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author | Dan Williams <dan.j.williams@intel.com> | 2022-04-21 08:33:13 -0700 |
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committer | Dan Williams <dan.j.williams@intel.com> | 2022-04-28 14:01:54 -0700 |
commit | 3750d013182b071dbf458144540390de0031be8c (patch) | |
tree | 1c6f6b29a4bd2f1ae1dc6fb522b5c92a56db9b4a /drivers/cxl/cxl.h | |
parent | 56368029d93bbb3246ee2e03268fa6dd9754be05 (diff) | |
download | linux-3750d013182b071dbf458144540390de0031be8c.tar.gz linux-3750d013182b071dbf458144540390de0031be8c.tar.bz2 linux-3750d013182b071dbf458144540390de0031be8c.zip |
cxl: Replace lockdep_mutex with local lock classes
In response to an attempt to expand dev->lockdep_mutex for device_lock()
validation [1], Peter points out [2] that the lockdep API already has
the ability to assign a dedicated lock class per subsystem device-type.
Use lockdep_set_class() to override the default device_lock()
'__lockdep_no_validate__' class for each CXL subsystem device-type. This
enables lockdep to detect deadlocks and recursive locking within the
device-driver core and the subsystem. The
lockdep_set_class_and_subclass() API is used for port objects that
recursively lock the 'cxl_port_key' class by hierarchical topology
depth.
Link: https://lore.kernel.org/r/164982968798.684294.15817853329823976469.stgit@dwillia2-desk3.amr.corp.intel.com [1]
Link: https://lore.kernel.org/r/Ylf0dewci8myLvoW@hirez.programming.kicks-ass.net [2]
Suggested-by: Peter Zijlstra <peterz@infradead.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Will Deacon <will@kernel.org>
Cc: Waiman Long <longman@redhat.com>
Cc: Boqun Feng <boqun.feng@gmail.com>
Cc: Alison Schofield <alison.schofield@intel.com>
Cc: Vishal Verma <vishal.l.verma@intel.com>
Cc: Ira Weiny <ira.weiny@intel.com>
Cc: Ben Widawsky <ben.widawsky@intel.com>
Cc: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Link: https://lore.kernel.org/r/165055519317.3745911.7342499516839702840.stgit@dwillia2-desk3.amr.corp.intel.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/cxl/cxl.h')
0 files changed, 0 insertions, 0 deletions