• Byungchul Park's avatar
    locking/lockdep: Implement the 'crossrelease' feature · b09be676
    Byungchul Park authored
    Lockdep is a runtime locking correctness validator that detects and
    reports a deadlock or its possibility by checking dependencies between
    locks. It's useful since it does not report just an actual deadlock but
    also the possibility of a deadlock that has not actually happened yet.
    That enables problems to be fixed before they affect real systems.
    However, this facility is only applicable to typical locks, such as
    spinlocks and mutexes, which are normally released within the context in
    which they were acquired. However, synchronization primitives like page
    locks or completions, which are allowed to be released in any context,
    also create dependencies and can cause a deadlock.
    So lockdep should track these locks to do a better job. The 'crossrelease'
    implementation makes these primitives also be tracked.
    Signed-off-by: default avatarByungchul Park <byungchul.park@lge.com>
    Signed-off-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
    Cc: Linus Torvalds <torvalds@linux-foundation.org>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Cc: Thomas Gleixner <tglx@linutronix.de>
    Cc: akpm@linux-foundation.org
    Cc: boqun.feng@gmail.com
    Cc: kernel-team@lge.com
    Cc: kirill@shutemov.name
    Cc: npiggin@gmail.com
    Cc: walken@google.com
    Cc: willy@infradead.org
    Link: http://lkml.kernel.org/r/1502089981-21272-6-git-send-email-byungchul.park@lge.com
    Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
workqueue.c 156 KB