linux-kernel - Re: [PATCH] x86: make DR6_RESERVED/DR_CONTROL

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Message-ID: <20131119192248.GA8608@redhat.com>
Date:	Tue, 19 Nov 2013 20:22:48 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...nel.org>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86: make DR6_RESERVED/DR_CONTROL_RESERVED unsigned
	long

On 11/19, Oleg Nesterov wrote:
>
> DR6_RESERVED and DR_CONTROL_RESERVED are used to clear the unwanted
> bits in the "unsigned long" data, but "ulong &= ~int" also clears the
> upper bits that are not specified in mask.
>
> This is actually fine, dr6[32:63] are reserved, but this is not clear
> so it would be better to make them "unsigned long" to cleanup the code.
>
> However, depending on sizeof(long), DR6_RESERVED should be either
> 0xFFFF0FF0 or 0xFFFFFFFF_FFFF0FF0, so this patch redefines them as
> (~ 32_bit_mask UL) to avoid ifdef's.

Peter, iirc you acked this patch, but its seems it was lost.

Oleg.

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