Hi Marcin, [auto build test WARNING on next-20151016 -- if it's inappropriate base, please suggest rules for selecting the more suitable base] url: https://github.com/0day-ci/linux/commits/Paul-Osmialowski/Additional-kmsg-devices/20151019-211509 reproduce: # apt-get install sparse make ARCH=x86_64 allmodconfig make C=1 CF=-D__CHECK_ENDIAN__ sparse warnings: (new ones prefixed by >>) >> include/linux/rcupdate.h:915:9: sparse: context imbalance in 'kmsg_read' - unexpected unlock vim +/kmsg_read +915 include/linux/rcupdate.h f27bc4873 Paul E. McKenney 2014-05-04 899 * that that preemption never happens within any RCU read-side critical f27bc4873 Paul E. McKenney 2014-05-04 900 * section whose outermost rcu_read_unlock() is called with irqs disabled. f27bc4873 Paul E. McKenney 2014-05-04 901 * This approach relies on the fact that rt_mutex_unlock() currently only f27bc4873 Paul E. McKenney 2014-05-04 902 * acquires irq-disabled locks. f27bc4873 Paul E. McKenney 2014-05-04 903 * f27bc4873 Paul E. McKenney 2014-05-04 904 * The second of these two approaches is best in most situations, f27bc4873 Paul E. McKenney 2014-05-04 905 * however, the first approach can also be useful, at least to those f27bc4873 Paul E. McKenney 2014-05-04 906 * developers willing to keep abreast of the set of locks acquired by f27bc4873 Paul E. McKenney 2014-05-04 907 * rt_mutex_unlock(). f27bc4873 Paul E. McKenney 2014-05-04 908 * 3d76c0829 Paul E. McKenney 2009-09-28 909 * See rcu_read_lock() for more information. 3d76c0829 Paul E. McKenney 2009-09-28 910 */ bc33f24bd Paul E. McKenney 2009-08-22 911 static inline void rcu_read_unlock(void) bc33f24bd Paul E. McKenney 2009-08-22 912 { f78f5b90c Paul E. McKenney 2015-06-18 913 RCU_LOCKDEP_WARN(!rcu_is_watching(), bde23c689 Heiko Carstens 2012-02-01 914 "rcu_read_unlock() used illegally while idle"); bc33f24bd Paul E. McKenney 2009-08-22 @915 __release(RCU); bc33f24bd Paul E. McKenney 2009-08-22 916 __rcu_read_unlock(); d24209bb6 Paul E. McKenney 2015-01-21 917 rcu_lock_release(&rcu_lock_map); /* Keep acq info for rls diags. */ bc33f24bd Paul E. McKenney 2009-08-22 918 } ^1da177e4 Linus Torvalds 2005-04-16 919 ^1da177e4 Linus Torvalds 2005-04-16 920 /** ca5ecddfa Paul E. McKenney 2010-04-28 921 * rcu_read_lock_bh() - mark the beginning of an RCU-bh critical section ^1da177e4 Linus Torvalds 2005-04-16 922 * ^1da177e4 Linus Torvalds 2005-04-16 923 * This is equivalent of rcu_read_lock(), but to be used when updates :::::: The code at line 915 was first introduced by commit :::::: bc33f24bdca8b6e97376e3a182ab69e6cdefa989 rcu: Consolidate sparse and lockdep declarations in include/linux/rcupdate.h :::::: TO: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx> :::::: CC: Ingo Molnar <mingo@xxxxxxx> --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation -- To unsubscribe from this list: send the line "unsubscribe linux-api" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
