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| author | WANG Cong <xiyou.wangcong@gmail.com> | 2007-12-17 16:19:59 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-12-17 19:28:16 -0800 |
| commit | bbd0682596f7a434467ee551fee18d5f0b818539 (patch) | |
| tree | 3afd7cbb301125fc21799a5fd9a70c2b5d700f17 /mm | |
| parent | af0cd5a7c3cded50c25e98acd94912d17a0eb914 (diff) | |
| download | lwn-bbd0682596f7a434467ee551fee18d5f0b818539.tar.gz lwn-bbd0682596f7a434467ee551fee18d5f0b818539.zip | |
mm/sparse.c: improve the error handling for sparse_add_one_section()
Improve the error handling for mm/sparse.c::sparse_add_one_section(). And I
see no reason to check 'usemap' until holding the 'pgdat_resize_lock'.
[geoffrey.levand@am.sony.com: sparse_index_init() returns -EEXIST]
Cc: Christoph Lameter <clameter@sgi.com>
Acked-by: Dave Hansen <haveblue@us.ibm.com>
Cc: Rik van Riel <riel@redhat.com>
Acked-by: Yasunori Goto <y-goto@jp.fujitsu.com>
Cc: Andy Whitcroft <apw@shadowen.org>
Signed-off-by: WANG Cong <xiyou.wangcong@gmail.com>
Signed-off-by: Geoff Levand <geoffrey.levand@am.sony.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/sparse.c | 18 |
1 files changed, 12 insertions, 6 deletions
diff --git a/mm/sparse.c b/mm/sparse.c index d245e59048a8..a2183cb5d524 100644 --- a/mm/sparse.c +++ b/mm/sparse.c @@ -391,9 +391,17 @@ int sparse_add_one_section(struct zone *zone, unsigned long start_pfn, * no locking for this, because it does its own * plus, it does a kmalloc */ - sparse_index_init(section_nr, pgdat->node_id); + ret = sparse_index_init(section_nr, pgdat->node_id); + if (ret < 0 && ret != -EEXIST) + return ret; memmap = kmalloc_section_memmap(section_nr, pgdat->node_id, nr_pages); + if (!memmap) + return -ENOMEM; usemap = __kmalloc_section_usemap(); + if (!usemap) { + __kfree_section_memmap(memmap, nr_pages); + return -ENOMEM; + } pgdat_resize_lock(pgdat, &flags); @@ -403,18 +411,16 @@ int sparse_add_one_section(struct zone *zone, unsigned long start_pfn, goto out; } - if (!usemap) { - ret = -ENOMEM; - goto out; - } ms->section_mem_map |= SECTION_MARKED_PRESENT; ret = sparse_init_one_section(ms, section_nr, memmap, usemap); out: pgdat_resize_unlock(pgdat, &flags); - if (ret <= 0) + if (ret <= 0) { + kfree(usemap); __kfree_section_memmap(memmap, nr_pages); + } return ret; } #endif |