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Lorenzo Stoakes (Oracle)
62c65fd740
A user can invoke mmap_action_map_kernel_pages() to specify that the mapping should map kernel pages starting from desc->start of a specified number of pages specified in an array. In order to implement this, adjust mmap_action_prepare() to be able to return an error code, as it makes sense to assert that the specified parameters are valid as quickly as possible as well as updating the VMA flags to include VMA_MIXEDMAP_BIT as necessary. This provides an mmap_prepare equivalent of vm_insert_pages(). We additionally update the existing vm_insert_pages() code to use range_in_vma() and add a new range_in_vma_desc() helper function for the mmap_prepare case, sharing the code between the two in range_is_subset(). We add both mmap_action_map_kernel_pages() and mmap_action_map_kernel_pages_full() to allow for both partial and full VMA mappings. We update the documentation to reflect the new features. Finally, we update the VMA tests accordingly to reflect the changes. Link: https://lkml.kernel.org/r/926ac961690d856e67ec847bee2370ab3c6b9046.1774045440.git.ljs@kernel.org Signed-off-by: Lorenzo Stoakes (Oracle) <[email protected]> Reviewed-by: Suren Baghdasaryan <[email protected]> Acked-by: Vlastimil Babka (SUSE) <[email protected]> Cc: Alexander Shishkin <[email protected]> Cc: Alexandre Torgue <[email protected]> Cc: Al Viro <[email protected]> Cc: Arnd Bergmann <[email protected]> Cc: Bodo Stroesser <[email protected]> Cc: Christian Brauner <[email protected]> Cc: Clemens Ladisch <[email protected]> Cc: David Hildenbrand <[email protected]> Cc: David Howells <[email protected]> Cc: Dexuan Cui <[email protected]> Cc: Greg Kroah-Hartman <[email protected]> Cc: Haiyang Zhang <[email protected]> Cc: Jan Kara <[email protected]> Cc: Jann Horn <[email protected]> Cc: Jonathan Corbet <[email protected]> Cc: K. Y. Srinivasan <[email protected]> Cc: Liam Howlett <[email protected]> Cc: Long Li <[email protected]> Cc: Marc Dionne <[email protected]> Cc: "Martin K. Petersen" <[email protected]> Cc: Maxime Coquelin <[email protected]> Cc: Michal Hocko <[email protected]> Cc: Mike Rapoport <[email protected]> Cc: Miquel Raynal <[email protected]> Cc: Pedro Falcato <[email protected]> Cc: Richard Weinberger <[email protected]> Cc: Ryan Roberts <[email protected]> Cc: Vignesh Raghavendra <[email protected]> Cc: Wei Liu <[email protected]> Signed-off-by: Andrew Morton <[email protected]>