linux-kernel - Re: [PATCH RT V2] sched: Prevent task state corruption by spurious lock wakeup

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Date:   Tue, 6 Jun 2017 18:28:15 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        linux-rt-users <linux-rt-users@...r.kernel.org>,
        Sebastian Sewior <bigeasy@...utronix.de>,
        Steven Rostedt <rostedt@...dmis.org>,
        Mathias Koehrer <mathias.koehrer@...s.com>,
        David Hauck <davidh@...acquire.com>
Subject: Re: [PATCH RT V2] sched: Prevent task state corruption by spurious
 lock wakeup

On Tue, Jun 06, 2017 at 02:20:37PM +0200, Thomas Gleixner wrote:
> --- a/kernel/sched/core.c
> +++ b/kernel/sched/core.c
> @@ -2210,7 +2210,7 @@ EXPORT_SYMBOL(wake_up_process);
>   */
>  int wake_up_lock_sleeper(struct task_struct *p)
>  {
> -	return try_to_wake_up(p, TASK_ALL, WF_LOCK_SLEEPER);
> +	return try_to_wake_up(p, TASK_UNINTERRUPTIBLE, WF_LOCK_SLEEPER);
>  }
>  
>  int wake_up_state(struct task_struct *p, unsigned int state)

Do we want this?

---
Subject: sched: Remove TASK_ALL

It's unused:

$ git grep "\<TASK_ALL\>" | wc -l
1

And dangerous, kill the bugger.

Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
---
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 3dfa5f99d6ee..e88aadbe2071 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -94,7 +94,6 @@ struct task_group;
 
 /* Convenience macros for the sake of wake_up(): */
 #define TASK_NORMAL			(TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE)
-#define TASK_ALL			(TASK_NORMAL | __TASK_STOPPED | __TASK_TRACED)
 
 /* get_task_state(): */
 #define TASK_REPORT			(TASK_RUNNING | TASK_INTERRUPTIBLE | \