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Date: Thu, 7 May 2015 13:56:50 +1000
From: Stephen Rothwell <sfr@...b.auug.org.au>
To: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
Peter Zijlstra <peterz@...radead.org>
Cc: linux-next@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: linux-next: manual merge of the rcu tree with the tip tree
Hi Paul,
Today's linux-next merge of the rcu tree got conflicts in
include/linux/rcupdate.h, include/linux/rcutree.h and
kernel/rcu/tree_plugin.h between commit c1ad348b452a ("tick: Nohz:
Rework next timer evaluation") from the tip tree and commit
f49f794683d6 ("rcu: Eliminate a few CONFIG_RCU_NOCB_CPU_ALL #ifdefs")
from the rcu tree.
I fixed it up (see below) and can carry the fix as necessary (no action
is required).
--
Cheers,
Stephen Rothwell sfr@...b.auug.org.au
diff --cc include/linux/rcupdate.h
index 0627a447c589,03a899aabd17..000000000000
--- a/include/linux/rcupdate.h
+++ b/include/linux/rcupdate.h
@@@ -1155,13 -1099,13 +1101,13 @@@ static inline notrace void rcu_read_unl
#define kfree_rcu(ptr, rcu_head) \
__kfree_rcu(&((ptr)->rcu_head), offsetof(typeof(*(ptr)), rcu_head))
- #if defined(CONFIG_TINY_RCU) || defined(CONFIG_RCU_NOCB_CPU_ALL)
+ #ifdef CONFIG_TINY_RCU
-static inline int rcu_needs_cpu(unsigned long *delta_jiffies)
+static inline int rcu_needs_cpu(u64 basemono, u64 *nextevt)
{
- *delta_jiffies = ULONG_MAX;
+ *nextevt = KTIME_MAX;
return 0;
}
- #endif /* #if defined(CONFIG_TINY_RCU) || defined(CONFIG_RCU_NOCB_CPU_ALL) */
+ #endif /* #ifdef CONFIG_TINY_RCU */
#if defined(CONFIG_RCU_NOCB_CPU_ALL)
static inline bool rcu_is_nocb_cpu(int cpu) { return true; }
diff --cc include/linux/rcutree.h
index db2e31beaae7,3fa4a43ab415..000000000000
--- a/include/linux/rcutree.h
+++ b/include/linux/rcutree.h
@@@ -31,9 -31,7 +31,7 @@@
#define __LINUX_RCUTREE_H
void rcu_note_context_switch(void);
- #ifndef CONFIG_RCU_NOCB_CPU_ALL
-int rcu_needs_cpu(unsigned long *delta_jiffies);
+int rcu_needs_cpu(u64 basem, u64 *nextevt);
- #endif /* #ifndef CONFIG_RCU_NOCB_CPU_ALL */
void rcu_cpu_stall_reset(void);
/*
diff --cc kernel/rcu/tree_plugin.h
index 0ef80a0bbabb,a2f64e4fdb57..000000000000
--- a/kernel/rcu/tree_plugin.h
+++ b/kernel/rcu/tree_plugin.h
@@@ -1367,13 -1375,12 +1375,12 @@@ static void rcu_prepare_kthreads(int cp
* Because we not have RCU_FAST_NO_HZ, just check whether this CPU needs
* any flavor of RCU.
*/
- #ifndef CONFIG_RCU_NOCB_CPU_ALL
-int rcu_needs_cpu(unsigned long *delta_jiffies)
+int rcu_needs_cpu(u64 basemono, u64 *nextevt)
{
- *delta_jiffies = ULONG_MAX;
+ *nextevt = KTIME_MAX;
- return rcu_cpu_has_callbacks(NULL);
+ return IS_ENABLED(CONFIG_RCU_NOCB_CPU_ALL)
+ ? 0 : rcu_cpu_has_callbacks(NULL);
}
- #endif /* #ifndef CONFIG_RCU_NOCB_CPU_ALL */
/*
* Because we do not have RCU_FAST_NO_HZ, don't bother cleaning up
@@@ -1480,12 -1487,15 +1487,16 @@@ static bool __maybe_unused rcu_try_adva
*
* The caller must have disabled interrupts.
*/
- #ifndef CONFIG_RCU_NOCB_CPU_ALL
-int rcu_needs_cpu(unsigned long *dj)
+int rcu_needs_cpu(u64 basemono, u64 *nextevt)
{
struct rcu_dynticks *rdtp = this_cpu_ptr(&rcu_dynticks);
+ unsigned long dj;
+ if (IS_ENABLED(CONFIG_RCU_NOCB_CPU_ALL)) {
- *dj = ULONG_MAX;
++ *nextevt = KTIME_MAX;
+ return 0;
+ }
+
/* Snapshot to detect later posting of non-lazy callback. */
rdtp->nonlazy_posted_snap = rdtp->nonlazy_posted;
@@@ -1505,15 -1515,13 +1516,14 @@@
/* Request timer delay depending on laziness, and round. */
if (!rdtp->all_lazy) {
- *dj = round_up(rcu_idle_gp_delay + jiffies,
+ dj = round_up(rcu_idle_gp_delay + jiffies,
rcu_idle_gp_delay) - jiffies;
} else {
- *dj = round_jiffies(rcu_idle_lazy_gp_delay + jiffies) - jiffies;
+ dj = round_jiffies(rcu_idle_lazy_gp_delay + jiffies) - jiffies;
}
+ *nextevt = basemono + dj * TICK_NSEC;
return 0;
}
- #endif /* #ifndef CONFIG_RCU_NOCB_CPU_ALL */
/*
* Prepare a CPU for idle from an RCU perspective. The first major task
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