The patch titled Subject: Revert "selftests/mm: remove local __NR_* definitions" has been added to the -mm mm-hotfixes-unstable branch. Its filename is revert-selftests-mm-remove-local-__nr_-definitions.patch

This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches...

This patch will later appear in the mm-hotfixes-unstable branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's

*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***

The -mm tree is included into linux-next via the mm-everything branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm and is updated there every 2-3 working days

------------------------------------------------------ From: John Hubbard jhubbard@nvidia.com Subject: Revert "selftests/mm: remove local __NR_* definitions" Date: Thu, 13 Feb 2025 19:38:50 -0800

This reverts commit a5c6bc590094a1a73cf6fa3f505e1945d2bf2461.

The general approach described in commit e076eaca5906 ("selftests: break the dependency upon local header files") was taken one step too far here: it should not have been extended to include the syscall numbers. This is because doing so would require per-arch support in tools/include/uapi, and no such support exists.

This revert fixes two separate reports of test failures, from Dave Hansen[1], and Li Wang[2]. An excerpt of Dave's report:

Before this commit (a5c6bc590094a1a73cf6fa3f505e1945d2bf2461) things are fine. But after, I get:

running PKEY tests for unsupported CPU/OS

An excerpt of Li's report:

I just found that mlock2_() return a wrong value in mlock2-test

[1] https://lore.kernel.org/dc585017-6740-4cab-a536-b12b37a7582d@intel.com [2] https://lore.kernel.org/CAEemH2eW=UMu9+turT2jRie7+6ewUazXmA6kL+VBo3cGDGU6RA@...

Link: https://lkml.kernel.org/r/20250214033850.235171-1-jhubbard@nvidia.com Fixes: a5c6bc590094 ("selftests/mm: remove local __NR_* definitions") Signed-off-by: John Hubbard jhubbard@nvidia.com Cc: Dave Hansen dave.hansen@intel.com Cc: Li Wang liwang@redhat.com Cc: David Hildenbrand david@redhat.com Cc: Jeff Xu jeffxu@chromium.org Cc: Andrei Vagin avagin@google.com Cc: Axel Rasmussen axelrasmussen@google.com Cc: Christian Brauner brauner@kernel.org Cc: Kees Cook kees@kernel.org Cc: Kent Overstreet kent.overstreet@linux.dev Cc: Liam R. Howlett Liam.Howlett@oracle.com Cc: Muhammad Usama Anjum usama.anjum@collabora.com Cc: Peter Xu peterx@redhat.com Cc: Rich Felker dalias@libc.org Cc: Shuah Khan shuah@kernel.org Cc: stable@vger.kernel.org Signed-off-by: Andrew Morton akpm@linux-foundation.org ---

tools/testing/selftests/mm/hugepage-mremap.c | 2 - tools/testing/selftests/mm/ksm_functional_tests.c | 8 +++++- tools/testing/selftests/mm/memfd_secret.c | 14 ++++++++++- tools/testing/selftests/mm/mkdirty.c | 8 +++++- tools/testing/selftests/mm/mlock2.h | 1 tools/testing/selftests/mm/protection_keys.c | 2 - tools/testing/selftests/mm/uffd-common.c | 4 +++ tools/testing/selftests/mm/uffd-stress.c | 15 +++++++++++- tools/testing/selftests/mm/uffd-unit-tests.c | 14 ++++++++++- 9 files changed, 60 insertions(+), 8 deletions(-)

--- a/tools/testing/selftests/mm/hugepage-mremap.c~revert-selftests-mm-remove-local-__nr_-definitions +++ a/tools/testing/selftests/mm/hugepage-mremap.c @@ -15,7 +15,7 @@ #define _GNU_SOURCE #include <stdlib.h> #include <stdio.h> -#include <asm-generic/unistd.h> +#include <unistd.h> #include <sys/mman.h> #include <errno.h> #include <fcntl.h> /* Definition of O_* constants */ --- a/tools/testing/selftests/mm/ksm_functional_tests.c~revert-selftests-mm-remove-local-__nr_-definitions +++ a/tools/testing/selftests/mm/ksm_functional_tests.c @@ -11,7 +11,7 @@ #include <string.h> #include <stdbool.h> #include <stdint.h> -#include <asm-generic/unistd.h> +#include <unistd.h> #include <errno.h> #include <fcntl.h> #include <sys/mman.h> @@ -369,6 +369,7 @@ unmap: munmap(map, size); }

+#ifdef __NR_userfaultfd static void test_unmerge_uffd_wp(void) { struct uffdio_writeprotect uffd_writeprotect; @@ -429,6 +430,7 @@ close_uffd: unmap: munmap(map, size); } +#endif

