Subject: Re: [PATCH] x86: make DR*_RESERVED unsigned long

From: "H. Peter Anvin" <[email-masked]>
Date: Wed, 24 Apr 2013 11:45:01 -0700

On 04/24/2013 10:07 AM, Oleg Nesterov wrote:
> DR6_RESERVED and DR_CONTROL_RESERVED are used to clear the set
> bits in the "unsigned long" data, make them long to ensure that
> "&~" doesn't clear the upper bits.
> 
> do_debug() and ptrace_write_dr7() which use DR*_RESERVED look
> safe, but probably it makes sense to cleanup anyway.
> 
> Reported-by: Linus Torvalds <[email-masked]>
> Signed-off-by: Oleg Nesterov <[email-masked]>

Can you please put in the description if this is a manifest or
non-manifest bug and, if manifest, what the issues are?  It greatly
affects what we otherwise have to do to address the bug.

Also, the -UL suffix is usually capitalized in our codebase.

	-hpa