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srcutiny: Mark read-side data races

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This commit marks some interrupt-induced read-side data races in
__srcu_read_lock(), __srcu_read_unlock(), and srcu_torture_stats_print().

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
Paul E. McKenney 2021-06-02 16:31:38 -07:00
parent b169246feb
commit 65bfdd36c1
2 changed files with 5 additions and 5 deletions
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8
include/linux/srcutiny.h
View File

@ -61,7 +61,7 @@ static inline int __srcu_read_lock(struct srcu_struct *ssp)
int idx;
idx = ((READ_ONCE(ssp->srcu_idx) + 1) & 0x2) >> 1;
WRITE_ONCE(ssp->srcu_lock_nesting[idx], ssp->srcu_lock_nesting[idx] + 1);
WRITE_ONCE(ssp->srcu_lock_nesting[idx], READ_ONCE(ssp->srcu_lock_nesting[idx]) + 1);
return idx;
}
@ -81,11 +81,11 @@ static inline void srcu_torture_stats_print(struct srcu_struct *ssp,
{
int idx;
idx = ((READ_ONCE(ssp->srcu_idx) + 1) & 0x2) >> 1;
idx = ((data_race(READ_ONCE(ssp->srcu_idx)) + 1) & 0x2) >> 1;
pr_alert("%s%s Tiny SRCU per-CPU(idx=%d): (%hd,%hd)\n",
tt, tf, idx,
READ_ONCE(ssp->srcu_lock_nesting[!idx]),
READ_ONCE(ssp->srcu_lock_nesting[idx]));
data_race(READ_ONCE(ssp->srcu_lock_nesting[!idx])),
data_race(READ_ONCE(ssp->srcu_lock_nesting[idx])));
}
#endif

2
kernel/rcu/srcutiny.c
View File

@ -96,7 +96,7 @@ EXPORT_SYMBOL_GPL(cleanup_srcu_struct);
*/
void __srcu_read_unlock(struct srcu_struct *ssp, int idx)
{
int newval = ssp->srcu_lock_nesting[idx] - 1;
int newval = READ_ONCE(ssp->srcu_lock_nesting[idx]) - 1;
WRITE_ONCE(ssp->srcu_lock_nesting[idx], newval);
if (!newval && READ_ONCE(ssp->srcu_gp_waiting))