VM_MAP_RAM(9)                       Memory Management in Linux                      VM_MAP_RAM(9)



NAME
       vm_map_ram - map pages linearly into kernel virtual address (vmalloc space)

SYNOPSIS
       void * vm_map_ram(struct page ** pages, unsigned int count, int node, pgprot_t prot);

ARGUMENTS
       pages
           an array of pointers to the pages to be mapped

       count
           number of pages

       node
           prefer to allocate data structures on this node

       prot
           memory protection to use. PAGE_KERNEL for regular RAM

DESCRIPTION
       If you use this function for less than VMAP_MAX_ALLOC pages, it could be faster than vmap
       so it's good. But if you mix long-life and short-life objects with vm_map_ram, it could
       consume lots of address space through fragmentation (especially on a 32bit machine). You
       could see failures in the end. Please use this function for short-lived objects.

RETURN
       a pointer to the address that has been mapped, or NULL on failure

COPYRIGHT
Kernel Hackers Manual 4.8.                 January 2017                             VM_MAP_RAM(9)