On Thu, 3 Jul 2025 13:58:17 -0700
Linus Torvalds [off-list ref] wrote:
So the reason I dislike the HAVE_xyz pattern is exactly that there
_isn't_ a pattern. When there are fifteen different patterns, it's not
a pattern at all.
That said, maybe it's better to have one place that has that "if
FUNCTION_TRACER, even if I despise the nonsensical "helper
indirection" just because of the random naming.
At least with HAVE_FTRACE_* there is a pattern. The HAVE_* may not be
consistent across other parts of the kernel, but it has been with ftrace.
As I have stated, ftrace is very tightly coupled with the architectures due
to the assembly written trampolines. And having a simple way for the
architectures to denote what it supports and what it does not makes the
generic code much simpler to implement.
-- Steve