linux-kernel - Re: [PATCH 6.14 000/197] 6.14.7-rc2 review

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Message-ID: <2025051529-mulled-cubicle-b1cd@gregkh>
Date: Thu, 15 May 2025 14:25:50 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: Shung-Hsi Yu <shung-hsi.yu@...e.com>
Cc: stable@...r.kernel.org, patches@...ts.linux.dev,
	linux-kernel@...r.kernel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, linux@...ck-us.net, shuah@...nel.org,
	patches@...nelci.org, lkft-triage@...ts.linaro.org, pavel@...x.de,
	jonathanh@...dia.com, f.fainelli@...il.com,
	sudipm.mukherjee@...il.com, srw@...dewatkins.net, rwarsow@....de,
	conor@...nel.org, hargar@...rosoft.com, broonie@...nel.org,
	kees@...nel.org
Subject: Re: [PATCH 6.14 000/197] 6.14.7-rc2 review

On Thu, May 15, 2025 at 08:15:32PM +0800, Shung-Hsi Yu wrote:
> On Wed, May 14, 2025 at 03:04:16PM +0200, Greg Kroah-Hartman wrote:
> > This is the start of the stable review cycle for the 6.14.7 release.
> > There are 197 patches in this series, all will be posted as a response
> > to this one.  If anyone has any issues with these being applied, please
> > let me know.
> ...
> > Kees Cook <kees@...nel.org>
> >     mm: vmalloc: support more granular vrealloc() sizing
> 
> The above is causing a slow down in BPF verifier[1]. Assuming BPF
> selftests are somewhat representing of real world BPF programs, the slow
> down would be around 2x on average, but for an unrealistic worth-case it
> could go as high as 40x[2].
> 
> 1: https://lore.kernel.org/stable/20250515041659.smhllyarxdwp7cav@desk/
> 2: https://lore.kernel.org/stable/g4fpslyse2s6hnprgkbp23ykxn67q5wabbkpivuc3rro5bivo4@sj2o3nd5vwwm/

Is this slowdown also in 6.15-rc right now?  If so, let's work on fixing
it there first.

thanks,

greg k-h