Re: [PATCH 16/16] kcov: update kcov to use mmap_prepare, mmap_complete

Jason Gunthorpe
2025-09-08T13:30:18Z

On Mon, Sep 08, 2025 at 12:10:47PM +0100, Lorenzo Stoakes wrote:
> Now we have the capacity to set up the VMA in f_op->mmap_prepare and then
> later, once the VMA is established, insert a mixed mapping in
> f_op->mmap_complete, do so for kcov.
>
> We utilise the context desc->mmap_context field to pass context between
> mmap_prepare and mmap_complete to conveniently provide the size over which
> the mapping is performed.

Why?

+ vma_desc_size(desc) != size) {
+ res = -EINVAL;

Just call some vma_size()?

Jason