linux-kernel - Re: [PATCH v2 1/2] jump_label: Explicitly disable jump labels in _

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Message-ID: <20180217103848.yiutigxpukxfbtze@gmail.com>
Date:   Sat, 17 Feb 2018 11:38:48 +0100
From:   Ingo Molnar <mingo@...nel.org>
To:     Josh Poimboeuf <jpoimboe@...hat.com>
Cc:     x86@...nel.org, linux-kernel@...r.kernel.org,
        Steven Rostedt <rostedt@...dmis.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Jason Baron <jbaron@...mai.com>, Borislav Petkov <bp@...e.de>
Subject: Re: [PATCH v2 1/2] jump_label: Explicitly disable jump labels in
 __init code


* Josh Poimboeuf <jpoimboe@...hat.com> wrote:

> +/* Disable any jump label entries in __init code */
> +void __init jump_label_invalidate_init(void)
> +{
> +	struct jump_entry *iter_start = __start___jump_table;
> +	struct jump_entry *iter_stop = __stop___jump_table;
> +	struct jump_entry *iter;
> +
> +	for (iter = iter_start; iter < iter_stop; iter++)
> +		if (iter->code >= (unsigned long)_sinittext &&
> +		    iter->code < (unsigned long)_einittext)
> +			iter->code = 0;
> +}
> +
> +/* Disable any jump label entries in module init code */
>  static void jump_label_invalidate_module_init(struct module *mod)
>  {
>  	struct jump_entry *iter_start = mod->jump_entries;
>  	struct jump_entry *iter_stop = iter_start + mod->num_jump_entries;
>  	struct jump_entry *iter;
>  
> -	for (iter = iter_start; iter < iter_stop; iter++) {
> +	for (iter = iter_start; iter < iter_stop; iter++)
>  		if (within_module_init(iter->code, mod))
>  			iter->code = 0;
> -	}

Why did you remove the curly braces? They are canonical kernel style for 
multi-line statements.

The new jump_label_invalidate_init() function has that problem too.

Thanks,

	Ingo