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authorSrivatsa Vaddagiri <vatsa@in.ibm.com>2005-12-12 00:37:07 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2005-12-12 08:57:42 -0800
commitc3f5902325d3053986e7359f706581d8f032e72f (patch)
tree1d56b7626b83556982eafad69c597b180c2ef62b /fs
parent89d46b8778f65223f732d82c0166e0abba20fb1e (diff)
[PATCH] Fix RCU race in access of nohz_cpu_mask
Accessing nohz_cpu_mask before incrementing rcp->cur is racy. It can cause tickless idle CPUs to be included in rsp->cpumask, which will extend graceperiods unnecessarily. Fix this race. It has been tested using extensions to RCU torture module that forces various CPUs to become idle. Signed-off-by: Srivatsa Vaddagiri <vatsa@in.ibm.com> Cc: Dipankar Sarma <dipankar@in.ibm.com> Cc: "Paul E. McKenney" <paulmck@us.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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