[PATCH v2 20/28] docs: xforms_lists: use CMatch for all identifiers

Mauro Carvalho Chehab
2026-03-12T14:55:01Z

CMatch is lexically correct and replaces only identifiers,
which is exactly where macro transformations happen.

Use it to make the output safer and ensure that all arguments
will be parsed the right way, even on complex cases.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
---
tools/lib/python/kdoc/xforms_lists.py | 159 +++++++++++++-------------
1 file changed, 79 insertions(+), 80 deletions(-)

diff --git a/tools/lib/python/kdoc/xforms_lists.py b/tools/lib/python/kdoc/xforms_lists.py
index 2056572852fd..c3c532c45cdc 100644
--- a/tools/lib/python/kdoc/xforms_lists.py
+++ b/tools/lib/python/kdoc/xforms_lists.py
@@ -7,7 +7,8 @@ import re
from kdoc.kdoc_re import KernRe
from kdoc.c_lex import CMatch

-struct_args_pattern = r'([^,)]+)'
+struct_args_pattern = r"([^,)]+)"
+

class CTransforms:
"""
@@ -18,48 +19,40 @@ class CTransforms:

#: Transforms for structs and unions.
struct_xforms = [
- # Strip attributes
- (KernRe(r"__attribute__\s*\(\([a-z0-9,_\*\s\(\)]*\)\)", flags=re.I | re.S, cache=False), ' '),
- (KernRe(r'\s*__aligned\s*\([^;]*\)', re.S), ' '),
- (KernRe(r'\s*__counted_by\s*\([^;]*\)', re.S), ' '),
- (KernRe(r'\s*__counted_by_(le|be)\s*\([^;]*\)', re.S), ' '),
- (KernRe(r'\s*__guarded_by\s*\([^\)]*\)', re.S), ' '),
- (KernRe(r'\s*__pt_guarded_by\s*\([^\)]*\)', re.S), ' '),
- (KernRe(r'\s*__packed\s*', re.S), ' '),
- (KernRe(r'\s*CRYPTO_MINALIGN_ATTR', re.S), ' '),
- (KernRe(r'\s*__private', re.S), ' '),
- (KernRe(r'\s*__rcu', re.S), ' '),
- (KernRe(r'\s*____cacheline_aligned_in_smp', re.S), ' '),
- (KernRe(r'\s*____cacheline_aligned', re.S), ' '),
- (KernRe(r'\s*__cacheline_group_(begin|end)\([^\)]+\);'), ''),
- (KernRe(r'__ETHTOOL_DECLARE_LINK_MODE_MASK\s*\(([^\)]+)\)', re.S),
- r'DECLARE_BITMAP(\1, __ETHTOOL_LINK_MODE_MASK_NBITS)'),
- (KernRe(r'DECLARE_PHY_INTERFACE_MASK\s*\(([^\)]+)\)', re.S),
- r'DECLARE_BITMAP(\1, PHY_INTERFACE_MODE_MAX)'),
- (KernRe(r'DECLARE_BITMAP\s*\(' + struct_args_pattern + r',\s*' + struct_args_pattern + r'\)',
- re.S), r'unsigned long \1[BITS_TO_LONGS(\2)]'),
- (KernRe(r'DECLARE_HASHTABLE\s*\(' + struct_args_pattern + r',\s*' + struct_args_pattern + r'\)',
- re.S), r'unsigned long \1[1 << ((\2) - 1)]'),
- (KernRe(r'DECLARE_KFIFO\s*\(' + struct_args_pattern + r',\s*' + struct_args_pattern +
- r',\s*' + struct_args_pattern + r'\)', re.S), r'\2 *\1'),
- (KernRe(r'DECLARE_KFIFO_PTR\s*\(' + struct_args_pattern + r',\s*' +
- struct_args_pattern + r'\)', re.S), r'\2 *\1'),
- (KernRe(r'(?:__)?DECLARE_FLEX_ARRAY\s*\(' + struct_args_pattern + r',\s*' +
- struct_args_pattern + r'\)', re.S), r'\1 \2[]'),
