linux-kernel - [tip:sched/core] ia64/topology: Remove cpus

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Date:   Sat, 15 Apr 2017 07:15:54 -0700
From:   tip-bot for Thomas Gleixner <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     tglx@...utronix.de, viresh.kumar@...aro.org, bigeasy@...utronix.de,
        tj@...nel.org, jiangshanlai@...il.com, fenghua.yu@...el.com,
        linux-kernel@...r.kernel.org, peterz@...radead.org,
        lenb@...nel.org, tony.luck@...el.com, davem@...emloft.net,
        rjw@...ysocki.net, hpa@...or.com, mingo@...nel.org,
        mpe@...erman.id.au, herbert@...dor.apana.org.au,
        benh@...nel.crashing.org
Subject: [tip:sched/core] ia64/topology: Remove cpus_allowed manipulation

Commit-ID:  048c9b954e20396e0c45ee778466994d1be2e612
Gitweb:     http://git.kernel.org/tip/048c9b954e20396e0c45ee778466994d1be2e612
Author:     Thomas Gleixner <tglx@...utronix.de>
AuthorDate: Wed, 12 Apr 2017 22:07:27 +0200
Committer:  Thomas Gleixner <tglx@...utronix.de>
CommitDate: Sat, 15 Apr 2017 12:20:52 +0200

ia64/topology: Remove cpus_allowed manipulation

The CPU hotplug callback fiddles with the cpus_allowed pointer to pin the
calling thread on the plugged CPU. That's already guaranteed by the hotplug
core code.

Remove it.

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Cc: Fenghua Yu <fenghua.yu@...el.com>
Cc: Tony Luck <tony.luck@...el.com>
Cc: linux-ia64@...r.kernel.org
Cc: Herbert Xu <herbert@...dor.apana.org.au>
Cc: "Rafael J. Wysocki" <rjw@...ysocki.net>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc: Sebastian Siewior <bigeasy@...utronix.de>
Cc: Lai Jiangshan <jiangshanlai@...il.com>
Cc: Viresh Kumar <viresh.kumar@...aro.org>
Cc: Michael Ellerman <mpe@...erman.id.au>
Cc: Tejun Heo <tj@...nel.org>
Cc: "David S. Miller" <davem@...emloft.net>
Cc: Len Brown <lenb@...nel.org>
Link: http://lkml.kernel.org/r/20170412201042.174518069@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>

---
 arch/ia64/kernel/topology.c | 6 ------
 1 file changed, 6 deletions(-)

diff --git a/arch/ia64/kernel/topology.c b/arch/ia64/kernel/topology.c
index 1a68f01..d76529c 100644
--- a/arch/ia64/kernel/topology.c
+++ b/arch/ia64/kernel/topology.c
@@ -355,18 +355,12 @@ static int cache_add_dev(unsigned int cpu)
 	unsigned long i, j;
 	struct cache_info *this_object;
 	int retval = 0;
-	cpumask_t oldmask;

 	if (all_cpu_cache_info[cpu].kobj.parent)
 		return 0;

-	oldmask = current->cpus_allowed;
-	retval = set_cpus_allowed_ptr(current, cpumask_of(cpu));
-	if (unlikely(retval))
-		return retval;

 	retval = cpu_cache_sysfs_init(cpu);
-	set_cpus_allowed_ptr(current, &oldmask);
 	if (unlikely(retval < 0))
 		return retval;