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

Source file repositories/reference/linux-study-clean/tools/testing/selftests/mm/hugepage-mmap.c

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/mm/hugepage-mmap.c
Extension
.c
Size
1696 bytes
Lines
79
Domain
Support Tooling And Documentation
Bucket
tools
Inferred role
Support Tooling And Documentation: implementation source
Status
source implementation candidate

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

if (*(addr + i) != (char)i) {
			ksft_print_msg("Error: Mismatch at %lu\n", i);
			return 1;
		}
	return 0;
}

int main(void)
{
	void *addr;
	int fd, ret;

	ksft_print_header();
	ksft_set_plan(1);

	fd = memfd_create("hugepage-mmap", MFD_HUGETLB);
	if (fd < 0)
		ksft_exit_fail_msg("memfd_create() failed: %s\n", strerror(errno));

	addr = mmap(NULL, LENGTH, PROTECTION, MAP_SHARED, fd, 0);
	if (addr == MAP_FAILED) {
		close(fd);
		ksft_exit_fail_msg("mmap(): %s\n", strerror(errno));
	}

	ksft_print_msg("Returned address is %p\n", addr);
	check_bytes(addr);
	write_bytes(addr);
	ret = read_bytes(addr);

	munmap(addr, LENGTH);
	close(fd);

	ksft_test_result(!ret, "Read same data\n");

	ksft_exit(!ret);
}

Annotation

Implementation Notes