• Paul E. McKenney's avatar
    rcu: define __rcu address space modifier for sparse · ca5ecddf
    Paul E. McKenney authored
    This commit provides definitions for the __rcu annotation defined earlier.
    This annotation permits sparse to check for correct use of RCU-protected
    pointers.  If a pointer that is annotated with __rcu is accessed
    directly (as opposed to via rcu_dereference(), rcu_assign_pointer(),
    or one of their variants), sparse can be made to complain.  To enable
    such complaints, use the new default-disabled CONFIG_SPARSE_RCU_POINTER
    kernel configuration option.  Please note that these sparse complaints are
    intended to be a debugging aid, -not- a code-style-enforcement mechanism.
    
    There are special rcu_dereference_protected() and rcu_access_pointer()
    accessors for use when RCU read-side protection is not required, for
    example, when no other CPU has access to the data structure in question
    or while the current CPU hold the update-side lock.
    
    This patch also updates a number of docbook comments that were showing
    their age.
    Signed-off-by: default avatarArnd Bergmann <arnd@arndb.de>
    Signed-off-by: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
    Cc: Christopher Li <sparse@chrisli.org>
    Reviewed-by: default avatarJosh Triplett <josh@joshtriplett.org>
    ca5ecddf
Kconfig.debug 40.2 KB