The patch titled
RCU: add comments to rcu_pending/rcu_needs_cpu
has been added to the -mm tree. Its filename is
rcu-introduce-rcu_needs_cpu-interface-fix.patch
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
From: Heiko Carstens <heiko.carstens@xxxxxxxxxx>
Add some comments to rcu_pending() and rcu_needs_cpu().
Signed-off-by: Heiko Carstens <heiko.carstens@xxxxxxxxxx>
Cc: "Paul E. McKenney" <paulmck@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
kernel/rcupdate.c | 18 ++++++++++++++++++
1 files changed, 18 insertions(+)
diff -puN kernel/rcupdate.c~rcu-introduce-rcu_needs_cpu-interface-fix kernel/rcupdate.c
--- 25/kernel/rcupdate.c~rcu-introduce-rcu_needs_cpu-interface-fix Thu Apr 27 15:24:54 2006
+++ 25-akpm/kernel/rcupdate.c Thu Apr 27 15:24:54 2006
@@ -479,12 +479,30 @@ static int __rcu_pending(struct rcu_ctrl
return 0;
}
+/**
+ * rcu_pending - Check for pending RCU work on cpu.
+ * @cpu: cpu to check.
+ *
+ * Does RCU have some work pending on the specified cpu, so that there is a
+ * need to invoke rcu_check_callbacks() on the cpu?
+ */
int rcu_pending(int cpu)
{
return __rcu_pending(&rcu_ctrlblk, &per_cpu(rcu_data, cpu)) ||
__rcu_pending(&rcu_bh_ctrlblk, &per_cpu(rcu_bh_data, cpu));
}
+/**
+ * rcu_needs_cpu - Determine if cpu will still be needed by RCU.
+ * @cpu: cpu to check.
+ *
+ * Determine whether the specified cpu will still be needed by RCU, or whether
+ * it can be turned off (e.g. by entering a tickless idle state).
+ * Note the difference to rcu_pending() which checks if there is some work to
+ * do that can be done immediately. While this function in addition checks if
+ * there would be some work to do if e.g. a different cpu finished working on
+ * the current batch.
+ */
int rcu_needs_cpu(int cpu)
{
struct rcu_data *rdp = &per_cpu(rcu_data, cpu);
_
Patches currently in -mm which might be from heiko.carstens@xxxxxxxxxx are
s390-make-qeth-buildable.patch
s390-bug-in-setup_rt_frame.patch
s390-instruction-processing-damage-handling.patch
rcu-introduce-rcu_needs_cpu-interface.patch
rcu-introduce-rcu_needs_cpu-interface-fix.patch
s390-exploit-rcu_needs_cpu-interface.patch
ipv4-inet_init-fs_initcall.patch
-
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