linux-kernel - Re: [PATCH 0/2] mm: vmalloc: Actually use the in-place vrealloc region

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Message-ID: <202505200904.474938A8B5@keescook>
Date: Tue, 20 May 2025 09:06:10 -0700
From: Kees Cook <kees@...nel.org>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: Shung-Hsi Yu <shung-hsi.yu@...e.com>,
	Eduard Zingerman <eddyz87@...il.com>,
	Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>,
	Uladzislau Rezki <urezki@...il.com>,
	Erhard Furtner <erhard_f@...lbox.org>,
	Danilo Krummrich <dakr@...nel.org>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, bpf@...r.kernel.org,
	linux-hardening@...r.kernel.org
Subject: Re: [PATCH 0/2] mm: vmalloc: Actually use the in-place vrealloc
 region

On Mon, May 19, 2025 at 05:06:07PM -0700, Andrew Morton wrote:
> On Mon, 19 May 2025 12:18:42 -0700 Kees Cook <kees@...nel.org> wrote:
> 
> > On Thu, May 15, 2025 at 02:42:14PM -0700, Kees Cook wrote:
> > > This fixes a performance regression[1] with vrealloc(). This needs to
> > > get into v6.15, which is where the regression originates, and then it'll
> > > get backport to the -stable releases as well.
> 
> No -stable backporting will be needed?

I think it will, since the vrealloc patches were backported
automatically, e.g. in v6.14.y: 0b391a520b4e ("mm: vmalloc: support more
granular vrealloc() sizing")

> > Andrew, can you get these to Linus this week?
> 
> Sure.

Thanks!

-- 
Kees Cook