linux-kernel - Re: [PATCH v3 6/6] freezer,sched: Rewrite core freezer logic

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Date:   Mon, 26 Sep 2022 20:06:46 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Christian Borntraeger <borntraeger@...ux.ibm.com>
Cc:     bigeasy@...utronix.de, dietmar.eggemann@....com,
        ebiederm@...ssion.com, linux-kernel@...r.kernel.org,
        linux-pm@...r.kernel.org, mgorman@...e.de, mingo@...nel.org,
        oleg@...hat.com, rjw@...ysocki.net, rostedt@...dmis.org,
        tj@...nel.org, vincent.guittot@...aro.org, will@...nel.org,
        Marc Hartmayer <mhartmay@...ux.ibm.com>,
        Amit Shah <amit@...nel.org>,
        "virtualization@...ts.linux-foundation.org" 
        <virtualization@...ts.linux-foundation.org>
Subject: Re: [PATCH v3 6/6] freezer,sched: Rewrite core freezer logic

On Mon, Sep 26, 2022 at 05:49:16PM +0200, Christian Borntraeger wrote:

> Hmm,
> 
> #define ___wait_is_interruptible(state)                                         \
>         (!__builtin_constant_p(state) ||                                        \
>                 state == TASK_INTERRUPTIBLE || state == TASK_KILLABLE)          \
> 
> That would not trigger when state is also TASK_FREEZABLE, no?

Spot on!

signal_pending_state() writes that as:

	state & (TASK_INTERRUPTIBLE | TASK_WAKEKILL)

which is the correct form.

diff --git a/include/linux/wait.h b/include/linux/wait.h
index 14ad8a0e9fac..7f5a51aae0a7 100644
--- a/include/linux/wait.h
+++ b/include/linux/wait.h
@@ -281,7 +281,7 @@ static inline void wake_up_pollfree(struct wait_queue_head *wq_head)
 
 #define ___wait_is_interruptible(state)						\
 	(!__builtin_constant_p(state) ||					\
-		state == TASK_INTERRUPTIBLE || state == TASK_KILLABLE)		\
+	 (state & (TASK_INTERRUPTIBLE | TASK_WAKEKILL)))
 
 extern void init_wait_entry(struct wait_queue_entry *wq_entry, int flags);
 

Let me go git-grep some to see if there's more similar fail.