Re: [PATCH] ftrace: Avoid quadratic symbol lookups in ftrace_module_enable()

[Lawrence Lin]

On Sun, 4 Oct 2026 10:00:30 +0100, David Laight wrote:
> Surely it would be better to add the sorted index as part of module load
> so that all symbol lookups could make use of it?

A sorted index used by every lookup is roughly what [1] tried, and its
review showed what that involves: aliases, livepatch's references into
the symbol table, and the lookups by name. I'd rather leave that to the
module maintainers.

For this problem, Steve's reply suggests something smaller. The weak
locations can be dropped once at module load, so ftrace no longer looks
up symbols per record, and no index is needed. I'm prototyping that now.