linux-kernel - Re: [RFC PATCH 09/16] PM / hibernate: Reserve swsusp key and earse footprints

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Message-ID: <20150728123523.GD12681@amd>
Date:	Tue, 28 Jul 2015 14:35:23 +0200
From:	Pavel Machek <pavel@....cz>
To:	"Lee, Chun-Yi" <joeyli.kernel@...il.com>
Cc:	linux-kernel@...r.kernel.org, linux-efi@...r.kernel.org,
	linux-pm@...r.kernel.org, "Rafael J. Wysocki" <rjw@...k.pl>,
	Matthew Garrett <matthew.garrett@...ula.com>,
	Len Brown <len.brown@...el.com>,
	Josh Boyer <jwboyer@...hat.com>,
	Vojtech Pavlik <vojtech@...e.cz>,
	Matt Fleming <matt.fleming@...el.com>,
	Jiri Kosina <jkosina@...e.cz>,
	"H. Peter Anvin" <hpa@...or.com>, "Lee, Chun-Yi" <jlee@...e.com>
Subject: Re: [RFC PATCH 09/16] PM / hibernate: Reserve swsusp key and earse
 footprints

Typo in patch subject.

> And for earsing footbprints, the codes in this patch remove setup

And two typos here.

> data that carried swsusp key, and clean the memory space that

And don't call it swsusp. Please fix globally.
								
> +++ b/arch/x86/power/hibernate_keys.c
> @@ -0,0 +1,79 @@
> +/* Swsusp keys handler
> + *
> + * Copyright (C) 2015 SUSE Linux Products GmbH. All rights

Are you sure?

> +static int __init init_hibernate_keys(void)
> +{
> +	struct swsusp_keys *keys;
> +	int ret = 0;
> +
> +	if (!keys_phys_addr)
> +		return -ENODEV;
> +
> +	keys = early_memremap(keys_phys_addr, sizeof(struct swsusp_keys));
> +
> +	/* Copy swsusp keys to a allocated page */
> +	swsusp_keys = (struct swsusp_keys *)get_zeroed_page(GFP_KERNEL);
> +	if (swsusp_keys) {
> +		*swsusp_keys = *keys;
> +	} else {
> +		pr_err("PM: Allocate swsusp keys page failed\n");
> +		ret = -ENOMEM;
> +	}
> +
> +	/* Earse keys data no matter copy success or failed */
> +	memset(keys, 0, sizeof(struct swsusp_keys));
> +	early_memunmap(keys, sizeof(struct swsusp_keys));
> +	memblock_free(keys_phys_addr, sizeof(struct swsusp_keys));
> +	keys_phys_addr = 0;
> +
> +	return ret;
> +}
> +
> +late_initcall(init_hibernate_keys);

init_hibernation_keys.


								Pavel

-- 
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