]> git.karo-electronics.de Git - karo-tx-linux.git/commit
lockdep: Fix lock_chain::base size
authorPeter Zijlstra <peterz@infradead.org>
Wed, 30 Mar 2016 09:36:59 +0000 (11:36 +0200)
committerIngo Molnar <mingo@kernel.org>
Sat, 23 Apr 2016 11:53:03 +0000 (13:53 +0200)
commit75dd602a5198a6e5f75534db52b6e6fbaabb33d1
treec7ea5657c955e30f93c11127f954343519161252
parentc24697566298df04cac9913e0601501b5ee2b3f5
lockdep: Fix lock_chain::base size

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: Peter 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.net
Signed-off-by: Ingo Molnar <mingo@kernel.org>
include/linux/lockdep.h
kernel/locking/lockdep.c
kernel/locking/lockdep_proc.c