Specifying the memory protections

What if you intend to specify certain specific memory protections (a combination of read, write, and execute protections) for the memory pages you allocate? In this case, use the underlying __vmalloc() API (it is exported). Consider the following comment in the kernel source (mm/vmalloc.c):

* For tight control over page level allocator and protection flags
* use __vmalloc() instead.

The signature of the __vmalloc() API shows how we can achieve this:

void *__vmalloc(unsigned long size, gfp_t gfp_mask, pgprot_t prot);