- (KernRe(r'DEFINE_DMA_UNMAP_ADDR\s*\(' + struct_args_pattern + r'\)', re.S), r'dma_addr_t \1'),
- (KernRe(r'DEFINE_DMA_UNMAP_LEN\s*\(' + struct_args_pattern + r'\)', re.S), r'__u32 \1'),
- (KernRe(r'VIRTIO_DECLARE_FEATURES\(([\w_]+)\)'), r'union { u64 \1; u64 \1_array[VIRTIO_FEATURES_U64S]; }'),
-
- (CMatch(r"__cond_acquires"), ""),
- (CMatch(r"__cond_releases"), ""),
- (CMatch(r"__acquires"), ""),
- (CMatch(r"__releases"), ""),
- (CMatch(r"__must_hold"), ""),
- (CMatch(r"__must_not_hold"), ""),
- (CMatch(r"__must_hold_shared"), ""),
- (CMatch(r"__cond_acquires_shared"), ""),
- (CMatch(r"__acquires_shared"), ""),
- (CMatch(r"__releases_shared"), ""),
+ (CMatch("__attribute__"), ""),
+ (CMatch("__aligned"), ""),
+ (CMatch("__counted_by"), ""),
+ (CMatch("__counted_by_(le|be)"), ""),
+ (CMatch("__guarded_by"), ""),
+ (CMatch("__pt_guarded_by"), ""),
+ (CMatch("__packed"), ""),
+ (CMatch("CRYPTO_MINALIGN_ATTR"), ""),
+ (CMatch("__private"), ""),
+ (CMatch("__rcu"), ""),
+ (CMatch("____cacheline_aligned_in_smp"), ""),
+ (CMatch("____cacheline_aligned"), ""),
+ (CMatch("__cacheline_group_(?:begin|end)"), ""),
+ (CMatch("__ETHTOOL_DECLARE_LINK_MODE_MASK"), r"DECLARE_BITMAP(\1, __ETHTOOL_LINK_MODE_MASK_NBITS)"),
+ (CMatch("DECLARE_PHY_INTERFACE_MASK",),r"DECLARE_BITMAP(\1, PHY_INTERFACE_MODE_MAX)"),
+ (CMatch("DECLARE_BITMAP"), r"unsigned long \1[BITS_TO_LONGS(\2)]"),
+ (CMatch("DECLARE_HASHTABLE"), r"unsigned long \1[1 << ((\2) - 1)]"),
+ (CMatch("DECLARE_KFIFO"), r"\2 *\1"),
+ (CMatch("DECLARE_KFIFO_PTR"), r"\2 *\1"),
+ (CMatch("(?:__)?DECLARE_FLEX_ARRAY"), r"\1 \2[]"),
+ (CMatch("DEFINE_DMA_UNMAP_ADDR"), r"dma_addr_t \1"),
+ (CMatch("DEFINE_DMA_UNMAP_LEN"), r"__u32 \1"),
+ (CMatch("VIRTIO_DECLARE_FEATURES"), r"union { u64 \1; u64 \1_array[VIRTIO_FEATURES_U64S]; }"),
+ (CMatch("__cond_acquires"), ""),
+ (CMatch("__cond_releases"), ""),
+ (CMatch("__acquires"), ""),
+ (CMatch("__releases"), ""),
+ (CMatch("__must_hold"), ""),
+ (CMatch("__must_not_hold"), ""),
+ (CMatch("__must_hold_shared"), ""),
+ (CMatch("__cond_acquires_shared"), ""),
+ (CMatch("__acquires_shared"), ""),
+ (CMatch("__releases_shared"), ""),
+ (CMatch("__attribute__"), ""),

#
# Macro __struct_group() creates an union with an anonymous
@@ -67,51 +60,57 @@ class CTransforms:
# need one of those at kernel-doc, as we won't be documenting the same
# members twice.
#
- (CMatch('struct_group'), r'struct { \2+ };'),
- (CMatch('struct_group_attr'), r'struct { \3+ };'),
- (CMatch('struct_group_tagged'), r'struct { \3+ };'),
- (CMatch('__struct_group'), r'struct { \4+ };'),
-
+ (CMatch("struct_group"), r"struct { \2+ };"),
+ (CMatch("struct_group_attr"), r"struct { \3+ };"),
+ (CMatch("struct_group_tagged"), r"struct { \3+ };"),
+ (CMatch("__struct_group"), r"struct { \4+ };"),
]

