mm: move hugepage test examples to tools/testing/selftests/vm

hugepage-mmap.c, hugepage-shm.c and map_hugetlb.c in Documentation/vm are
simple pass/fail tests, It's better to promote them to
tools/testing/selftests.

Thanks suggestion of Andrew Morton about this.  They all need firstly
setting up proper nr_hugepages and hugepage-mmap need to mount hugetlbfs.
So I add a shell script run_vmtests to do such work which will call the
three test programs and check the return value of them.

Changes to original code including below:
a. add run_vmtests script
b. return error when read_bytes mismatch with writed bytes.
c. coding style fixes: do not use assignment in if condition

[akpm@linux-foundation.org: build the targets before trying to execute them]
[akpm@linux-foundation.org: Documentation/vm/ no longer has a Makefile. Fixes "make clean"]
Signed-off-by: Dave Young <dyoung@redhat.com>
Cc: Wu Fengguang <fengguang.wu@intel.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Pekka Enberg <penberg@cs.helsinki.fi>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 0 insertions, 91 deletions

diff --git a/Documentation/vm/hugepage-mmap.c b/Documentation/vm/hugepage-mmap.c
deleted file mode 100644
index db0dd9a33d54..000000000000
--- a/Documentation/vm/hugepage-mmap.c
+++ /dev/null
@@ -1,91 +0,0 @@
-/*
- * hugepage-mmap:
- *
- * Example of using huge page memory in a user application using the mmap
- * system call.  Before running this application, make sure that the
- * administrator has mounted the hugetlbfs filesystem (on some directory
- * like /mnt) using the command mount -t hugetlbfs nodev /mnt. In this
- * example, the app is requesting memory of size 256MB that is backed by
- * huge pages.
- *
- * For the ia64 architecture, the Linux kernel reserves Region number 4 for
- * huge pages.  That means that if one requires a fixed address, a huge page
- * aligned address starting with 0x800000... will be required.  If a fixed
- * address is not required, the kernel will select an address in the proper
- * range.
- * Other architectures, such as ppc64, i386 or x86_64 are not so constrained.
- */
-
-#include <stdlib.h>
-#include <stdio.h>
-#include <unistd.h>
-#include <sys/mman.h>
-#include <fcntl.h>
-
-#define FILE_NAME "/mnt/hugepagefile"
-#define LENGTH (256UL*1024*1024)
-#define PROTECTION (PROT_READ | PROT_WRITE)
-
-/* Only ia64 requires this */
-#ifdef __ia64__
-#define ADDR (void *)(0x8000000000000000UL)
-#define FLAGS (MAP_SHARED | MAP_FIXED)
-#else
-#define ADDR (void *)(0x0UL)
-#define FLAGS (MAP_SHARED)
-#endif
-
-static void check_bytes(char *addr)
-{
-	printf("First hex is %x\n", *((unsigned int *)addr));
-}
-
-static void write_bytes(char *addr)
-{
-	unsigned long i;
-
-	for (i = 0; i < LENGTH; i++)
-		*(addr + i) = (char)i;
-}
-
-static void read_bytes(char *addr)
-{
-	unsigned long i;
-
-	check_bytes(addr);
-	for (i = 0; i < LENGTH; i++)
-		if (*(addr + i) != (char)i) {
-			printf("Mismatch at %lu\n", i);
-			break;
-		}
-}
-
-int main(void)
-{
-	void *addr;
-	int fd;
-
-	fd = open(FILE_NAME, O_CREAT | O_RDWR, 0755);
-	if (fd < 0) {
-		perror("Open failed");
-		exit(1);
-	}
-
-	addr = mmap(ADDR, LENGTH, PROTECTION, FLAGS, fd, 0);
-	if (addr == MAP_FAILED) {
-		perror("mmap");
-		unlink(FILE_NAME);
-		exit(1);
-	}
-
-	printf("Returned address is %p\n", addr);
-	check_bytes(addr);
-	write_bytes(addr);
-	read_bytes(addr);
-
-	munmap(addr, LENGTH);
-	close(fd);
-	unlink(FILE_NAME);
-
-	return 0;
-}