Re: [PATCH v6 4/6] selftests/mm/vm_util: robust write_file()

[Andrew Morton]

On Tue, 24 Mar 2026 09:33:14 +0800 Chunyu Hu <chuhu@xxxxxxxxxx> wrote:

> Add two more checks for buflen and numwritten. The buflen should be at
> least one, otherwise the 'buflen - 1' could underflow and cause trouble.
> The numwritten should be equal to 'buflen - 1'. The test will exit if
> any of these conditions aren't met.
> 
> Additionally, add more print information when a write failure occurs or
> a truncated write happens, providing clearer diagnostics.

This one has no review and AI review did identify a kinda-bug.  Maybe
nobody calls write_file() with buflen==1, but still worth addressing I
think.

https://sashiko.dev/#/patchset/20260324013316.2590422-1-chuhu%40redhat.com

Chunyu, could you please take a look?

Thanks.