linux-kernel - Re: [PATCH] rcu: Narrow early boot window of illegal synchronous grace periods

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Message-ID: <20170114125017.5wp2khn5scezeuau@pd.tnic>
Date:   Sat, 14 Jan 2017 13:50:17 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     "Rafael J. Wysocki" <rafael@...nel.org>
Cc:     "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Lv <lv.zheng@...el.com>, stan.kain@...il.com,
        waffolz@...mail.com, Josh Triplett <josh@...htriplett.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        mathieu.desnoyers@...icios.com, jiangshanlai@...il.com,
        Ingo Molnar <mingo@...nel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH] rcu: Narrow early boot window of illegal synchronous
 grace periods

On Sat, Jan 14, 2017 at 01:27:40PM +0100, Rafael J. Wysocki wrote:
> OK, so this fixes the problem with synchronize_rcu_expedited() in
> acpi_os_map_cleanup(), right?

Yeah.

> I wonder if the ACPI-specific fix is still needed, then?

It is not strictly necessary. If you still think it would be better to
have it regardless, you could pick it up. I.e., making ACPI more robust,
yadda yadda.

I dunno, though, perhaps it is only complicating the code unnecessarily
and then can be safely ignored with a mental note for future freezes.

-- 
Regards/Gruss,
    Boris.

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