linux-kernel - [tip:core/smp] smp: Allocate smp_call_on

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Message-ID: <tip-8db549491c4a3ce9e1d509b75f78516e497f48ec@git.kernel.org>
Date:   Thu, 22 Sep 2016 06:58:28 -0700
From:   tip-bot for Peter Zijlstra <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     tglx@...utronix.de, mingo@...nel.org, hpa@...or.com,
        peterz@...radead.org, linux-kernel@...r.kernel.org,
        torvalds@...ux-foundation.org, bp@...e.de
Subject: [tip:core/smp] smp: Allocate smp_call_on_cpu() workqueue on stack
 too

Commit-ID:  8db549491c4a3ce9e1d509b75f78516e497f48ec
Gitweb:     http://git.kernel.org/tip/8db549491c4a3ce9e1d509b75f78516e497f48ec
Author:     Peter Zijlstra <peterz@...radead.org>
AuthorDate: Sun, 11 Sep 2016 10:36:26 +0200
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Thu, 22 Sep 2016 14:49:10 +0200

smp: Allocate smp_call_on_cpu() workqueue on stack too

The SMP IPI struct descriptor is allocated on the stack except for the
workqueue and lockdep complains:

  INFO: trying to register non-static key.
  the code is fine but needs lockdep annotation.
  turning off the locking correctness validator.
  CPU: 0 PID: 110 Comm: kworker/0:1 Not tainted 4.8.0-rc5+ #14
  Hardware name: Dell Inc. Precision T3600/0PTTT9, BIOS A13 05/11/2014
  Workqueue: events smp_call_on_cpu_callback
  ...
  Call Trace:
    dump_stack
    register_lock_class
    ? __lock_acquire
    __lock_acquire
    ? __lock_acquire
    lock_acquire
    ? process_one_work
    process_one_work
    ? process_one_work
    worker_thread
    ? process_one_work
    ? process_one_work
    kthread
    ? kthread_create_on_node
    ret_from_fork

So allocate it on the stack too.

Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
[ Test and write commit message. ]
Signed-off-by: Borislav Petkov <bp@...e.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Link: http://lkml.kernel.org/r/20160911084323.jhtnpb4b37t5tlno@pd.tnic
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 kernel/smp.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/kernel/smp.c b/kernel/smp.c
index f4f6137..bba3b20 100644
--- a/kernel/smp.c
+++ b/kernel/smp.c
@@ -759,13 +759,14 @@ static void smp_call_on_cpu_callback(struct work_struct *work)
 int smp_call_on_cpu(unsigned int cpu, int (*func)(void *), void *par, bool phys)
 {
 	struct smp_call_on_cpu_struct sscs = {
-		.work = __WORK_INITIALIZER(sscs.work, smp_call_on_cpu_callback),
 		.done = COMPLETION_INITIALIZER_ONSTACK(sscs.done),
 		.func = func,
 		.data = par,
 		.cpu  = phys ? cpu : -1,
 	};
 
+	INIT_WORK_ONSTACK(&sscs.work, smp_call_on_cpu_callback);
+
 	if (cpu >= nr_cpu_ids || !cpu_online(cpu))
 		return -ENXIO;