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Lorenzo Stoakes
4f5b875926
Rather than providing a hook, simplify things by providing the ability to override mmap action errors. This allows us to more carefully validate the value provided and thus ensure only a valid error code is specified, and simplifies the interface. This way, we eliminate all hooks but mmap_prepare and allow only mmap actions to be specified (which core mm controls). This significantly improves robustness and eliminates any unnecessary code duplication in driver mmap hooks. We also update the /dev/mem logic (the only user) to use mmap_action->error_override instead. Link: https://lore.kernel.org/55d13f7d016b827c459946d46a56105635be111c.1780397980.git.ljs@kernel.org Signed-off-by: Lorenzo Stoakes <[email protected]> Acked-by: David Hildenbrand (Arm) <[email protected]> Cc: Arnd Bergmann <[email protected]> Cc: Greg Kroah-Hartman <[email protected]> Cc: Jann Horn <[email protected]> Cc: Liam R. Howlett <[email protected]> Cc: Michal Hocko <[email protected]> Cc: Mike Rapoport <[email protected]> Cc: Pedro Falcato <[email protected]> Cc: Suren Baghdasaryan <[email protected]> Cc: Vlastimil Babka <[email protected]> Signed-off-by: Andrew Morton <[email protected]>