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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>
This commit is contained in:
WANG Cong 2007-12-17 16:19:59 -08:00 committed by Linus Torvalds
parent af0cd5a7c3
commit bbd0682596
1 changed files with 12 additions and 6 deletions
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18
mm/sparse.c
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@ -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