Greetings, I found a new htmldocs warning on mm-everything: WARNING: kernel-doc './scripts/kernel-doc -rst -enable-lineno -sphinx-version 2.4.4 -internal ./include/linux/mm_types.h' failed with return code 1 Checking the header with './scripts/kernel-doc -v -none ./include/linux/mm_types.h', I got the full error: include/linux/mm_types.h:255: info: Scanning doc for struct encoded_page include/linux/mm_types.h:268: error: Cannot parse struct or union! include/linux/mm_types.h:287: info: Scanning doc for struct folio include/linux/mm_types.h:917: info: Scanning doc for typedef vm_fault_t include/linux/mm_types.h:924: info: Scanning doc for enum vm_fault_reason include/linux/mm_types.h:1028: info: Scanning doc for enum fault_flag 1 errors The culprit is encoded_page struct, which is null struct (nonexistent type) with kernel-doc comments: /** * struct encoded_page - a nonexistent type marking this pointer * * An 'encoded_page' pointer is a pointer to a regular 'struct page', but * with the low bits of the pointer indicating extra context-dependent * information. Not super-common, but happens in mmu_gather and mlock * handling, and this acts as a type system check on that use. * * We only really have two guaranteed bits in general, although you could * play with 'struct page' alignment (see CONFIG_HAVE_ALIGNED_STRUCT_PAGE) * for more. * * Use the supplied helper functions to endcode/decode the pointer and bits. */ struct encoded_page; The struct is introduced by d57ab372568585 ("mm: introduce 'encoded' page pointers with embedded extra bits"). Thanks. -- An old man doll... just what I always wanted! - Clara
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