vm_map_ram9
Map pages linearly into kernel virtual address (vmalloc space)
Usage
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
Overview
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
Releases
4 releases since Debian 6.0 (Squeeze); the text changed 3 times.