linux-kernel - Re: [PATCH 06/11] x86/virt/guest/xen: Remove use of pgd

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Message-ID: <CA+55aFw5BLBTFWQpcOGYv4ALAM02aywTk1vz5ng=wqPnNH3qKw@mail.gmail.com>
Date:	Tue, 22 Sep 2015 10:58:06 -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-mm <linux-mm@...ck.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>,
	Waiman Long <waiman.long@...com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH 06/11] x86/virt/guest/xen: Remove use of pgd_list from the
 Xen guest code

On Mon, Sep 21, 2015 at 11:23 PM, Ingo Molnar <mingo@...nel.org> wrote:
> xen_mm_pin_all()/unpin_all() are used to implement full guest instance
> suspend/restore. It's a stop-all method that needs to iterate through
> all allocated pgds in the system to fix them up for Xen's use.

And _this_ is why I'd reall ylike that "for_each_mm()" helper.

Yeah, yeah, maybe it would require syntax like

    for_each_mm (tsk, mm) {
        ...
    } end_for_each_mm(mm);

to do variable allocation things or cleanups (ie "end_for_each_mm()"
might drop the task lock etc), but wouldn't that still be better than
this complex boilerplate thing?

                    Linus
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