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authorYisheng Xie <xieyisheng1@huawei.com>2018-02-01 01:16:15 +0100
committerLinus Torvalds <torvalds@linux-foundation.org>2018-02-01 02:18:36 +0100
commit0486a38bcc4749808edbc848f1bcf232042770fc (patch)
tree086609c0e0916a43469e57d4ae6f2ba51ce34c06 /mm/zbud.c
parentmm/mempolicy: fix the check of nodemask from user (diff)
downloadlinux-0486a38bcc4749808edbc848f1bcf232042770fc.tar.xz
linux-0486a38bcc4749808edbc848f1bcf232042770fc.zip
mm/mempolicy: add nodes_empty check in SYSC_migrate_pages
As in manpage of migrate_pages, the errno should be set to EINVAL when none of the node IDs specified by new_nodes are on-line and allowed by the process's current cpuset context, or none of the specified nodes contain memory. However, when test by following case: new_nodes = 0; old_nodes = 0xf; ret = migrate_pages(pid, old_nodes, new_nodes, MAX); The ret will be 0 and no errno is set. As the new_nodes is empty, we should expect EINVAL as documented. To fix the case like above, this patch check whether target nodes AND current task_nodes is empty, and then check whether AND node_states[N_MEMORY] is empty. Link: http://lkml.kernel.org/r/1510882624-44342-4-git-send-email-xieyisheng1@huawei.com Signed-off-by: Yisheng Xie <xieyisheng1@huawei.com> Acked-by: Vlastimil Babka <vbabka@suse.cz> Cc: Andi Kleen <ak@linux.intel.com> Cc: Chris Salls <salls@cs.ucsb.edu> Cc: Christopher Lameter <cl@linux.com> Cc: David Rientjes <rientjes@google.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> Cc: Tan Xiaojun <tanxiaojun@huawei.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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