/* Verify that KSM can be enabled / queried with prctl. */ static void test_prctl(void) @@ -684,7 +686,9 @@ int main(int argc, char **argv) exit(test_child_ksm()); }

+#ifdef __NR_userfaultfd tests++; +#endif

ksft_print_header(); ksft_set_plan(tests); @@ -696,7 +700,9 @@ int main(int argc, char **argv) test_unmerge(); test_unmerge_zero_pages(); test_unmerge_discarded(); +#ifdef __NR_userfaultfd test_unmerge_uffd_wp(); +#endif

test_prot_none();

--- a/tools/testing/selftests/mm/memfd_secret.c~revert-selftests-mm-remove-local-__nr_-definitions +++ a/tools/testing/selftests/mm/memfd_secret.c @@ -17,7 +17,7 @@

#include <stdlib.h> #include <string.h> -#include <asm-generic/unistd.h> +#include <unistd.h> #include <errno.h> #include <stdio.h> #include <fcntl.h> @@ -28,6 +28,8 @@ #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

static const int prot = PROT_READ | PROT_WRITE; @@ -332,3 +334,13 @@ int main(int argc, char *argv[])

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 */ --- a/tools/testing/selftests/mm/mkdirty.c~revert-selftests-mm-remove-local-__nr_-definitions +++ a/tools/testing/selftests/mm/mkdirty.c @@ -9,7 +9,7 @@ */ #include <fcntl.h> #include <signal.h> -#include <asm-generic/unistd.h> +#include <unistd.h> #include <string.h> #include <errno.h> #include <stdlib.h> @@ -265,6 +265,7 @@ munmap: munmap(mmap_mem, mmap_size); }

+#ifdef __NR_userfaultfd static void test_uffdio_copy(void) { struct uffdio_register uffdio_register; @@ -322,6 +323,7 @@ munmap: munmap(dst, pagesize); free(src); } +#endif /* __NR_userfaultfd */

int main(void) { @@ -334,7 +336,9 @@ int main(void) thpsize / 1024); tests += 3; } +#ifdef __NR_userfaultfd tests += 1; +#endif /* __NR_userfaultfd */

ksft_print_header(); ksft_set_plan(tests); @@ -364,7 +368,9 @@ int main(void) 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) --- a/tools/testing/selftests/mm/mlock2.h~revert-selftests-mm-remove-local-__nr_-definitions +++ a/tools/testing/selftests/mm/mlock2.h @@ -3,7 +3,6 @@ #include <errno.h> #include <stdio.h> #include <stdlib.h> -#include <asm-generic/unistd.h>

static int mlock2_(void *start, size_t len, int flags) { --- a/tools/testing/selftests/mm/protection_keys.c~revert-selftests-mm-remove-local-__nr_-definitions +++ a/tools/testing/selftests/mm/protection_keys.c @@ -42,7 +42,7 @@ #include <sys/wait.h> #include <sys/stat.h> #include <fcntl.h> -#include <asm-generic/unistd.h> +#include <unistd.h> #include <sys/ptrace.h> #include <setjmp.h>

--- a/tools/testing/selftests/mm/uffd-common.c~revert-selftests-mm-remove-local-__nr_-definitions +++ a/tools/testing/selftests/mm/uffd-common.c @@ -673,7 +673,11 @@ int uffd_open_dev(unsigned int flags)

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) --- a/tools/testing/selftests/mm/uffd-stress.c~revert-selftests-mm-remove-local-__nr_-definitions +++ a/tools/testing/selftests/mm/uffd-stress.c @@ -33,10 +33,11 @@ * pthread_mutex_lock will also verify the atomicity of the memory * transfer (UFFDIO_COPY). */ -#include <asm-generic/unistd.h> + #include "uffd-common.h"

uint64_t features; +#ifdef __NR_userfaultfd

#define BOUNCE_RANDOM (1<<0) #define BOUNCE_RACINGFAULTS (1<<1) @@ -471,3 +472,15 @@ int main(int argc, char **argv) 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 */ --- a/tools/testing/selftests/mm/uffd-unit-tests.c~revert-selftests-mm-remove-local-__nr_-definitions +++ a/tools/testing/selftests/mm/uffd-unit-tests.c @@ -5,11 +5,12 @@ * 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)

@@ -1558,3 +1559,14 @@ int main(int argc, char *argv[]) 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 */ _

Patches currently in -mm which might be from jhubbard@nvidia.com are

revert-selftests-mm-remove-local-__nr_-definitions.patch