On Wed, Jan 27, 2021 at 09:59:14AM -0600, Josh Poimboeuf wrote:
> On Wed, Jan 27, 2021 at 12:27:09PM +0100, Peter Zijlstra wrote:
> > On Wed, Jan 27, 2021 at 10:13:47AM +0100, Peter Zijlstra wrote:
> > > On Tue, Jan 26, 2021 at 05:57:30PM -0600, Josh Poimboeuf wrote:
> >
> > > > Well, I hate it, but I'm not sure I have any better ideas. It should be
> > > > possible to use kallsyms, instead of the rb-tree/register nonsense. Not
> > > > sure about the performance impact though. Might be a good reason to
> > > > speed up kallsyms!
> > >
> > > Oh right, let me see if I can make that work.
> >
> > Something like so compiles.. but it does make the whole thing depend on
> > KALLSYMS_ALL, which is somewhat yuck.
> >
> > Also, kallsyms_lookup_name() is horrible, but not trivial to fix because
> > of that compression scheme used.
>
> The KALLSYMS_ALL dependency doesn't bother me personally but I assume
> some of the tinyconfig folks might not appreciate it being on
> permanently.
I suppose this ought to cure the _ALL thing.
diff --git a/scripts/kallsyms.c b/scripts/kallsyms.c
index 7ecd2ccba531..83586cc4d954 100644
--- a/scripts/kallsyms.c
+++ b/scripts/kallsyms.c
@@ -260,6 +260,12 @@ static int symbol_valid(const struct sym_entry *s)
{
const char *name = sym_name(s);
+ /*
+ * Always emit __SCK__ symbols for static_call_add_module().
+ */
+ if (!strncmp(name, "__SCK__", 7))
+ return 1;
+
/* if --all-symbols is not specified, then symbols outside the text
* and inittext sections are discarded */
if (!all_symbols) {
