uml: Eliminate kernel allocator wrappers

UML had two wrapper procedures for kmalloc, um_kmalloc and um_kmalloc_atomic
because the flag constants weren't available in userspace code.
kern_constants.h had made kernel constants available for a long time, so there
is no need for these wrappers any more.  Rather, userspace code calls kmalloc
directly with the userspace versions of the gfp flags.

kmalloc isn't a real procedure, so I had to essentially copy the inline
wrapper around __kmalloc.

vmalloc also had its own wrapper for no good reason.  This is now gone.

Signed-off-by: Jeff Dike <jdike@linux.intel.com>
Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/arch/um/drivers/slip_user.c b/arch/um/drivers/slip_user.c
index edc2de3..c0b73c2 100644
--- a/arch/um/drivers/slip_user.c
+++ b/arch/um/drivers/slip_user.c
@@ -91,7 +91,7 @@
 	pid = err;
 
 	output_len = UM_KERN_PAGE_SIZE;
-	output = um_kmalloc(output_len);
+	output = kmalloc(output_len, UM_GFP_KERNEL);
 	if(output == NULL){
 		printk("slip_tramp : failed to allocate output buffer\n");
 		os_kill_process(pid, 1);