linux-kernel - Re: [PATCH v1 1/2] x86/power/64: Support unaligned addresses for temporary mapping

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Date:	Wed, 3 Aug 2016 08:29:42 -0700
From:	Thomas Garnier <thgarnie@...gle.com>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H . Peter Anvin" <hpa@...or.com>,
	Kees Cook <keescook@...omium.org>,
	"Rafael J . Wysocki" <rjw@...ysocki.net>,
	Pavel Machek <pavel@....cz>,
	"the arch/x86 maintainers" <x86@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux PM list <linux-pm@...r.kernel.org>,
	"kernel-hardening@...ts.openwall.com" 
	<kernel-hardening@...ts.openwall.com>
Subject: Re: [PATCH v1 1/2] x86/power/64: Support unaligned addresses for
 temporary mapping

On Tue, Aug 2, 2016 at 12:55 PM, Yinghai Lu <yinghai@...nel.org> wrote:
> On Tue, Aug 2, 2016 at 10:48 AM, Thomas Garnier <thgarnie@...gle.com> wrote:
>> On Tue, Aug 2, 2016 at 10:36 AM, Yinghai Lu <yinghai@...nel.org> wrote:
>>>
>>> Looks like we need to change the loop from phys address to virtual
>>> address instead.
>>> to avoid the overflow.
>
> something like attached.

I tested it and it worked well. I just got this warning on build:

In file included from arch/x86/mm/init_64.c:60:0:
arch/x86/mm/ident_map.c: In function ‘ident_pmd_init’:
arch/x86/mm/ident_map.c:18:29: warning: suggest parentheses around
arithmetic in operand of ‘|’ [-Wparentheses]
    set_pmd(pmd, __pmd(vaddr - off | info->pmd_flag));

Do you want to resend your version for integration?