<html> <head> <base href="https://bugs.freedesktop.org/"> </head> <body> <div> <a class="bz_bug_link bz_status_REOPENED " title="REOPENED - [CI][SHARDS] igt@perf_pmu@busy-idle-no-semaphores-bcs0 - dmesg-warn - WARNING: possible irq lock inversion dependency detected" href="https://bugs.freedesktop.org/show_bug.cgi?id=111626#c23">Comment # 23</a> on <a class="bz_bug_link bz_status_REOPENED " title="REOPENED - [CI][SHARDS] igt@perf_pmu@busy-idle-no-semaphores-bcs0 - dmesg-warn - WARNING: possible irq lock inversion dependency detected" href="https://bugs.freedesktop.org/show_bug.cgi?id=111626">bug 111626</a> from <a class="email" href="mailto:chris@chris-wilson.co.uk" title="Chris Wilson <chris@chris-wilson.co.uk>"> Chris Wilson</a> <pre>Sigh, The following commit has been merged into the locking/core branch of tip: Commit-ID: a0855d24fc22d49cdc25664fb224caee16998683 Gitweb: <a href="https://git.kernel.org/tip/a0855d24fc22d49cdc25664fb224caee16998683">https://git.kernel.org/tip/a0855d24fc22d49cdc25664fb224caee16998683</a> Author: Davidlohr Bueso <<a href="mailto:dave@stgolabs.net">dave@stgolabs.net</a>> AuthorDate: Thu, 24 Oct 2019 20:36:34 -07:00 Committer: Ingo Molnar <<a href="mailto:mingo@kernel.org">mingo@kernel.org</a>> CommitterDate: Tue, 29 Oct 2019 12:22:52 +01:00 locking/mutex: Complain upon mutex API misuse in IRQ contexts Add warning checks if mutex_trylock() or mutex_unlock() are used in IRQ contexts, under CONFIG_DEBUG_MUTEXES=y. While the mutex rules and semantics are explicitly documented, this allows to expose any abusers and robustifies the whole thing. While trylock and unlock are non-blocking, calling from IRQ context is still forbidden (lock must be within the same context as unlock). Signed-off-by: Davidlohr Bueso <<a href="mailto:dbueso@suse.de">dbueso@suse.de</a>> Signed-off-by: Peter Zijlstra (Intel) <<a href="mailto:peterz@infradead.org">peterz@infradead.org</a>> Cc: Linus Torvalds <<a href="mailto:torvalds@linux-foundation.org">torvalds@linux-foundation.org</a>> Cc: Peter Zijlstra <<a href="mailto:peterz@infradead.org">peterz@infradead.org</a>> Cc: Thomas Gleixner <<a href="mailto:tglx@linutronix.de">tglx@linutronix.de</a>> Cc: <a href="mailto:dave@stgolabs.net">dave@stgolabs.net</a> Link: <a href="https://lkml.kernel.org/r/20191025033634.3330-1-dave@stgolabs.net">https://lkml.kernel.org/r/20191025033634.3330-1-dave@stgolabs.net</a> Signed-off-by: Ingo Molnar <<a href="mailto:mingo@kernel.org">mingo@kernel.org</a>> next kernel this warning will get louder.</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the QA Contact for the bug.</li> <li>You are on the CC list for the bug.</li> <li>You are the assignee for the bug.</li> </ul> </body> </html>