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1944a0183c
The core do_mmap() function accepts a vm_flags_t parameter which it then manipulates before passing to mmap_region() to do the heavy lifting of the memory mapping. Update do_mmap() to instead accept a vma_flags_t parameter, and adjust all the logic within do_mmap() to manipulate this instead. This is as part of the ongoing effort to convert VMA flags from a system word size to a bitmap type which allows us to unrestrict the number of VMA flags, as well as gain control over how VMA flag manipulation occurs. We do not cascade these changes to all functions which accept vm_flags_t, but rather use vma_flags_to_legacy() where necessary, specifically deferring converting calc_vm_prot_bits(), calc_vm_flag_bits() and __get_unmapped_area() to vma_flags_t. Also utilise the new vma_flags_can_grow() predicate which correctly handles the case of architectures without upward growing stacks. As part of this change, introduce VMA_SHADOW_STACK so we can correctly handle the case of the shadow stack not being defined. No functional change intended. Link: https://lore.kernel.org/20260711-b4-vma-flags-mm-v2-2-0fa2357d5431@kernel.org Signed-off-by: Lorenzo Stoakes <ljs@kernel.org> Reviewed-by: Lance Yang <lance.yang@linux.dev> Reviewed-by: Zi Yan <ziy@nvidia.com> Reviewed-by: Vlastimil Babka (SUSE) <vbabka@kernel.org> Cc: Baolin Wang <baolin.wang@linux.alibaba.com> Cc: Barry Song <baohua@kernel.org> Cc: Christian Brauner <brauner@kernel.org> Cc: Dave Airlie <airlied@gmail.com> Cc: David Hildenbrand <david@kernel.org> Cc: Dev Jain <dev.jain@arm.com> Cc: Jani Nikula <jani.nikula@intel.com> Cc: Jan Kara <jack@suse.cz> Cc: Jann Horn <jannh@google.com> Cc: Mike Rapoport <rppt@kernel.org> Cc: Muchun Song <muchun.song@linux.dev> Cc: Nico Pache <npache@redhat.com> Cc: Oscar Salvador <osalvador@suse.de> Cc: Pedro Falcato <pfalcato@suse.de> Cc: Suren Baghdasaryan <surenb@google.com> Cc: Thomas Zimmermann <tzimmermann@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> |
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