linux-kernel - [tip: smp/core] torture: Replace cpu_up/down() with add/remove

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Message-ID: <158513796091.28353.8588545097621278073.tip-bot2@tip-bot2>
Date:   Wed, 25 Mar 2020 12:06:00 -0000
From:   "tip-bot2 for Qais Yousef" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Qais Yousef <qais.yousef@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        "Paul E. McKenney" <paulmck@...nel.org>, x86 <x86@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: [tip: smp/core] torture: Replace cpu_up/down() with add/remove_cpu()

The following commit has been merged into the smp/core branch of tip:

Commit-ID:     457bc8ed3ec7edc567200302d9312ac8bbc31316
Gitweb:        https://git.kernel.org/tip/457bc8ed3ec7edc567200302d9312ac8bbc31316
Author:        Qais Yousef <qais.yousef@....com>
AuthorDate:    Mon, 23 Mar 2020 13:51:08 
Committer:     Thomas Gleixner <tglx@...utronix.de>
CommitterDate: Wed, 25 Mar 2020 12:59:37 +01:00

torture: Replace cpu_up/down() with add/remove_cpu()

The core device API performs extra housekeeping bits that are missing
from directly calling cpu_up/down().

See commit a6717c01ddc2 ("powerpc/rtas: use device model APIs and
serialization during LPM") for an example description of what might go
wrong.

This also prepares to make cpu_up/down() a private interface of the CPU
subsystem.

Signed-off-by: Qais Yousef <qais.yousef@....com>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Acked-by: "Paul E. McKenney" <paulmck@...nel.org>
Link: https://lkml.kernel.org/r/20200323135110.30522-16-qais.yousef@arm.com

---
 kernel/torture.c |  9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/kernel/torture.c b/kernel/torture.c
index 7c13f55..a479689 100644
--- a/kernel/torture.c
+++ b/kernel/torture.c
@@ -97,7 +97,7 @@ bool torture_offline(int cpu, long *n_offl_attempts, long *n_offl_successes,
 			 torture_type, cpu);
 	starttime = jiffies;
 	(*n_offl_attempts)++;
-	ret = cpu_down(cpu);
+	ret = remove_cpu(cpu);
 	if (ret) {
 		if (verbose)
 			pr_alert("%s" TORTURE_FLAG
@@ -148,7 +148,7 @@ bool torture_online(int cpu, long *n_onl_attempts, long *n_onl_successes,
 			 torture_type, cpu);
 	starttime = jiffies;
 	(*n_onl_attempts)++;
-	ret = cpu_up(cpu);
+	ret = add_cpu(cpu);
 	if (ret) {
 		if (verbose)
 			pr_alert("%s" TORTURE_FLAG
@@ -192,17 +192,18 @@ torture_onoff(void *arg)
 	for_each_online_cpu(cpu)
 		maxcpu = cpu;
 	WARN_ON(maxcpu < 0);
-	if (!IS_MODULE(CONFIG_TORTURE_TEST))
+	if (!IS_MODULE(CONFIG_TORTURE_TEST)) {
 		for_each_possible_cpu(cpu) {
 			if (cpu_online(cpu))
 				continue;
-			ret = cpu_up(cpu);
+			ret = add_cpu(cpu);
 			if (ret && verbose) {
 				pr_alert("%s" TORTURE_FLAG
 					 "%s: Initial online %d: errno %d\n",
 					 __func__, torture_type, cpu, ret);
 			}
 		}
+	}
 
 	if (maxcpu == 0) {
 		VERBOSE_TOROUT_STRING("Only one CPU, so CPU-hotplug testing is disabled");