linux-kernel - Re: [PATCH v7] module: replace module_layout with module

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Message-ID: <Y9rYcvPx4MhA+c+u@hirez.programming.kicks-ass.net>
Date:   Wed, 1 Feb 2023 22:24:02 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Song Liu <song@...nel.org>
Cc:     linux-modules@...r.kernel.org, linux-kernel@...r.kernel.org,
        hch@....de, kernel-team@...a.com,
        Luis Chamberlain <mcgrof@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Guenter Roeck <linux@...ck-us.net>,
        Christophe Leroy <christophe.leroy@...roup.eu>
Subject: Re: [PATCH v7] module: replace module_layout with module_memory

On Wed, Feb 01, 2023 at 10:44:22AM -0800, Song Liu wrote:

>  static ssize_t show_datasize(struct module_attribute *mattr,
>  			     struct module_kobject *mk, char *buffer)
>  {
> -	return sprintf(buffer, "%u\n", mk->mod->data_layout.size);
> +	unsigned int size = 0;
> +
> +	for_class_mod_mem_type(type, core) {
> +		if (type == MOD_TEXT)
> +			continue;

isn't this the same as:

	for_class_mod_mem_type(type, core_data)

?

> +		size += mk->mod->mem[type].size;
> +	}
> +	return sprintf(buffer, "%u\n", size);
>  }


> -	lockdep_free_key_range(mod->data_layout.base, mod->data_layout.size);
> +	for_class_mod_mem_type(type, core) {
> +		lockdep_free_key_range(mod->mem[type].base,
> +				       mod->mem[type].size);
> +	}

Why the core_data to core change? Specifically the difference seems to
be you now include text. Now, we shouldn't be having lockdep keys in
text, so it's harmless, still a bit weird.


Anyway, looks real good to me otherwise. Thanks!