• Peter Zijlstra's avatar
    lockdep: Fix lock_chain::base size · 75dd602a
    Peter Zijlstra authored
    lock_chain::base is used to store an index into the chain_hlocks[]
    array, however that array contains more elements than can be indexed
    using the u16.
    
    Change the lock_chain structure to use a bitfield to encode the data
    it needs and add BUILD_BUG_ON() assertions to check the fields are
    wide enough.
    
    Also, for DEBUG_LOCKDEP, assert that we don't run out of elements of
    that array; as that would wreck the collision detectoring.
    Signed-off-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
    Cc: Alfredo Alvarez Fernandez <alfredoalvarezfernandez@gmail.com>
    Cc: Andrew Morton <akpm@linux-foundation.org>
    Cc: Linus Torvalds <torvalds@linux-foundation.org>
    Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Cc: Sedat Dilek <sedat.dilek@gmail.com>
    Cc: Theodore Ts'o <tytso@mit.edu>
    Cc: Thomas Gleixner <tglx@linutronix.de>
    Link: http://lkml.kernel.org/r/20160330093659.GS3408@twins.programming.kicks-ass.netSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
    75dd602a
lockdep_proc.c 17.4 KB