linux-kernel - Re: [PATCH 09/30] x86, kaiser: only populate shadow page tables for userspace

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Message-ID: <20171121070553.ocar3maqbwofvj7t@gmail.com>
Date:   Tue, 21 Nov 2017 08:05:53 +0100
From:   Ingo Molnar <mingo@...nel.org>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     Dave Hansen <dave.hansen@...ux.intel.com>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        moritz.lipp@...k.tugraz.at, daniel.gruss@...k.tugraz.at,
        michael.schwarz@...k.tugraz.at, richard.fellner@...dent.tugraz.at,
        luto@...nel.org, torvalds@...ux-foundation.org,
        keescook@...gle.com, hughd@...gle.com, x86@...nel.org
Subject: Re: [PATCH 09/30] x86, kaiser: only populate shadow page tables for
 userspace


* Thomas Gleixner <tglx@...utronix.de> wrote:

> > + */
> > +static inline bool pgd_userspace_access(pgd_t pgd)
> > +{
> > +	return (pgd.pgd & _PAGE_USER);
> > +}

Also a nit: the parentheses are superfluous - these aren't macros.

Thanks,

	Ingo