tools/testing/selftests/mm/uffd-wp-mremap.c

File Facts

System

Linux kernel

Corpus path

tools/testing/selftests/mm/uffd-wp-mremap.c

Extension

.c

Size

8584 bytes

Lines

381

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.

• Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• stdbool.h
• stdint.h
• fcntl.h
• assert.h
• linux/mman.h
• sys/mman.h
• kselftest.h
• thp_settings.h
• uffd-common.h

Detected Declarations

• struct testcase
• function detect_thp_sizes
• function check_uffd_wp_state
• function range_is_swapped
• function test_one_folio
• function main

Annotated Snippet

struct testcase {
	size_t *sizes;
	int *nr_sizes;
	bool private;
	bool swapout;
	bool hugetlb;
};

static const struct testcase testcases[] = {
	/* base pages. */
	{
		.sizes = &pagesize,
		.nr_sizes = &nr_pagesizes,
		.private = false,
		.swapout = false,
		.hugetlb = false,
	},
	{
		.sizes = &pagesize,
		.nr_sizes = &nr_pagesizes,
		.private = true,
		.swapout = false,
		.hugetlb = false,
	},
	{
		.sizes = &pagesize,
		.nr_sizes = &nr_pagesizes,
		.private = false,
		.swapout = true,
		.hugetlb = false,
	},
	{
		.sizes = &pagesize,
		.nr_sizes = &nr_pagesizes,
		.private = true,
		.swapout = true,
		.hugetlb = false,
	},

	/* thp. */
	{
		.sizes = thpsizes,
		.nr_sizes = &nr_thpsizes,
		.private = false,
		.swapout = false,
		.hugetlb = false,
	},
	{
		.sizes = thpsizes,
		.nr_sizes = &nr_thpsizes,
		.private = true,
		.swapout = false,
		.hugetlb = false,
	},
	{
		.sizes = thpsizes,
		.nr_sizes = &nr_thpsizes,
		.private = false,
		.swapout = true,
		.hugetlb = false,
	},
	{
		.sizes = thpsizes,
		.nr_sizes = &nr_thpsizes,
		.private = true,
		.swapout = true,
		.hugetlb = false,
	},

	/* hugetlb. */
	{
		.sizes = hugetlbsizes,
		.nr_sizes = &nr_hugetlbsizes,
		.private = false,
		.swapout = false,
		.hugetlb = true,
	},
	{
		.sizes = hugetlbsizes,
		.nr_sizes = &nr_hugetlbsizes,
		.private = true,
		.swapout = false,
		.hugetlb = true,
	},
};

int main(int argc, char **argv)
{
	uffd_global_test_opts_t gopts = { 0 };
	struct thp_settings settings;

Annotation

• Immediate include surface: `stdbool.h`, `stdint.h`, `fcntl.h`, `assert.h`, `linux/mman.h`, `sys/mman.h`, `kselftest.h`, `thp_settings.h`.
• Detected declarations: `struct testcase`, `function detect_thp_sizes`, `function check_uffd_wp_state`, `function range_is_swapped`, `function test_one_folio`, `function main`.
• Atlas domain: Support Tooling And Documentation / tools.
• Implementation status: source implementation candidate.

Implementation Notes

• This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
• Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
• Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.