tools/testing/selftests/mm/droppable.c

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

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/mm/droppable.c
Extension
.c
Size
1332 bytes
Lines
61
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 ((errno == EOPNOTSUPP) || (errno == EINVAL)) {
			ksft_test_result_skip("MAP_DROPPABLE not supported\n");
			exit(KSFT_SKIP);
		}
		ksft_test_result_fail("mmap error: %s\n", strerror(errno));
		exit(KSFT_FAIL);
	}
	memset(alloc, 'A', alloc_size);
	for (size_t i = 0; i < alloc_size; i += page_size)
		assert(*(uint8_t *)(alloc + i));

	child = fork();
	assert(child >= 0);
	if (!child) {
		for (;;)
			*(char *)malloc(page_size) = 'B';
	}

	for (bool done = false; !done;) {
		for (size_t i = 0; i < alloc_size; i += page_size) {
			if (!*(uint8_t *)(alloc + i)) {
				done = true;
				break;
			}
		}
	}
	kill(child, SIGTERM);

	ksft_test_result_pass("MAP_DROPPABLE: PASS\n");
	exit(KSFT_PASS);
}

Annotation

Implementation Notes