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Commit 6b80da42 authored by Paul E. McKenney's avatar Paul E. McKenney
Browse files

rcutorture: Use unsigned for Reader Batch computations 



The counter returned by the various ->completed functions is subject to
overflow, which means that subtracting two such counters might result
in overflow, which invokes undefined behavior in the C standard.  This
commit therefore changes these functions and variables to unsigned to
avoid this undefined behavior.

Signed-off-by: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
parent 3b009c0e

kernel/rcu/rcutorture.c

+9 −9
Original line number Diff line number Diff line
@@ -244,7 +244,7 @@ struct rcu_torture_ops { 
	int (*readlock)(void);

	void (*read_delay)(struct torture_random_state *rrsp);

	void (*readunlock)(int idx);

	int (*completed)(void);

	unsigned long (*completed)(void);

	void (*deferred_free)(struct rcu_torture *p);

	void (*sync)(void);

	void (*exp_sync)(void);
@@ -296,7 +296,7 @@ static void rcu_torture_read_unlock(int idx) __releases(RCU) 
	rcu_read_unlock();

}



static int rcu_torture_completed(void)

static unsigned long rcu_torture_completed(void)

{

	return rcu_batches_completed();

}
@@ -356,7 +356,7 @@ rcu_torture_cb(struct rcu_head *p) 
		cur_ops->deferred_free(rp);

}



static int rcu_no_completed(void)

static unsigned long rcu_no_completed(void)

{

	return 0;

}
@@ -407,7 +407,7 @@ static void rcu_bh_torture_read_unlock(int idx) __releases(RCU_BH) 
	rcu_read_unlock_bh();

}



static int rcu_bh_torture_completed(void)

static unsigned long rcu_bh_torture_completed(void)

{

	return rcu_batches_completed_bh();

}
@@ -510,7 +510,7 @@ static void srcu_torture_read_unlock(int idx) __releases(&srcu_ctl) 
	srcu_read_unlock(&srcu_ctl, idx);

}



static int srcu_torture_completed(void)

static unsigned long srcu_torture_completed(void)

{

	return srcu_batches_completed(&srcu_ctl);

}
@@ -1015,8 +1015,8 @@ static void rcutorture_trace_dump(void) 
static void rcu_torture_timer(unsigned long unused)

{

	int idx;

	int completed;

	int completed_end;

	unsigned long completed;

	unsigned long completed_end;

	static DEFINE_TORTURE_RANDOM(rand);

	static DEFINE_SPINLOCK(rand_lock);

	struct rcu_torture *p;
@@ -1073,8 +1073,8 @@ static void rcu_torture_timer(unsigned long unused) 
static int

rcu_torture_reader(void *arg)

{

	int completed;

	int completed_end;

	unsigned long completed;

	unsigned long completed_end;

	int idx;

	DEFINE_TORTURE_RANDOM(rand);

	struct rcu_torture *p;