linux-kernel - Re: [PATCH 2/7] x86/mm: Unify pgtable_l5

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Message-ID: <alpine.DEB.2.21.1805191044350.1599@nanos.tec.linutronix.de>
Date:   Sat, 19 May 2018 10:44:47 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
cc:     Ingo Molnar <mingo@...hat.com>, x86@...nel.org,
        "H. Peter Anvin" <hpa@...or.com>, Hugh Dickins <hughd@...gle.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/7] x86/mm: Unify pgtable_l5_enabled usage in early boot
 code

On Fri, 18 May 2018, Kirill A. Shutemov wrote:

> Usually pgtable_l5_enabled is defined using cpu_feature_enabled().
> cpu_feature_enabled() is not available in early boot code. We use
> several different preprocessor tricks to get around it. It's messy.
> 
> Unify them all.
> 
> If cpu_feature_enabled() is not yet available, USE_EARLY_PGTABLE_L5 can
> be defined before all includes. It makes pgtable_l5_enabled rely on
> __pgtable_l5_enabled variable instead. This approach fits all early
> users.
> 
> Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>

Reviewed-by: Thomas Gleixner <tglx@...utronix.de>