linux-kernel - Re: [PATCH 1/2 v2] lib/vsprintf: Remove static_branch_likely() from __ptr_to

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Message-ID: <YufDcPfth9JH6SaV@zx2c4.com>
Date:   Mon, 1 Aug 2022 14:13:36 +0200
From:   "Jason A. Donenfeld" <Jason@...c4.com>
To:     Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc:     linux-kernel@...r.kernel.org,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        John Ogness <john.ogness@...utronix.de>,
        Mike Galbraith <efault@....de>, Petr Mladek <pmladek@...e.com>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Sergey Senozhatsky <senozhatsky@...omium.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Theodore Ts'o <tytso@....edu>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH 1/2 v2] lib/vsprintf: Remove static_branch_likely() from
 __ptr_to_hashval().

Also,

On Fri, Jul 29, 2022 at 05:47:15PM +0200, Sebastian Andrzej Siewior wrote:
>  		if (!filled) {
>  			get_random_bytes(&ptr_key, sizeof(ptr_key));
> -			queue_work(system_unbound_wq, &enable_ptr_key_work);
> +			/* Pairs with smp_rmb() before reading ptr_key. */
> +			smp_wmb();
> +			WRITE_ONCE(filled_random_ptr_key, true);
>  			filled = true;

Also, should `filled` be changed there?

Jason