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SubjectRe: [PATCH RFC] kprobes: Remove MODULES dependency
On Fri, Jul 10, 2020 at 01:32:38PM +0200, Peter Zijlstra wrote:
> On Fri, Jul 10, 2020 at 07:32:57PM +0900, Masami Hiramatsu wrote:
> > > - page = module_alloc(PAGE_SIZE);
> > > + page = vmalloc(PAGE_SIZE);
> >
> > No, you can not use vmalloc here. The reason why we use module_alloc()
> > is to allocate the executable memory for trampoline code.
> > So, you need to use vmalloc_exec() instead.
>
> vmalloc_exec() would be broken too, also hch recently got rid of that
> thing.
>
> module_alloc() really is the only sane choice here.
>
> We should make module_alloc() unconditionally available, and maybe even
> rename it to text_alloc().

I think unconitionally might be a bit too much, but for
MODULES || KRPOBES or a new symbol select by them makes sense. As does
the rename.

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