linux-kernel - Re: [PATCH?] uprobes: change uprobe_write

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Message-ID: <CA+55aFxKk+O4e51sq6iqunVWAwKfNAnZ-3=aZT-VuRpDAZUnzQ@mail.gmail.com>
Date:	Tue, 3 Dec 2013 14:01:47 -0800
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	"H. Peter Anvin" <hpa@...or.com>, Hugh Dickins <hughd@...gle.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Jiri Kosina <jkosina@...e.cz>,
	Andi Kleen <andi@...stfloor.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"the arch/x86 maintainers" <x86@...nel.org>,
	Andi Kleen <ak@...ux.intel.com>,
	Ingo Molnar <mingo@...nel.org>, Borislav Petkov <bp@...en8.de>
Subject: Re: [PATCH?] uprobes: change uprobe_write_opcode() to modify the page directly

On Tue, Dec 3, 2013 at 12:54 PM, Oleg Nesterov <oleg@...hat.com> wrote:
>
> So do you think the patch I sent is wrong? Why?

I think the TLB shootdown should guarantee that it's ok on other
CPU's, since that's basically what we do on mmap.

But looking closer at this, I think I see why the old code did what it
did. I think it's breaking shared mmap pages on purpose rather than
dirtying them. Which is probably the right thing to do.

              Linus
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