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From: Paul E. McKenney on 4 May 2010 16:40
The mce processing applies rcu_dereference_check() to integers used as
array indices. This patch therefore moves mce to the new RCU API
rcu_dereference_index_check() that avoids the sparse processing that
would otherwise result in compiler errors.

Signed-off-by: Paul E. McKenney <paulmck(a)linux.vnet.ibm.com>
Cc: Andi Kleen <andi(a)firstfloor.org>
Cc: Thomas Gleixner <tglx(a)linutronix.de>
Cc: Ingo Molnar <mingo(a)redhat.com>
Cc: "H. Peter Anvin" <hpa(a)zytor.com>
---
arch/x86/kernel/cpu/mcheck/mce.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/arch/x86/kernel/cpu/mcheck/mce.c b/arch/x86/kernel/cpu/mcheck/mce.c
index 8a6f0af..f00a9f2 100644
--- a/arch/x86/kernel/cpu/mcheck/mce.c
+++ b/arch/x86/kernel/cpu/mcheck/mce.c
@@ -50,7 +50,7 @@
static DEFINE_MUTEX(mce_read_mutex);

#define rcu_dereference_check_mce(p) \
- rcu_dereference_check((p), \
+ rcu_dereference_index_check((p), \
rcu_read_lock_sched_held() || \
lockdep_is_held(&mce_read_mutex))

--
1.7.0

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Prev: [PATCH tip/core/rcu 08/48] rcu: shrink rcutiny by making synchronize_rcu_bh() be inline
Next: [PATCH tip/core/rcu 03/48] rcu: make dead code really dead