Re: `KSYM_NAME_LEN` strikes again

[John Hubbard]

On 11/30/25 6:16 PM, Miguel Ojeda wrote:
> Hi all,
>
> In some Rust configs with -Os and doctests enabled, we are hitting
> KSYM_NAME_LEN again:
...
> Other options:
>
>    - Conditionally doing it only for those builds that need it, to avoid
>      penalizing other builds (including normal Rust builds).
>
>    - Building the Rust side with -O2 for now, or at least tweaking some
>      of the inlining behavior under -Os.
>
>    - Not supporting Rust for `CC_OPTIMIZE_FOR_SIZE` for now (e.g. under
>      `BROKEN`).
>
>    - Stop all this and go with a hashing approach like Willy/Linus
>      discussed back then:
>
>          https://lore.kernel.org/rust-for-linux/CAHk-=whzXv=Fu7dQshSTyd9H1-JS5=gyKwW-GMNGccAKs4Mwpg@xxxxxxxxxxxxxx/
 
I'm impressed that you listed this last one, because it seems like a
somewhat extensive project!

But if it's actually an option, it seems like a very nice one:
a durable and long-lasting fix.

Maybe we would also get demangled backtraces at runtime as a side
effect, which would remove another minor bit of unhappiness too.
 

thanks,
--
John Hubbard