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Subject[PATCH] PREEMPT_RT_FULL Build error fix
Date
Problem:
make O=/bld/3.0.3-rt11/ kernel/fork.o
/home/jkacur/jk-2.6/kernel/fork.c:91: error: section of ‘name’ conflicts with previous declaration

__cacheline_aligned is already part of the definition of DEFINE_RWLOCK
for -rt

However it is not always used for the tasklist_lock in non-rt, so it can't
simply be added to the definition of DEFINE_RWLOCK in non-rt, so I modified
the definition in fork.c

Signed-off-by: John Kacur
---
kernel/fork.c | 4 ++++
1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/kernel/fork.c b/kernel/fork.c
index aa5fe26..0d264ec 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -87,7 +87,11 @@ int max_threads; /* tunable limit on nr_threads */

DEFINE_PER_CPU(unsigned long, process_counts) = 0;

+#ifndef CONFIG_PREEMPT_RT_FULL
__cacheline_aligned DEFINE_RWLOCK(tasklist_lock); /* outer */
+#else
+DEFINE_RWLOCK(tasklist_lock); /* outer */
+#endif

#ifdef CONFIG_PROVE_RCU
int lockdep_tasklist_lock_is_held(void)
--
1.7.2.3
--
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