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authorBart Van Assche <bvanassche@acm.org>2014-08-08 12:35:36 +0200
committerIngo Molnar <mingo@kernel.org>2014-08-13 10:32:38 +0200
commit4999201a59ef555f9105d2bb2459ed895627f7aa (patch)
tree51148e7d68b8dd47f50344020b489aa20cb459e0 /include/linux/lockdep.h
parentlocking/Documentation: Update locking/mutex-design.txt disadvantages (diff)
downloadlinux-dev-4999201a59ef555f9105d2bb2459ed895627f7aa.tar.xz
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locking/spinlocks: Always evaluate the second argument of spin_lock_nested()
Evaluating a macro argument only if certain configuration options have been selected is confusing and error-prone. Hence always evaluate the second argument of spin_lock_nested(). An intentional side effect of this patch is that it avoids that the following warning is reported for netif_addr_lock_nested() when building with CONFIG_DEBUG_LOCK_ALLOC=n and with W=1: include/linux/netdevice.h: In function 'netif_addr_lock_nested': include/linux/netdevice.h:2865:6: warning: variable 'subclass' set but not used [-Wunused-but-set-variable] int subclass = SINGLE_DEPTH_NESTING; ^ Signed-off-by: Bart Van Assche <bvanassche@acm.org> Signed-off-by: Peter Zijlstra <peterz@infradead.org> Cc: David Rientjes <rientjes@google.com> Cc: David S. Miller <davem@davemloft.net> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Link: http://lkml.kernel.org/r/53E4A7F8.1040700@acm.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
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