linux-kernel - Re: [PATCH v2 01/26] rculist: introduce list_next_or_null_rr

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Message-ID: <CA+55aFx+4D5bBYSKb5jKjJ8SP=osGB=PCf8vW3RZH+R5fp5jgQ@mail.gmail.com>
Date:   Tue, 22 May 2018 09:38:13 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Roman Pen <roman.penyaev@...fitbricks.com>
Cc:     Paul McKenney <paulmck@...ux.vnet.ibm.com>,
        linux-block <linux-block@...r.kernel.org>,
        linux-rdma <linux-rdma@...r.kernel.org>,
        Jens Axboe <axboe@...nel.dk>,
        Christoph Hellwig <hch@...radead.org>,
        Sagi Grimberg <sagi@...mberg.me>,
        Bart Van Assche <bart.vanassche@...disk.com>,
        Or Gerlitz <ogerlitz@...lanox.com>,
        Doug Ledford <dledford@...hat.com>,
        swapnil.ingle@...fitbricks.com, danil.kipnis@...fitbricks.com,
        Jinpu Wang <jinpu.wang@...fitbricks.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 01/26] rculist: introduce list_next_or_null_rr_rcu()

On Tue, May 22, 2018 at 2:09 AM Roman Penyaev <
roman.penyaev@...fitbricks.com> wrote:

> Should I resend current patch with more clear comments about how careful
> caller should be with a leaking pointer?

No. Even if we go your way, there is *one* single user, and that one is
special and needs to take a lot more care.

Just roll your own version, and make it an inline function like I've asked
now now many times, and add a shit-ton of explanations of why it's safe to
use in that *one* situation.

I don't want any crazy and unsafe stuff in the generic header file that
absolutely *nobody* should ever use.

                  Linus