Alessandro Pistocchi <apukbusin...@gmail.com> wrote: > During the syscall I allocate some memory that I want to share between the > kernel and the calling process.
When you get the mapping working, it will not work as well as you like. Compiler re-ordering of writes & reads, caches, write buffers, and other details such as non-TSO will creat problems, meaning you'll need very careful data-structure, and great care with co-dependent fields, otherwise one side can fool the other. That is why the copyin/copyout approach is used as a high-level serializing-forcing primitive in most operating systems. But since you don't show your whole diff.. I suspect this is a waste of time.
