Commit f03cd586 authored Feb 26, 2018 by Michael Ellerman Committed by Greg Kroah-Hartman May 30, 2018

selftests/powerpc: Skip the subpage_prot tests if the syscall is unavailable



[ Upstream commit cd4a6f3ab4d80cb919d15897eb3cbc85c2009d4b ]

The subpage_prot syscall is only functional when the system is using
the Hash MMU. Since commit 5b2b80714796 ("powerpc/mm: Invalidate
subpage_prot() system call on radix platforms") it returns ENOENT when
the Radix MMU is active. Currently this just makes the test fail.

Additionally the syscall is not available if the kernel is built with
4K pages, or if CONFIG_PPC_SUBPAGE_PROT=n, in which case it returns
ENOSYS because the syscall is missing entirely.

So check explicitly for ENOENT and ENOSYS and skip if we see either of
those.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

parent 2b103dee

tools/testing/selftests/powerpc/mm/subpage_prot.c

+14 −0

Original line number	Diff line number	Diff line
		@@ -135,6 +135,16 @@ static int run_test(void *addr, unsigned long size)
		return 0;
		}

		static int syscall_available(void)
		{
		int rc;

		errno = 0;
		rc = syscall(__NR_subpage_prot, 0, 0, 0);

		return rc == 0 \|\| (errno != ENOENT && errno != ENOSYS);
		}

		int test_anon(void)
		{
		unsigned long align;
		@@ -145,6 +155,8 @@ int test_anon(void)
		void *mallocblock;
		unsigned long mallocsize;

		SKIP_IF(!syscall_available());

		if (getpagesize() != 0x10000) {
		fprintf(stderr, "Kernel page size must be 64K!\n");
		return 1;
		@@ -180,6 +192,8 @@ int test_file(void)
		off_t filesize;
		int fd;

		SKIP_IF(!syscall_available());

		fd = open(file_name, O_RDWR);
		if (fd == -1) {
		perror("failed to open file");