#: Transforms for function prototypes.
function_xforms = [
- (KernRe(r"^static +"), ""),
- (KernRe(r"^extern +"), ""),
- (KernRe(r"^asmlinkage +"), ""),
- (KernRe(r"^inline +"), ""),
- (KernRe(r"^__inline__ +"), ""),
- (KernRe(r"^__inline +"), ""),
- (KernRe(r"^__always_inline +"), ""),
- (KernRe(r"^noinline +"), ""),
- (KernRe(r"^__FORTIFY_INLINE +"), ""),
- (KernRe(r"__init +"), ""),
- (KernRe(r"__init_or_module +"), ""),
- (KernRe(r"__exit +"), ""),
- (KernRe(r"__deprecated +"), ""),
- (KernRe(r"__flatten +"), ""),
- (KernRe(r"__meminit +"), ""),
- (KernRe(r"__must_check +"), ""),
- (KernRe(r"__weak +"), ""),
- (KernRe(r"__sched +"), ""),
- (KernRe(r"_noprof"), ""),
- (KernRe(r"__always_unused *"), ""),
- (KernRe(r"__printf\s*\(\s*\d*\s*,\s*\d*\s*\) +"), ""),
- (KernRe(r"__(?:re)?alloc_size\s*\(\s*\d+\s*(?:,\s*\d+\s*)?\) +"), ""),
- (KernRe(r"__diagnose_as\s*\(\s*\S+\s*(?:,\s*\d+\s*)*\) +"), ""),
- (KernRe(r"DECL_BUCKET_PARAMS\s*\(\s*(\S+)\s*,\s*(\S+)\s*\)"), r"\1, \2"),
- (KernRe(r"__no_context_analysis\s*"), ""),
- (KernRe(r"__attribute_const__ +"), ""),
- (KernRe(r"__attribute__\s*\(\((?:[\w\s]+(?:\([^)]*\))?\s*,?)+\)\)\s+"), ""),
+ (CMatch("static"), ""),
+ (CMatch("extern"), ""),
+ (CMatch("asmlinkage"), ""),
+ (CMatch("inline"), ""),
+ (CMatch("__inline__"), ""),
+ (CMatch("__inline"), ""),
+ (CMatch("__always_inline"), ""),
+ (CMatch("noinline"), ""),
+ (CMatch("__FORTIFY_INLINE"), ""),
+ (CMatch("__init"), ""),
+ (CMatch("__init_or_module"), ""),
+ (CMatch("__exit"), ""),
+ (CMatch("__deprecated"), ""),
+ (CMatch("__flatten"), ""),
+ (CMatch("__meminit"), ""),
+ (CMatch("__must_check"), ""),
+ (CMatch("__weak"), ""),
+ (CMatch("__sched"), ""),
+ (CMatch("__always_unused"), ""),
+ (CMatch("__printf"), ""),
+ (CMatch("__(?:re)?alloc_size"), ""),
+ (CMatch("__diagnose_as"), ""),
+ (CMatch("DECL_BUCKET_PARAMS"), r"\1, \2"),
+ (CMatch("__no_context_analysis"), ""),
+ (CMatch("__attribute_const__"), ""),
+ (CMatch("__attribute__"), ""),
+
+ #
+ # HACK: this is similar to process_export() hack. It is meant to
+ # drop _noproof from function name. See for instance:
+ # ahash_request_alloc kernel-doc declaration at include/crypto/hash.h.
+ #
+ (KernRe("_noprof"), ""),
]

#: Transforms for variable prototypes.
var_xforms = [
- (KernRe(r"__read_mostly"), ""),
- (KernRe(r"__ro_after_init"), ""),
- (KernRe(r'\s*__guarded_by\s*\([^\)]*\)', re.S), ""),
- (KernRe(r'\s*__pt_guarded_by\s*\([^\)]*\)', re.S), ""),
- (KernRe(r"LIST_HEAD\(([\w_]+)\)"), r"struct list_head \1"),
+ (CMatch("__read_mostly"), ""),
+ (CMatch("__ro_after_init"), ""),
+ (CMatch("__guarded_by"), ""),
+ (CMatch("__pt_guarded_by"), ""),
+ (CMatch("LIST_HEAD"), r"struct list_head \1"),
+
(KernRe(r"(?://.*)$"), ""),
(KernRe(r"(?:/\*.*\*/)"), ""),
(KernRe(r";$"), ""),
--
2.52.0