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

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Message-ID: <yw7aumjfrefi5cdejjgtjfeusaihfh5yjuhry3xvetjld36fgi@ob4a6lwdlqt4>
Date: Fri, 16 May 2025 14:02:22 +0800
From: Shung-Hsi Yu <shung-hsi.yu@...e.com>
To: Kees Cook <kees@...nel.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>, 
	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 Thu, May 15, 2025 at 02:42:14PM -0700, Kees Cook wrote:
> Hi,
> 
> 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.
> 
> Thanks!
> 
> -Kees
> 
> [1] https://lore.kernel.org/lkml/20250515-bpf-verifier-slowdown-vwo2meju4cgp2su5ckj@6gi6ssxbnfqg/
> 
> Kees Cook (2):
>   mm: vmalloc: Actually use the in-place vrealloc region
>   mm: vmalloc: Only zero-init on vrealloc shrink

Thank you for the prompt fix! I'll remember to include a more thorough
note on reproducing the issue next time.

With the patchset applied, BPF selftests on both 6.15-rc6 and 6.14.7-rc2
passes successfully.

Tested-by: Shung-Hsi Yu <shung-hsi.yu@...e.com>