scripts/coccinelle/misc/flexible_array.cocci

File Facts

System

Linux kernel

Corpus path

scripts/coccinelle/misc/flexible_array.cocci

Extension

.cocci

Size

1821 bytes

Lines

108

Domain

Support Tooling And Documentation

Bucket

scripts

Inferred role

Support Tooling And Documentation: scripts

Status

atlas-only

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

• No C-style include directives detected by the generator.

Detected Declarations

• struct name
• struct name
• struct name

Annotated Snippet

struct name {
    ...
*   T array@p[\(0\|1\)];
  };
|
  struct {
    ...
*   T array@p[\(0\|1\)];
  };
|
  union name {
    ...
*   T array@p[\(0\|1\)];
  };
|
  union {
    ...
*   T array@p[\(0\|1\)];
  };
)

@only_field depends on patch@
identifier name, array;
type T;
position q;
@@

(
  struct name {@q
    T array[0];
  };
|
  struct {@q
    T array[0];
  };
)

@depends on patch@
identifier name, array;
type T;
position p : script:python() { relevant(p) };
// position @q with rule "only_field" simplifies
// handling of bitfields, arrays, etc.
position q != only_field.q;
@@

(
  struct name {@q
    ...
    T array@p[
-       0
    ];
  };
|
  struct {@q
    ...
    T array@p[
-       0
    ];
  };
)

@script: python depends on report@
p << r.p;
@@

msg = "WARNING use flexible-array member instead (https://www.kernel.org/doc/html/latest/process/deprecated.html#zero-length-and-one-element-arrays)"
coccilib.report.print_report(p[0], msg)

@script: python depends on org@

Annotation

• Detected declarations: `struct name`, `struct name`, `struct name`.
• Atlas domain: Support Tooling And Documentation / scripts.
• Implementation status: atlas-only.

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.