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Date: Thu, 16 Jun 2016 10:33:39 -0500
From: Josh Poimboeuf <jpoimboe@...hat.com>
To: Andy Lutomirski <luto@...nel.org>
Cc: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
x86@...nel.org, Borislav Petkov <bp@...en8.de>,
Nadav Amit <nadav.amit@...il.com>, Kees Cook <keescook@...omium.org>,
Brian Gerst <brgerst@...il.com>,
"kernel-hardening@...ts.openwall.com" <kernel-hardening@...ts.openwall.com>,
Linus Torvalds <torvalds@...ux-foundation.org>,
Vladimir Davydov <vdavydov@...tuozzo.com>,
Johannes Weiner <hannes@...xchg.org>, Michal Hocko <mhocko@...nel.org>,
linux-mm@...ck.org
Subject: Re: [PATCH 04/13] mm: Track NR_KERNEL_STACK in pages instead of
number of stacks
On Wed, Jun 15, 2016 at 05:28:26PM -0700, Andy Lutomirski wrote:
> Currently, NR_KERNEL_STACK tracks the number of kernel stacks in a
> zone. This only makes sense if each kernel stack exists entirely in
> one zone, and allowing vmapped stacks could break this assumption.
>
> It turns out that the code for tracking kernel stack allocations in
> units of pages is slightly simpler, so just switch to counting
> pages.
>
> Cc: Vladimir Davydov <vdavydov@...tuozzo.com>
> Cc: Johannes Weiner <hannes@...xchg.org>
> Cc: Michal Hocko <mhocko@...nel.org>
> Cc: linux-mm@...ck.org
> Signed-off-by: Andy Lutomirski <luto@...nel.org>
> ---
> fs/proc/meminfo.c | 2 +-
> kernel/fork.c | 3 ++-
> mm/page_alloc.c | 3 +--
> 3 files changed, 4 insertions(+), 4 deletions(-)
You missed another usage of NR_KERNEL_STACK in drivers/base/node.c.
--
Josh
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