linux-kernel - Re: write_lock_irq(&tasklist

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Date:   Wed, 23 May 2018 09:26:35 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Will Deacon <will.deacon@....com>
Cc:     psodagud@...eaurora.org, Kees Cook <keescook@...omium.org>,
        Andy Lutomirski <luto@...capital.net>,
        Will Drewry <wad@...omium.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Rik van Riel <riel@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Eric Biggers <ebiggers@...gle.com>,
        Frederic Weisbecker <fweisbec@...il.com>, sherryy@...roid.com,
        Vegard Nossum <vegard.nossum@...cle.com>,
        Christoph Lameter <cl@...ux.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Sasha Levin <alexander.levin@...izon.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Boqun Feng <boqun.feng@...il.com>
Subject: Re: write_lock_irq(&tasklist_lock)

On Wed, May 23, 2018 at 8:35 AM Will Deacon <will.deacon@....com> wrote:

> In other words, qrwlock requires consistent locking order wrt spinlocks.

I *thought* lockdep already tracked and detected this. Or is that only with
with the sleeping versions?

But yes, that's equivalent to the irq-unfairness thing we have a special
case for.

              Linus