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Howlett" , Vlastimil Babka , Jann Horn , Pedro Falcato , Mike Rapoport , Suren Baghdasaryan , Kees Cook , linux-mm@kvack.org, linux-kernel@vger.kernel.org, Vineet Gupta , Russell King , Catalin Marinas , Will Deacon , Brian Cain , Huacai Chen , WANG Xuerui , Thomas Bogendoerfer , Dinh Nguyen , Madhavan Srinivasan , Michael Ellerman , Nicholas Piggin , Christophe Leroy , Paul Walmsley , Palmer Dabbelt , Albert Ou , Alexandre Ghiti , Heiko Carstens , Vasily Gorbik , Alexander Gordeev , Christian Borntraeger , Sven Schnelle , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H . Peter Anvin" , Richard Weinberger , Anton Ivanov , Johannes Berg , Alexander Viro , Christian Brauner , Jan Kara , Xu Xin , Chengming Zhou , Michal Hocko , Paul Moore , Stephen Smalley , Ondrej Mosnacek , linux-snps-arc@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-hexagon@vger.kernel.org, loongarch@lists.linux.dev, linux-mips@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-um@lists.infradead.org, linux-fsdevel@vger.kernel.org, selinux@vger.kernel.org Subject: [PATCH 10/20] mm/vma: introduce vma_flags_same[_mask/_pair]() Date: Thu, 12 Mar 2026 19:16:08 +0000 Message-ID: <64129ea327a7280732291e3481f1fd138aaf4caa.1773342102.git.ljs@kernel.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: 9643A1C000A X-Stat-Signature: iuysbmczb4qdqyqwbfufqbyttodzg1q1 X-Rspam-User: X-HE-Tag: 1773343019-459393 X-HE-Meta: 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 YRoo+7NC UlL+NZzTWQmf/lK39XUyd4SoTn4QDysEQHAjzMxFr8ip3LWBSivHcNPpIGZapHzALGSXj7xYb4Cvpe9FGhvrwP8jzeRY/TR/37xQtS+2eLYqA22wAE5JQJkKvyVxjzuv64ZTFgvZQSAA2B4XwWLea74RlVOsmNV9cp+E/s0tf5aK/UIRXR4T+/1uHeRHfFcqAWYpukUMzd0+JH5hWkZQFY4YZifO6UU4iK99PjoTImltzZHDzboPv/THRFdAHgOAEFCOxnIa+r3yTW6fNY9uIdhp4kRJHADPHyrl9RNGds58GszmpbPZOikWaSkDLjxJz5+FHCT52s22oTIVXTnXIbrSIgQdpW1RIyzOU Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Add helpers to determine if two sets of VMA flags are precisely the same, that is - that every flag set one is set in another, and neither contain any flags not set in the other. We also introduce vma_flags_same_pair() for cases where we want to compare two sets of VMA flags which are both non-const values. Also update the VMA tests to reflect the change, we already implicitly test that this functions correctly having used it for testing purposes previously. Signed-off-by: Lorenzo Stoakes (Oracle) --- include/linux/mm.h | 28 ++++++++++++++++++++++++++++ tools/testing/vma/include/custom.h | 12 ------------ tools/testing/vma/include/dup.h | 21 +++++++++++++++++++++ 3 files changed, 49 insertions(+), 12 deletions(-) diff --git a/include/linux/mm.h b/include/linux/mm.h index 2c16c744d49d..33d0c2af2c75 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -1209,6 +1209,34 @@ static __always_inline vma_flags_t vma_flags_diff_pair(const vma_flags_t *flags, return dst; } +/* Determine if flags and flags_other have precisely the same flags set. */ +static __always_inline bool vma_flags_same_pair(const vma_flags_t *flags, + const vma_flags_t *flags_other) +{ + const unsigned long *bitmap = flags->__vma_flags; + const unsigned long *bitmap_other = flags_other->__vma_flags; + + return bitmap_equal(bitmap, bitmap_other, NUM_VMA_FLAG_BITS); +} + +/* Determine if flags and flags_other have precisely the same flags set. */ +static __always_inline bool vma_flags_same_mask(const vma_flags_t *flags, + vma_flags_t flags_other) +{ + const unsigned long *bitmap = flags->__vma_flags; + const unsigned long *bitmap_other = flags_other.__vma_flags; + + return bitmap_equal(bitmap, bitmap_other, NUM_VMA_FLAG_BITS); +} + +/* + * Helper macro to determine if only the specific flags are set, e.g.: + * + * if (vma_flags_same(&flags, VMA_WRITE_BIT) { ... } + */ +#define vma_flags_same(flags, ...) \ + vma_flags_same_mask(flags, mk_vma_flags(__VA_ARGS__)) + /* * Helper to test that ALL specified flags are set in a VMA. * diff --git a/tools/testing/vma/include/custom.h b/tools/testing/vma/include/custom.h index 433b3396c281..92fe156ed7d6 100644 --- a/tools/testing/vma/include/custom.h +++ b/tools/testing/vma/include/custom.h @@ -99,17 +99,5 @@ static inline void vma_lock_init(struct vm_area_struct *vma, bool reset_refcnt) if (reset_refcnt) refcount_set(&vma->vm_refcnt, 0); } - -/* Place here until needed in the kernel code. */ -static __always_inline bool vma_flags_same_mask(vma_flags_t *flags, - vma_flags_t flags_other) -{ - const unsigned long *bitmap = flags->__vma_flags; - const unsigned long *bitmap_other = flags_other.__vma_flags; - - return bitmap_equal(bitmap, bitmap_other, NUM_VMA_FLAG_BITS); -} -#define vma_flags_same(flags, ...) \ - vma_flags_same_mask(flags, mk_vma_flags(__VA_ARGS__)) #define VMA_SPECIAL_FLAGS mk_vma_flags(VMA_IO_BIT, VMA_DONTEXPAND_BIT, \ VMA_PFNMAP_BIT, VMA_MIXEDMAP_BIT) diff --git a/tools/testing/vma/include/dup.h b/tools/testing/vma/include/dup.h index c3be8a2381e1..fa2df96f9dee 100644 --- a/tools/testing/vma/include/dup.h +++ b/tools/testing/vma/include/dup.h @@ -951,6 +951,27 @@ static __always_inline vma_flags_t vma_flags_diff_pair(const vma_flags_t *flags, return dst; } +static __always_inline bool vma_flags_same_pair(const vma_flags_t *flags, + const vma_flags_t *flags_other) +{ + const unsigned long *bitmap = flags->__vma_flags; + const unsigned long *bitmap_other = flags_other->__vma_flags; + + return bitmap_equal(bitmap, bitmap_other, NUM_VMA_FLAG_BITS); +} + +static __always_inline bool vma_flags_same_mask(const vma_flags_t *flags, + vma_flags_t flags_other) +{ + const unsigned long *bitmap = flags->__vma_flags; + const unsigned long *bitmap_other = flags_other.__vma_flags; + + return bitmap_equal(bitmap, bitmap_other, NUM_VMA_FLAG_BITS); +} + +#define vma_flags_same(flags, ...) \ + vma_flags_same_mask(flags, mk_vma_flags(__VA_ARGS__)) + static inline bool vma_test_all_mask(const struct vm_area_struct *vma, vma_flags_t flags) { -- 2.53.0