selftests/mm: remove local __NR_* definitions

This continues the work on getting the selftests to build without
requiring people to first run "make headers" [1].

Now that the system call numbers are in the correct, checked-in locations
in the kernel tree (./tools/include/uapi/asm/unistd*.h), make sure that
the mm selftests include that file (indirectly).

Doing so provides guaranteed definitions at build time, so remove all of
the checks for "ifdef __NR_xxx" in the mm selftests, because they will
always be true (defined).

[1] commit e076eaca5906 ("selftests: break the dependency upon local
header files")

Link: https://lkml.kernel.org/r/[e-mail]
Signed-off-by: John Hubbard <[e-mail]>
Acked-by: David Hildenbrand <[e-mail]>
Cc: Jeff Xu <[e-mail]>
Cc: Andrei Vagin <[e-mail]>
Cc: Axel Rasmussen <[e-mail]>
Cc: Christian Brauner <[e-mail]>
Cc: Kees Cook <[e-mail]>
Cc: Kent Overstreet <[e-mail]>
Cc: Liam R. Howlett <[e-mail]>
Cc: Muhammad Usama Anjum <[e-mail]>
Cc: Peter Xu <[e-mail]>
Cc: Rich Felker <[e-mail]>
Cc: Shuah Khan <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>

tools/testing/selftests/mm/hugepage-mremap.c

···
 #define _GNU_SOURCE
 #include <stdlib.h>
 #include <stdio.h>
-#include <unistd.h>
+#include <asm-generic/unistd.h>
 #include <sys/mman.h>
 #include <errno.h>
 #include <fcntl.h> /* Definition of O_* constants */

tools/testing/selftests/mm/ksm_functional_tests.c

···
 #include <string.h>
 #include <stdbool.h>
 #include <stdint.h>
-#include <unistd.h>
+#include <asm-generic/unistd.h>
 #include <errno.h>
 #include <fcntl.h>
 #include <sys/mman.h>
···
 	munmap(map, size);
 }
 
-#ifdef __NR_userfaultfd
 static void test_unmerge_uffd_wp(void)
 {
 	struct uffdio_writeprotect uffd_writeprotect;
···
 unmap:
 	munmap(map, size);
 }
-#endif
 
 /* Verify that KSM can be enabled / queried with prctl. */
 static void test_prctl(void)
···
 		exit(test_child_ksm());
 	}
 
-#ifdef __NR_userfaultfd
 	tests++;
-#endif
 
 	ksft_print_header();
 	ksft_set_plan(tests);
···
 	test_unmerge();
 	test_unmerge_zero_pages();
 	test_unmerge_discarded();
-#ifdef __NR_userfaultfd
 	test_unmerge_uffd_wp();
-#endif
 
 	test_prot_none();
 

tools/testing/selftests/mm/memfd_secret.c

···
 
 #include <stdlib.h>
 #include <string.h>
-#include <unistd.h>
+#include <asm-generic/unistd.h>
 #include <errno.h>
 #include <stdio.h>
 #include <fcntl.h>
···
 #define fail(fmt, ...) ksft_test_result_fail(fmt, ##__VA_ARGS__)
 #define pass(fmt, ...) ksft_test_result_pass(fmt, ##__VA_ARGS__)
 #define skip(fmt, ...) ksft_test_result_skip(fmt, ##__VA_ARGS__)
-
-#ifdef __NR_memfd_secret
 
 #define PATTERN	0x55
 
···
 
 	ksft_finished();
 }
-
-#else /* __NR_memfd_secret */
-
-int main(int argc, char *argv[])
-{
-	printf("skip: skipping memfd_secret test (missing __NR_memfd_secret)\n");
-	return KSFT_SKIP;
-}
-
-#endif /* __NR_memfd_secret */

tools/testing/selftests/mm/mkdirty.c

···
  */
 #include <fcntl.h>
 #include <signal.h>
-#include <unistd.h>
+#include <asm-generic/unistd.h>
 #include <string.h>
 #include <errno.h>
 #include <stdlib.h>
···
 	munmap(mmap_mem, mmap_size);
 }
 
