = end - start; + } else { + memblock_remove_region(mem, i); + i--; + } + } +} void __init_memblock memblock_set_current_limit(phys_addr_t limit) { |