linux-kernel - Re: [PATCH] timer/migration: Remove buggy early return on deactivation [was Re: Unexplained long boot delays [Was Re: [GIT PULL] RCU changes for v6.9]]

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Date: Fri, 15 Mar 2024 02:20:58 +0100
From: Frederic Weisbecker <frederic@...nel.org>
To: Boqun Feng <boqun.feng@...il.com>,
	Florian Fainelli <f.fainelli@...il.com>
Cc: Thomas Gleixner <tglx@...utronix.de>,
	"Russell King (Oracle)" <linux@...linux.org.uk>,
	Joel Fernandes <joel@...lfernandes.org>,
	Anna-Maria Behnsen <anna-maria@...utronix.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, kernel-team@...a.com,
	paulmck@...nel.org, mingo@...nel.org, rcu@...r.kernel.org,
	neeraj.upadhyay@....com, urezki@...il.com,
	qiang.zhang1211@...il.com, bigeasy@...utronix.de,
	chenzhongjin@...wei.com, yangjihong1@...wei.com,
	rostedt@...dmis.org, Justin Chen <justin.chen@...adcom.com>
Subject: Re: [PATCH] timer/migration: Remove buggy early return on
 deactivation [was Re: Unexplained long boot delays [Was Re: [GIT PULL] RCU
 changes for v6.9]]

On Fri, Mar 15, 2024 at 02:14:47AM +0100, Frederic Weisbecker wrote:
> This isn't proper to single level hierarchy though. A similar issue,
> although slightly different, may arise on multi-level:
> 
>                             [GRP1:0]
>                          migrator = GRP0:0
>                          active   = GRP0:0
>                          nextevt  = T0:0i, T0:1
>                          /              \
>               [GRP0:0]                  [GRP0:1]
>            migrator = 0              migrator = NONE
>            active   = 0              active   = NONE
>            nextevt  = T0i            nextevt  = T2
>            /         \                /         \
>           0 (T0i)     1 (T1)         2 (T2)      3
>         idle         idle            idle         idle

The "idle" below "0" above should be "active"...