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Message-ID: <20171030162244.4f55e623@gandalf.local.home>
Date: Mon, 30 Oct 2017 16:22:44 -0400
From: Steven Rostedt <rostedt@...dmis.org>
To: "Tobin C. Harding" <me@...in.cc>
Cc: "Jason A. Donenfeld" <Jason@...c4.com>,
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 Wed, 25 Oct 2017 14:49:34 +1100
"Tobin C. Harding" <me@...in.cc> wrote:
>
> First, the static_key stuff.
>
> DEFINE_STATIC_KEY_TRUE(no_ptr_secret) : Doesn't sleep, just a
> declaration.
>
> if (static_branch_unlikely(&no_ptr_secret)) {} : Doesn't sleep, just
> some assembler to jump to returning true or false.
>
> static_branch_disable(&no_ptr_secret) : Doesn't sleep, just atomic read
> and set and maybe a WARN_ONCE.
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
-- Steve
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