linux-kernel - Re: [PATCH 07/12] x86/virt/guest/xen: Remove use of pgd

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Message-ID: <CA+55aFzONQOsVXTECmynSAcDW_WnwOpLHMVDNUp0nsqrkYnw3Q@mail.gmail.com>
Date:	Thu, 11 Jun 2015 13:37:54 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-mml@...r.kernel.org, Andy Lutomirski <luto@...capital.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Denys Vlasenko <dvlasenk@...hat.com>,
	Brian Gerst <brgerst@...il.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Borislav Petkov <bp@...en8.de>,
	"H. Peter Anvin" <hpa@...or.com>, Oleg Nesterov <oleg@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Waiman Long <Waiman.Long@...com>
Subject: Re: [PATCH 07/12] x86/virt/guest/xen: Remove use of pgd_list from the
 Xen guest code

On Thu, Jun 11, 2015 at 7:07 AM, Ingo Molnar <mingo@...nel.org> wrote:
>
> But we want to remove the pgd_list, so convert the code over to walk
> all tasks in the system. This is an equivalent method.

This is not at all equivalent, and it looks stupid.

Don't use "for_each_process_thread(g, p)". You only care about each
mm, and threads all share the same mm, so just do

    for_each_process(p)

instead of iterating over all threads too.

No?

               Linus
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