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authorPaul E. McKenney <paulmck@linux.vnet.ibm.com>2009-09-23 09:50:41 -0700
committerIngo Molnar <mingo@elte.hu>2009-09-23 19:46:29 +0200
commitfc2219d49ef1606e7fd2c88af2b423b01ff3d319 (patch)
tree1c1cba7e4334898a98cf0e2c992e8cfef4b34979 /init
parent0729e196147692d84d4c099fcff056eba2ed61d8 (diff)
downloadlinux-fc2219d49ef1606e7fd2c88af2b423b01ff3d319.tar.bz2
rcu: Clean up code based on review feedback from Josh Triplett
These issues identified during an old-fashioned face-to-face code review extended over many hours. o Bury various forms of the "rsp->completed == rsp->gpnum" comparison into an rcu_gp_in_progress() function, which has the beneficial side-effect of forcing consistent use of ACCESS_ONCE(). o Replace hand-coded arithmetic with DIV_ROUND_UP(). o Bury several "!list_empty(&rnp->blocked_tasks[rnp->gpnum & 0x01])" instances into an rcu_preempted_readers() function, as this expression indicates that there are no readers blocked within RCU read-side critical sections blocking the current grace period. (Though there might well be similar readers blocking the next grace period.) o Remove a dangling rcu_restart_cpu() declaration that has been dangling for almost 20 minor releases of the kernel. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Acked-by: Peter Zijlstra <peterz@infradead.org> Cc: laijs@cn.fujitsu.com Cc: dipankar@in.ibm.com Cc: akpm@linux-foundation.org Cc: mathieu.desnoyers@polymtl.ca Cc: josh@joshtriplett.org Cc: dvhltc@us.ibm.com Cc: niv@us.ibm.com Cc: rostedt@goodmis.org Cc: Valdis.Kletnieks@vt.edu Cc: dhowells@redhat.com LKML-Reference: <12537246442687-git-send-email-> Signed-off-by: Ingo Molnar <mingo@elte.hu>
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