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Patch series "mm/vma: convert vm_flags_t to vma_flags_t in vma code", v4. This series converts a lot of the existing use of the legacy vm_flags_t data type to the new vma_flags_t type which replaces it. In order to do so it adds a number of additional helpers: * vma_flags_empty() - Determines whether a vma_flags_t value has no bits set. * vma_flags_and() - Performs a bitwise AND between two vma_flags_t values. * vma_flags_diff_pair() - Determines which flags are not shared between a pair of VMA flags (typically non-constant values) * append_vma_flags() - Similar to mk_vma_flags(), but allows a vma_flags_t value to be specified (typically a constant value) which will be copied and appended to to create a new vma_flags_t value, with additional flags specified to append to it. * vma_flags_same() - Determines if a vma_flags_t value is exactly equal to a set of VMA flags. * vma_flags_same_mask() - Determines if a vma_flags_t value is eactly equal to another vma_flags_t value (typically constant). * vma_flags_same_pair() - Determines if a pair of vma_flags_t values are exactly equal to one another (typically both non-constant). * vma_flags_to_legacy() - Converts a vma_flags_t value to a vm_flags_t value, used to enable more iterative introduction of the use of vma_flags_t. * legacy_to_vma_flags() - Converts a vm_flags_t value to a vma_flags-t value, for the same purpose. * vma_flags_test_single_mask() - Tests whether a vma_flags_t value contain the single flag specified in an input vma_flags_t flag mask, or if that flag mask is empty, is defined to return false. Useful for config-predicated VMA flag mask defines. * vma_test() - Tests whether a VMA's flags contain a specific singular VMA flag. * vma_test_any() - Tests whether a VMA's flags contain any of a set of VMA flags. * vma_test_any_mask() - Tests whether a VMA's flags contain any of the flags specified in another, typically constant, vma_flags_t value. * vma_test_single_mask() - Tests whether a VMA's flags contain the single flag specified in an input vma_flags_t flag mask, or if that flag mask is empty, is defined to return false. Useful for config-predicated VMA flag mask defines. * vma_clear_flags() - Clears a specific set of VMA flags from a vma_flags_t value. * vma_clear_flags_mask() - Clears those flag set in a vma_flags_t value (typically constant) from a (typically not constant) vma_flags_t value. The series mostly focuses on the the VMA specific code, especially that contained in mm/vma.c and mm/vma.h. It updates both brk() and mmap() logic to utils vma_flags_t values as much as is practiaclly possible at this point, changing surrounding logic to be able to do so. It also updates the vma_modify_xxx() functions where they interact with VMA flags directly to use vm_flags_t values where possible. There is extensive testing added in the VMA userland tests to assert that all of these new VMA flag functions work correctly. This patch (of 25): Firstly, add the ability to determine if VMA flags are empty, that is no flags are set in a vma_flags_t value. Next, add the ability to obtain the equivalent of the bitwise and of two vma_flags_t values, via vma_flags_and_mask(). Next, add the ability to obtain the difference between two sets of VMA flags, that is the equivalent to the exclusive bitwise OR of the two sets of flags, via vma_flags_diff_pair(). vma_flags_xxx_mask() typically operates on a pointer to a vma_flags_t value, which is assumed to be an lvalue of some kind (such as a field in a struct or a stack variable) and an rvalue of some kind (typically a constant set of VMA flags obtained e.g. via mk_vma_flags() or equivalent). However vma_flags_diff_pair() is intended to operate on two lvalues, so use the _pair() suffix to make this clear. Finally, update VMA userland tests to add these helpers. We also port bitmap_xor() and __bitmap_xor() to the tools/ headers and source to allow the tests to work with vma_flags_diff_pair(). Link: https://lkml.kernel.org/r/cover.1774034900.git.ljs@kernel.org Link: https://lkml.kernel.org/r/53ab55b7da91425775e42c03177498ad6de88ef4.1774034900.git.ljs@kernel.org Signed-off-by: Lorenzo Stoakes (Oracle) <ljs@kernel.org> Acked-by: Vlastimil Babka (SUSE) <vbabka@kernel.org> Cc: Albert Ou <aou@eecs.berkeley.edu> Cc: Alexander Gordeev <agordeev@linux.ibm.com> Cc: Alexandre Ghiti <alex@ghiti.fr> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Anton Ivanov <anton.ivanov@cambridgegreys.com> Cc: "Borislav Petkov (AMD)" <bp@alien8.de> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Chengming Zhou <chengming.zhou@linux.dev> Cc: Christian Borntraeger <borntraeger@linux.ibm.com> Cc: Christian Brauner <brauner@kernel.org> Cc: David Hildenbrand <david@kernel.org> Cc: Dinh Nguyen <dinguyen@kernel.org> Cc: Heiko Carstens <hca@linux.ibm.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Huacai Chen <chenhuacai@kernel.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Jan Kara <jack@suse.cz> Cc: Jann Horn <jannh@google.com> Cc: Johannes Berg <johannes@sipsolutions.net> Cc: Kees Cook <kees@kernel.org> Cc: Liam Howlett <liam.howlett@oracle.com> Cc: Madhavan Srinivasan <maddy@linux.ibm.com> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Michal Hocko <mhocko@suse.com> Cc: Mike Rapoport <rppt@kernel.org> Cc: Nicholas Piggin <npiggin@gmail.com> Cc: Ondrej Mosnacek <omosnace@redhat.com> Cc: Palmer Dabbelt <palmer@dabbelt.com> Cc: Paul Moore <paul@paul-moore.com> Cc: Pedro Falcato <pfalcato@suse.de> Cc: Richard Weinberger <richard@nod.at> Cc: Russell King <linux@armlinux.org.uk> Cc: Stephen Smalley <stephen.smalley.work@gmail.com> Cc: Suren Baghdasaryan <surenb@google.com> Cc: Sven Schnelle <svens@linux.ibm.com> Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de> Cc: Vasily Gorbik <gor@linux.ibm.com> Cc: Vineet Gupta <vgupta@kernel.org> Cc: WANG Xuerui <kernel@xen0n.name> Cc: Will Deacon <will@kernel.org> Cc: xu xin <xu.xin16@zte.com.cn> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> |
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