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

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Date:   Mon, 1 Aug 2022 14:41:43 +0200
From:   Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:     "Jason A. Donenfeld" <Jason@...c4.com>
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().

On 2022-08-01 14:11:33 [+0200], Jason A. Donenfeld wrote:
> > --- a/lib/vsprintf.c
> > +++ b/lib/vsprintf.c
> > @@ -750,12 +750,7 @@ static int __init debug_boot_weak_hash_e
> >  }
> >  early_param("debug_boot_weak_hash", debug_boot_weak_hash_enable);
> >  
> > -static DEFINE_STATIC_KEY_FALSE(filled_random_ptr_key);
> > -
> > -static void enable_ptr_key_workfn(struct work_struct *work)
> > -{
> > -	static_branch_enable(&filled_random_ptr_key);
> > -}
> > +static bool filled_random_ptr_key;
> 
> This should be __read_mostly, right? Just like ptr_key.

could be, yes.

> Jason

Sebastian