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'. If someone knows, please let me know.
Note! This patch is _not_ tested yet, since it seems that I can't
configure sparse memory for i386 box. Sorry for this. ;(
I hope someone can help me to test it.
Cc: Christoph Lameter <[email protected]>
Cc: Dave Hansen <[email protected]>
Cc: Rik van Riel <[email protected]>
Signed-off-by: WANG Cong <[email protected]>
---
mm/sparse.c | 17 ++++++++++-------
1 file changed, 10 insertions(+), 7 deletions(-)
Index: linux-2.6/mm/sparse.c
===================================================================
--- linux-2.6.orig/mm/sparse.c
+++ linux-2.6/mm/sparse.c
@@ -391,9 +391,17 @@ int sparse_add_one_section(struct zone *
* 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)
+ 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 +411,13 @@ int sparse_add_one_section(struct zone *
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)
- __kfree_section_memmap(memmap, nr_pages);
+
return ret;
}
#endif
-
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