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Commit | Line | Data |
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8c71e98e GKH |
1 | From 6ede1fd3cb404c0016de6ac529df46d561bd558b Mon Sep 17 00:00:00 2001 |
2 | From: Yinghai Lu <yinghai@kernel.org> | |
3 | Date: Mon, 22 Oct 2012 16:35:18 -0700 | |
4 | Subject: x86, mm: Trim memory in memblock to be page aligned | |
5 | ||
6 | From: Yinghai Lu <yinghai@kernel.org> | |
7 | ||
8 | commit 6ede1fd3cb404c0016de6ac529df46d561bd558b upstream. | |
9 | ||
10 | We will not map partial pages, so need to make sure memblock | |
11 | allocation will not allocate those bytes out. | |
12 | ||
13 | Also we will use for_each_mem_pfn_range() to loop to map memory | |
14 | range to keep them consistent. | |
15 | ||
16 | Signed-off-by: Yinghai Lu <yinghai@kernel.org> | |
17 | Link: http://lkml.kernel.org/r/CAE9FiQVZirvaBMFYRfXMmWEcHbKSicQEHz4VAwUv0xFCk51ZNw@mail.gmail.com | |
18 | Acked-by: Jacob Shin <jacob.shin@amd.com> | |
19 | Signed-off-by: H. Peter Anvin <hpa@linux.intel.com> | |
20 | Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> | |
21 | ||
22 | --- | |
23 | arch/x86/kernel/e820.c | 3 +++ | |
24 | include/linux/memblock.h | 1 + | |
25 | mm/memblock.c | 24 ++++++++++++++++++++++++ | |
26 | 3 files changed, 28 insertions(+) | |
27 | ||
28 | --- a/arch/x86/kernel/e820.c | |
29 | +++ b/arch/x86/kernel/e820.c | |
30 | @@ -1076,6 +1076,9 @@ void __init memblock_x86_fill(void) | |
31 | memblock_add(ei->addr, ei->size); | |
32 | } | |
33 | ||
34 | + /* throw away partial pages */ | |
35 | + memblock_trim_memory(PAGE_SIZE); | |
36 | + | |
37 | memblock_dump_all(); | |
38 | } | |
39 | ||
40 | --- a/include/linux/memblock.h | |
41 | +++ b/include/linux/memblock.h | |
42 | @@ -57,6 +57,7 @@ int memblock_add(phys_addr_t base, phys_ | |
43 | int memblock_remove(phys_addr_t base, phys_addr_t size); | |
44 | int memblock_free(phys_addr_t base, phys_addr_t size); | |
45 | int memblock_reserve(phys_addr_t base, phys_addr_t size); | |
46 | +void memblock_trim_memory(phys_addr_t align); | |
47 | ||
48 | #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP | |
49 | void __next_mem_pfn_range(int *idx, int nid, unsigned long *out_start_pfn, | |
50 | --- a/mm/memblock.c | |
51 | +++ b/mm/memblock.c | |
52 | @@ -908,6 +908,30 @@ int __init_memblock memblock_is_region_r | |
53 | return memblock_overlaps_region(&memblock.reserved, base, size) >= 0; | |
54 | } | |
55 | ||
56 | +void __init_memblock memblock_trim_memory(phys_addr_t align) | |
57 | +{ | |
58 | + int i; | |
59 | + phys_addr_t start, end, orig_start, orig_end; | |
60 | + struct memblock_type *mem = &memblock.memory; | |
61 | + | |
62 | + for (i = 0; i < mem->cnt; i++) { | |
63 | + orig_start = mem->regions[i].base; | |
64 | + orig_end = mem->regions[i].base + mem->regions[i].size; | |
65 | + start = round_up(orig_start, align); | |
66 | + end = round_down(orig_end, align); | |
67 | + | |
68 | + if (start == orig_start && end == orig_end) | |
69 | + continue; | |
70 | + | |
71 | + if (start < end) { | |
72 | + mem->regions[i].base = start; | |
73 | + mem->regions[i].size = end - start; | |
74 | + } else { | |
75 | + memblock_remove_region(mem, i); | |
76 | + i--; | |
77 | + } | |
78 | + } | |
79 | +} | |
80 | ||
81 | void __init_memblock memblock_set_current_limit(phys_addr_t limit) | |
82 | { |