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rcu/nocb: Fix dump_tree hierarchy print always active 

[ Upstream commit 610dea36d3083a977e4f156206cbe1eaa2a532f0 ]

Commit 18cd8c93e6 ("rcu/nocb: Print gp/cb kthread hierarchy if
dump_tree") added print statements to rcu_organize_nocb_kthreads for
debugging, but incorrectly guarded them, causing the function to always
spew out its message.

This patch fixes it by guarding both pr_alert statements with dump_tree,
while also changing the second pr_alert to a pr_cont, to print the
hierarchy in a single line (assuming that's how it was supposed to
work).

Fixes: 18cd8c93e6 ("rcu/nocb: Print gp/cb kthread hierarchy if dump_tree")
Signed-off-by: Stefan Reiter <stefan@pimaker.at>
[ paulmck: Make single-nocbs-CPU GP kthreads look less erroneous. ]
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Stefan Reiter 2019-10-04 19:49:10 +00:00 committed by Greg Kroah-Hartman
parent 2339f7a55c
commit 3ece067c12
1 changed files with 17 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

22
kernel/rcu/tree_plugin.h
View File

@ -2322,6 +2322,8 @@ static void __init rcu_organize_nocb_kthreads(void)
{
int cpu;
bool firsttime = true;
bool gotnocbs = false;
bool gotnocbscbs = true;
int ls = rcu_nocb_gp_stride;
int nl = 0; /* Next GP kthread. */
struct rcu_data *rdp;
@ -2344,21 +2346,31 @@ static void __init rcu_organize_nocb_kthreads(void)
rdp = per_cpu_ptr(&rcu_data, cpu);
if (rdp->cpu >= nl) {
/* New GP kthread, set up for CBs & next GP. */
gotnocbs = true;
nl = DIV_ROUND_UP(rdp->cpu + 1, ls) * ls;
rdp->nocb_gp_rdp = rdp;
rdp_gp = rdp;
if (!firsttime && dump_tree)
pr_cont("\n");
firsttime = false;
pr_alert("%s: No-CB GP kthread CPU %d:", __func__, cpu);
if (dump_tree) {
if (!firsttime)
pr_cont("%s\n", gotnocbscbs
? "" : " (self only)");
gotnocbscbs = false;
firsttime = false;
pr_alert("%s: No-CB GP kthread CPU %d:",
__func__, cpu);
}
} else {
/* Another CB kthread, link to previous GP kthread. */
gotnocbscbs = true;
rdp->nocb_gp_rdp = rdp_gp;
rdp_prev->nocb_next_cb_rdp = rdp;
pr_alert(" %d", cpu);
if (dump_tree)
pr_cont(" %d", cpu);
}
rdp_prev = rdp;
}
if (gotnocbs && dump_tree)
pr_cont("%s\n", gotnocbscbs ? "" : " (self only)");
}
/*