From c4e21174a425cf8e174e20d7c4cff7dcbb9ccca8 Mon Sep 17 00:00:00 2001
From: Qiao Nuohan <qiaonuohan@cn.fujitsu.com>
Date: Sun, 14 Sep 2014 16:20:53 +0800
Subject: [PATCH 3/3] modify timer to hide cpus' data

With this patch, command timer can hide offline cpus's data. Please check
the following example.

cpu #2 is offline. The output of original timer is:
<cut>
crash> timer
TVEC_BASES[0]: ffffffff81c994c0
  JIFFIES 
4310640297
  EXPIRES      TIMER_LIST         FUNCTION    
4310640004  ffff88003fc103c0  ffffffff8107c150  <delayed_work_timer_fn>
4310641008  ffff88003d4be348  ffffffff814f0840  <dev_watchdog>
4310643584  ffffffff819a6c50  ffffffff8107c150  <delayed_work_timer_fn>
4310647936  ffff88003691fc48  ffffffff8107c150  <delayed_work_timer_fn>
4310648544  ffff88003b781db0  ffffffff8106e070  <process_timeout>
4310868000  ffff88003fc0d920  ffffffff81030610  <mce_timer_fn>
4310921216  ffffffff81e147d0  ffffffff8154f790  <inet_frag_secret_rebuild>
TVEC_BASES[1]: ffff88003db08000
  JIFFIES 
4310640297
  EXPIRES      TIMER_LIST         FUNCTION    
4310635000  ffff88003fc903c0  ffffffff8107c150  <delayed_work_timer_fn>
4310665216  ffffffff819a75c0  ffffffff8107c150  <delayed_work_timer_fn>
4310867997  ffff88003fc8d920  ffffffff81030610  <mce_timer_fn>
4310933504  ffffffffa0311750  ffffffff8154f790  <inet_frag_secret_rebuild>
4380688384  ffff880036dae568  ffffffff8157ed30  <ipv6_regen_rndid>
TVEC_BASES[2]: ffff88003db20000
JIFFIES
4310640297
EXPIRES     TIMER_LIST         FUNCTION    
TVEC_BASES[3]: ffff88003db44000
  JIFFIES 
4310640297
  EXPIRES      TIMER_LIST         FUNCTION    
4310639992  ffff88003fd903c0  ffffffff8107c150  <delayed_work_timer_fn>
4310641152  ffff880036ef5380  ffffffff8107c150  <delayed_work_timer_fn>
4310642176  ffff88003691f048  ffffffff8107c150  <delayed_work_timer_fn>
4310651392  ffffffff819ab310  ffffffff8107c150  <delayed_work_timer_fn>
4310666112  ffff880036a40cc8  ffffffff8129a140  <blk_rq_timed_out_timer>
4310704128  ffff88003fd93e40  ffffffff8107d1a0  <idle_worker_timeout>
4310760448  ffffffff819aaae0  ffffffff81581aa0  <addrconf_verify>
4310867991  ffff88003fd8d920  ffffffff81030610  <mce_timer_fn>
4310921216  ffffffff81e0f710  ffffffff814e4dc0  <flow_cache_new_hashrnd>
4310921216  ffffffff81e1b4d0  ffffffff8154f790  <inet_frag_secret_rebuild>
<cut>

With this patch, TVEC_BASES[2] is hide:
<cut>
TVEC_BASES[0]: ffffffff81c994c0
  JIFFIES 
4310640297
  EXPIRES      TIMER_LIST         FUNCTION    
4310640004  ffff88003fc103c0  ffffffff8107c150  <delayed_work_timer_fn>
4310641008  ffff88003d4be348  ffffffff814f0840  <dev_watchdog>
4310643584  ffffffff819a6c50  ffffffff8107c150  <delayed_work_timer_fn>
4310647936  ffff88003691fc48  ffffffff8107c150  <delayed_work_timer_fn>
4310648544  ffff88003b781db0  ffffffff8106e070  <process_timeout>
4310868000  ffff88003fc0d920  ffffffff81030610  <mce_timer_fn>
4310921216  ffffffff81e147d0  ffffffff8154f790  <inet_frag_secret_rebuild>
TVEC_BASES[1]: ffff88003db08000
  JIFFIES 
4310640297
  EXPIRES      TIMER_LIST         FUNCTION    
4310635000  ffff88003fc903c0  ffffffff8107c150  <delayed_work_timer_fn>
4310665216  ffffffff819a75c0  ffffffff8107c150  <delayed_work_timer_fn>
4310867997  ffff88003fc8d920  ffffffff81030610  <mce_timer_fn>
4310933504  ffffffffa0311750  ffffffff8154f790  <inet_frag_secret_rebuild>
4380688384  ffff880036dae568  ffffffff8157ed30  <ipv6_regen_rndid>
TVEC_BASES[3]: ffff88003db44000
  JIFFIES 
4310640297
  EXPIRES      TIMER_LIST         FUNCTION    
4310639992  ffff88003fd903c0  ffffffff8107c150  <delayed_work_timer_fn>
4310641152  ffff880036ef5380  ffffffff8107c150  <delayed_work_timer_fn>
4310642176  ffff88003691f048  ffffffff8107c150  <delayed_work_timer_fn>
4310651392  ffffffff819ab310  ffffffff8107c150  <delayed_work_timer_fn>
4310666112  ffff880036a40cc8  ffffffff8129a140  <blk_rq_timed_out_timer>
4310704128  ffff88003fd93e40  ffffffff8107d1a0  <idle_worker_timeout>
4310760448  ffffffff819aaae0  ffffffff81581aa0  <addrconf_verify>
4310867991  ffff88003fd8d920  ffffffff81030610  <mce_timer_fn>
4310921216  ffffffff81e0f710  ffffffff814e4dc0  <flow_cache_new_hashrnd>
4310921216  ffffffff81e1b4d0  ffffffff8154f790  <inet_frag_secret_rebuild>
<cut>

Signed-off-by: Qiao Nuohan <qiaonuohan@cn.fujitsu.com>
---
 kernel.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/kernel.c b/kernel.c
index 8d3db9c..0023038 100755
--- a/kernel.c
+++ b/kernel.c
@@ -7399,6 +7399,11 @@ dump_timer_data_tvec_bases_v2(void)
 	cpu = 0;
 
 next_cpu:
+	if (!(pc->flags2 & OFFLINE_CPU) && check_offline_cpu(cpu)) {
+		if (++cpu < kt->cpus)
+			goto next_cpu;
+	}
+
 
 	count = 0;
 	td = (struct timer_data *)NULL;
-- 
1.8.5.3