linux-kernel - Re: [PATCH v3 1/10] x86/vdso32: Define PGTABLE

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Date:	Thu, 20 Aug 2015 21:46:50 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Toshi Kani <toshi.kani@...com>
cc:	hpa@...or.com, mingo@...hat.com, akpm@...ux-foundation.org,
	bp@...en8.de, linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	x86@...nel.org, jgross@...e.com, konrad.wilk@...cle.com,
	elliott@...com
Subject: Re: [PATCH v3 1/10] x86/vdso32: Define PGTABLE_LEVELS to 32bit
 VDSO

On Wed, 5 Aug 2015, Toshi Kani wrote:

> In case of CONFIG_X86_64, vdso32/vclock_gettime.c fakes a 32bit
> kernel configuration by re-defining it to CONFIG_X86_32.  However,
> it does not re-define CONFIG_PGTABLE_LEVELS leaving it as 4 levels.
> Fix it by re-defining CONFIG_PGTABLE_LEVELS to 2 as X86_PAE is not
> set.

You fail to explain WHY this is required. I have not yet spotted any
code in vclock_gettime.c which is affected by this.

Thanks,

	tglx

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