linux-kernel - Re: [PATCH v7] printk: hash addresses printed with %p

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Message-ID: <CAHmME9r6JfP0u2htKAebsfWxPGOc2nthqe56r2LN4VWJQD=z0Q@mail.gmail.com>
Date:   Tue, 31 Oct 2017 15:22:27 +0100
From:   "Jason A. Donenfeld" <Jason@...c4.com>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     "Tobin C. Harding" <me@...in.cc>,
        kernel-hardening@...ts.openwall.com,
        "Theodore Ts'o" <tytso@....edu>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Kees Cook <keescook@...omium.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Tycho Andersen <tycho@...ker.com>,
        "Roberts, William C" <william.c.roberts@...el.com>,
        Tejun Heo <tj@...nel.org>,
        Jordan Glover <Golden_Miller83@...tonmail.ch>,
        Greg KH <gregkh@...uxfoundation.org>,
        Petr Mladek <pmladek@...e.com>, Joe Perches <joe@...ches.com>,
        Ian Campbell <ijc@...lion.org.uk>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <wilal.deacon@....com>,
        Chris Fries <cfries@...gle.com>,
        Dave Weinstein <olorin@...gle.com>,
        Daniel Micay <danielmicay@...il.com>,
        Djalal Harouni <tixxdz@...il.com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v7] printk: hash addresses printed with %p

On Mon, Oct 30, 2017 at 9:22 PM, Steven Rostedt <rostedt@...dmis.org> wrote:
> How quickly do you need static_branch_disable() executed? You could
> always pass the work off to a worker thread (that can schedule).
>
> random_ready_callback -> initiates worker thread -> enables the static branch

I had already suggested that much earlier in the thread, but
discounted it in the very same suggestion, because that branch turns
out to be not that expensive anyway, and I think it's more important
that we're able to print meaningful values as soon as we can, rather
than waiting for the scheduler.