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rcu: Fix harmless omission of "CONFIG_" from #if condition 

The C preprocessor macros SRCU and TINY_RCU should instead be CONFIG_SRCU
and CONFIG_TINY_RCU, respectively in the #f in kernel/rcu/rcu.h. But
there is no harm when "TINY_RCU" is wrongly used, which are always
non-defined, which makes "!defined(TINY_RCU)" always true, which means
the code block is always included, and the included code block doesn't
cause any compilation error so far in CONFIG_TINY_RCU builds.  It is
also the reason this change should not be taken in -stable.

This commit adds the needed "CONFIG_" prefix to both macros.

Not for -stable.

Signed-off-by: Lai Jiangshan <jiangshanlai@gmail.com>
Signed-off-by: Lai Jiangshan <laijs@linux.alibaba.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
Lai Jiangshan 2019-10-15 10:23:56 +00:00 committed by Paul E. McKenney
parent c30fe54189
commit 822175e729
1 changed files with 2 additions and 2 deletions
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4
kernel/rcu/rcu.h
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@ -281,7 +281,7 @@ void rcu_test_sync_prims(void);
*/
extern void resched_cpu(int cpu);
#if defined(SRCU) || !defined(TINY_RCU)
#if defined(CONFIG_SRCU) || !defined(CONFIG_TINY_RCU)
#include <linux/rcu_node_tree.h>
@ -418,7 +418,7 @@ do { \
#define raw_lockdep_assert_held_rcu_node(p) \
lockdep_assert_held(&ACCESS_PRIVATE(p, lock))
#endif /* #if defined(SRCU) || !defined(TINY_RCU) */
#endif /* #if defined(CONFIG_SRCU) || !defined(CONFIG_TINY_RCU) */
#ifdef CONFIG_SRCU
void srcu_init(void);