rcutorture: Use monotonic timestamp for stall detection

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The get_seconds() call is deprecated because it overflows on 32-bit
architectures. The algorithm in rcu_torture_stall() can deal with
the overflow, but another problem here is that using a CLOCK_REALTIME
stamp can lead to a false-positive stall warning when a settimeofday()
happens concurrently.

Using ktime_get_seconds() instead avoids those issues and will never
overflow. The added cast to 'unsigned long' however is necessary to
make ULONG_CMP_LT() work correctly.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>

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Arnd Bergmann 2018-06-18 16:47:34 +02:00 • committed by Paul E. McKenney

parent 3b745c8969

commit 622be33fcb

1 changed files with 3 additions and 2 deletions

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kernel/rcu/rcutorture.c

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