[PATCH v7 1/3] modules: Support extended MODVERSIONS info

[Matthew Maurer]

> Sorry I realise it's version 7, but although the above looks correct it's
> kind of dense.
>
> I think the below would also work and is (I think) easier to follow, and
> is more obviously similar to the existing code. I'm sure your version is
> faster, but I don't think it's that performance critical.
>
> static void dedotify_ext_version_names(char *str_seq, unsigned long size)
> {
>         char *end = str_seq + size;
>         char *p = str_seq;
>
>         while (p < end) {
>                 if (*p == '.')
>                         memmove(p, p + 1, end - p - 1);
>
>                 p += strlen(p) + 1;
>         }
> }
>
> The tail of str_seq will be filled with nulls as long as the last string
> was null terminated.
>
> cheers

As you alluded to, what you're providing is potentially O(n^2) in the
number of symbols a module depends on - the existing code is O(n).
If leading dots on names are rare, this is probably fine. If they're
common, this will potentially make loading modules with a large number
of imported symbols actually take a measurable amount of additional
time.

That said, I take your point about complexity, and trust you to know
your arch's inputs/requirements, so if I don't hear back again I will
incorporate that into the next revision of the patch (to be produced
after the gendwarfksyms update comes out).