diff options
| author | Dan Williams <[email protected]> | 2017-02-24 14:55:45 -0800 |
|---|---|---|
| committer | Linus Torvalds <[email protected]> | 2017-02-24 17:46:53 -0800 |
| commit | b5d24fda9c3dce51fcb4eee459550a458eaaf1e2 (patch) | |
| tree | aad811ffd2581cd9d29c5995615a8b77cfe2859b /tools/perf/scripts/python/syscall-counts.py | |
| parent | 299c517adb903ddd376dd103fcc9dcfff3d4728b (diff) | |
mm, devm_memremap_pages: hold device_hotplug lock over mem_hotplug_{begin, done}
The mem_hotplug_{begin,done} lock coordinates with {get,put}_online_mems()
to hold off "readers" of the current state of memory from new hotplug
actions. mem_hotplug_begin() expects exclusive access, via the
device_hotplug lock, to set mem_hotplug.active_writer. Calling
mem_hotplug_begin() without locking device_hotplug can lead to
corrupting mem_hotplug.refcount and missed wakeups / soft lockups.
[[email protected]: v2]
Link: http://lkml.kernel.org/r/148728203365.38457.17804568297887708345.stgit@dwillia2-desk3.amr.corp.intel.com
Link: http://lkml.kernel.org/r/148693885680.16345.17802627926777862337.stgit@dwillia2-desk3.amr.corp.intel.com
Fixes: f931ab479dd2 ("mm: fix devm_memremap_pages crash, use mem_hotplug_{begin, done}")
Signed-off-by: Dan Williams <[email protected]>
Reported-by: Ben Hutchings <[email protected]>
Cc: Michal Hocko <[email protected]>
Cc: Toshi Kani <[email protected]>
Cc: Vlastimil Babka <[email protected]>
Cc: Logan Gunthorpe <[email protected]>
Cc: Masayoshi Mizuma <[email protected]>
Cc: <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
Diffstat (limited to 'tools/perf/scripts/python/syscall-counts.py')
0 files changed, 0 insertions, 0 deletions