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Thu, 11 Sep 2025 22:07:26 +0000 Message-ID: Date: Thu, 11 Sep 2025 15:07:21 -0700 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 08/16] mm: add ability to take further action in vm_area_desc To: Lorenzo Stoakes , Andrew Morton CC: Jonathan Corbet , Matthew Wilcox , Guo Ren , Thomas Bogendoerfer , Heiko Carstens , Vasily Gorbik , Alexander Gordeev , Christian Borntraeger , Sven Schnelle , "David S . 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> #endif > > +/* What action should be taken after an .mmap_prepare call is complete? */ > +enum mmap_action_type { > + MMAP_NOTHING, /* Mapping is complete, no further action. */ > + MMAP_REMAP_PFN, /* Remap PFN range based on desc->remap. */ > + MMAP_INSERT_MIXED, /* Mixed map based on desc->mixedmap. */ > + MMAP_INSERT_MIXED_PAGES, /* Mixed map based on desc->mixedmap_pages. */ > + MMAP_CUSTOM_ACTION, /* User-provided hook. */ > +}; > + > +struct mmap_action { > + union { > + /* Remap range. */ > + struct { > + unsigned long addr; > + unsigned long pfn; > + unsigned long size; > + pgprot_t pgprot; > + } remap; > + /* Insert mixed map. */ > + struct { > + unsigned long addr; > + unsigned long pfn; > + unsigned long num_pages; > + } mixedmap; > + /* Insert specific mixed map pages. */ > + struct { > + unsigned long addr; > + struct page **pages; > + unsigned long num_pages; > + /* kfree pages on completion? */ > + bool kfree_pages :1; > + } mixedmap_pages; > + struct { > + int (*action_hook)(struct vm_area_struct *vma); > + } custom; > + }; > + enum mmap_action_type type; > + > + /* > + * If specified, this hook is invoked after the selected action has been > + * successfully completed. Not that the VMA write lock still held. A typo that may trip tired eyes: Not -> Note ? (perhaps also "is still held"?) (also in the duplicate changes to tools/testing/vma/vma_internal.h) > + * > + * The absolute minimum ought to be done here. > + * > + * Returns 0 on success, or an error code. > + */ > + int (*success_hook)(struct vm_area_struct *vma); > + > + /* > + * If specified, this hook is invoked when an error occurred when > + * attempting the selection action. > + * > + * The hook can return an error code in order to filter the error, but > + * it is not valid to clear the error here. > + */ > + int (*error_hook)(int err); > +}; Reinette