Messages in this thread Patch in this message | | | Date | Tue, 17 Nov 2009 16:19:30 -0800 (PST) | From | David Rientjes <> | Subject | [patch -mm] mm: slab allocate memory section nodemask for large systems |
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Nodemasks should not be allocated on the stack for large systems (when it is larger than 256 bytes) since there is a threat of overflow.
This patch causes the unregister_mem_sect_under_nodes() nodemask to be allocated on the stack for smaller systems and be allocated by slab for larger systems.
GFP_KERNEL is used since remove_memory_block() can block.
Cc: Gary Hade <garyhade@us.ibm.com> Cc: Badari Pulavarty <pbadari@us.ibm.com> Cc: Alex Chiang <achiang@hp.com> Signed-off-by: David Rientjes <rientjes@google.com> --- drivers/base/node.c | 13 +++++++++---- 1 files changed, 9 insertions(+), 4 deletions(-)
diff --git a/drivers/base/node.c b/drivers/base/node.c --- a/drivers/base/node.c +++ b/drivers/base/node.c @@ -363,12 +363,16 @@ int register_mem_sect_under_node(struct memory_block *mem_blk, int nid) /* unregister memory section under all nodes that it spans */ int unregister_mem_sect_under_nodes(struct memory_block *mem_blk) { - nodemask_t unlinked_nodes; + NODEMASK_ALLOC(nodemask_t, unlinked_nodes, GFP_KERNEL); unsigned long pfn, sect_start_pfn, sect_end_pfn; - if (!mem_blk) + if (!mem_blk) { + NODEMASK_FREE(unlinked_nodes); return -EFAULT; - nodes_clear(unlinked_nodes); + } + if (!unlinked_nodes) + return -ENOMEM; + nodes_clear(*unlinked_nodes); sect_start_pfn = section_nr_to_pfn(mem_blk->phys_index); sect_end_pfn = sect_start_pfn + PAGES_PER_SECTION - 1; for (pfn = sect_start_pfn; pfn <= sect_end_pfn; pfn++) { @@ -379,13 +383,14 @@ int unregister_mem_sect_under_nodes(struct memory_block *mem_blk) continue; if (!node_online(nid)) continue; - if (node_test_and_set(nid, unlinked_nodes)) + if (node_test_and_set(nid, *unlinked_nodes)) continue; sysfs_remove_link(&node_devices[nid].sysdev.kobj, kobject_name(&mem_blk->sysdev.kobj)); sysfs_remove_link(&mem_blk->sysdev.kobj, kobject_name(&node_devices[nid].sysdev.kobj)); } + NODEMASK_FREE(unlinked_nodes); return 0; }
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