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Message-ID: <ZfOielNSgWTRyDFB@lothringen>
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"...
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