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rcu: Make call_rcu_tasks() tolerate first call with irqs disabled

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Currently, if the very first call to call_rcu_tasks() has irqs disabled,
it will create the rcu_tasks_kthread with irqs disabled, which will
result in a splat in the memory allocator, which kthread_run() invokes
with the expectation that irqs are enabled.

This commit fixes this problem by deferring kthread creation if called
with irqs disabled.  The first call to call_rcu_tasks() that has irqs
enabled will create the kthread.

This bug was detected by rcutorture changes that were motivated by
Iftekhar Ahmed's mutation-testing efforts.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
This commit is contained in:
Paul E. McKenney 2016-05-02 11:58:56 -07:00
parent 570dd3c742
commit 4929c913bd
2 changed files with 6 additions and 2 deletions
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1
include/linux/rcupdate.h
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@ -45,6 +45,7 @@
#include <linux/bug.h>
#include <linux/compiler.h>
#include <linux/ktime.h>
#include <linux/irqflags.h>
#include <asm/barrier.h>