-#ifdef __NR_userfaultfd
 static void test_uffdio_copy(void)
 {
 	struct uffdio_register uffdio_register;
···
 	munmap(dst, pagesize);
 	free(src);
 }
-#endif /* __NR_userfaultfd */
 
 int main(void)
 {
···
 			       thpsize / 1024);
 		tests += 3;
 	}
-#ifdef __NR_userfaultfd
 	tests += 1;
-#endif /* __NR_userfaultfd */
 
 	ksft_print_header();
 	ksft_set_plan(tests);
···
 	if (thpsize)
 		test_pte_mapped_thp();
 	/* Placing a fresh page via userfaultfd may set the PTE dirty. */
-#ifdef __NR_userfaultfd
 	test_uffdio_copy();
-#endif /* __NR_userfaultfd */
 
 	err = ksft_get_fail_cnt();
 	if (err)

tools/testing/selftests/mm/mlock2.h

···
 #include <errno.h>
 #include <stdio.h>
 #include <stdlib.h>
+#include <asm-generic/unistd.h>
 
 static int mlock2_(void *start, size_t len, int flags)
 {

tools/testing/selftests/mm/pagemap_ioctl.c

···
 #include <sys/ioctl.h>
 #include <sys/stat.h>
 #include <math.h>
-#include <asm/unistd.h>
+#include <asm-generic/unistd.h>
 #include <pthread.h>
 #include <sys/resource.h>
 #include <assert.h>

tools/testing/selftests/mm/protection_keys.c

···
 #include <sys/wait.h>
 #include <sys/stat.h>
 #include <fcntl.h>
-#include <unistd.h>
+#include <asm-generic/unistd.h>
 #include <sys/ptrace.h>
 #include <setjmp.h>
 

tools/testing/selftests/mm/uffd-common.c

···
 
 int uffd_open_sys(unsigned int flags)
 {
-#ifdef __NR_userfaultfd
 	return syscall(__NR_userfaultfd, flags);
-#else
-	return -1;
-#endif
 }
 
 int uffd_open(unsigned int flags)

tools/testing/selftests/mm/uffd-stress.c

···
  * pthread_mutex_lock will also verify the atomicity of the memory
  * transfer (UFFDIO_COPY).
  */
-
+#include <asm-generic/unistd.h>
 #include "uffd-common.h"
-
-#ifdef __NR_userfaultfd
 
 #define BOUNCE_RANDOM		(1<<0)
 #define BOUNCE_RACINGFAULTS	(1<<1)
···
 	       nr_pages, nr_pages_per_cpu);
 	return userfaultfd_stress();
 }
-
-#else /* __NR_userfaultfd */
-
-#warning "missing __NR_userfaultfd definition"
-
-int main(void)
-{
-	printf("skip: Skipping userfaultfd test (missing __NR_userfaultfd)\n");
-	return KSFT_SKIP;
-}
-
-#endif /* __NR_userfaultfd */

tools/testing/selftests/mm/uffd-unit-tests.c

···
  *  Copyright (C) 2015-2023  Red Hat, Inc.
  */
 
+#include <asm-generic/unistd.h>
 #include "uffd-common.h"
 
 #include "../../../../mm/gup_test.h"
-
-#ifdef __NR_userfaultfd
 
 /* The unit test doesn't need a large or random size, make it 32MB for now */
 #define  UFFD_TEST_MEM_SIZE               (32UL << 20)
···
 	return ksft_get_fail_cnt() ? KSFT_FAIL : KSFT_PASS;
 }
 
-#else /* __NR_userfaultfd */
-
-#warning "missing __NR_userfaultfd definition"
-
-int main(void)
-{
-	printf("Skipping %s (missing __NR_userfaultfd)\n", __file__);
-	return KSFT_SKIP;
-}
-
-#endif /* __NR_userfaultfd */