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

[Shung-Hsi Yu]

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@xxxxxxxx>