Re: [PATCH 02/17] kallsyms: increase maximum kernel symbol length to 512

Eric W. Biederman
2021-07-14T20:09:16Z

Linus Torvalds <torvalds@linux-foundation.org> writes:

> On Wed, Jul 14, 2021 at 11:20 AM Nick Desaulniers
> <ndesaulniers@google.com> wrote:
>>
>> Do we demangle rust symbols when printing a trace from a warn/panic?
>> That would be nice.
>
> I think it would be pretty much required. Otherwise stack traces are
> going to be very very painful.
>
> In fact, I'm starting to think that Willy is right: we should use
> hashes for the "real" symbol name, and have demangled names for
> printing, and at no point would the kernel actually want or need to
> have the nasty mangled names.
>
> (This wouldn't be rust-specific - using hashes for module linking
> sounds like a good diea for C code as well, even if the de-mangled
> names for printing are then the regular ones)
>
> Anybody interested in looking into that? It would make this "big
> kernel symbols" patch immaterial.

Are you thinking the hashed kernel symbols need to have their types
included in the hash? Or is this just a hash to make the names a
managable size?

Eric