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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 v3 10/23] mm/vma: introduce vma_flags_same[_mask/_pair]() Date: Wed, 18 Mar 2026 15:50:21 +0000 Message-ID: <028d03f1b980b7f65fcc556db2e97224c06af1a6.1773846935.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: rspam02 X-Rspamd-Queue-Id: AF9F5C0004 X-Stat-Signature: 4m6b1cizpzewibw39a6itn96brrqok3o X-Rspam-User: X-HE-Tag: 1773849069-623594 X-HE-Meta: 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 w92QnHU2 wH9ouVx4/XDXjLuGmiMHUkJSzxwcdNBvNkIEo6J4QZxbM+zQIQrMEJbWXnZW5PcyJqQ1+GW1VT6bqy2kSPYbRSXBb5HGX1HokQJ5jTDlSxZ3w1XKOr+Y5Zp9/JI/ctC8covTDtNJm0In0NP8YBxh1BmRHQdgk9K2PE4xa1GPTMo/L7rTrBfgSVcz+tBbfit75wI1gXS05Jcq1MPPxn97ubQx2W/Ihk9C3nSBssa4lR6f69y0LAZYIyNcfQ7gvegOSR9kuboOWeBTpIjE3/knfyBprnem7BrKq7koyJd/qEjz4+nWSqIj6HyjAl6BYG+74+HARJhb6o2MP3olBLx/8tAgYu3CSx/O7L40q 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 | 11 ----------- tools/testing/vma/include/dup.h | 21 +++++++++++++++++++++ 3 files changed, 49 insertions(+), 11 deletions(-) diff --git a/include/linux/mm.h b/include/linux/mm.h index 42d346684678..b170cee95e25 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -1207,6 +1207,34 @@ 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 8f33df02816a..2c498e713fbd 100644 --- a/tools/testing/vma/include/custom.h +++ b/tools/testing/vma/include/custom.h @@ -102,16 +102,5 @@ static inline unsigned long vma_kernel_pagesize(struct vm_area_struct *vma) return PAGE_SIZE; } -/* 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 802b3d97b627..65f630923461 100644 --- a/tools/testing/vma/include/dup.h +++ b/tools/testing/vma/include/dup.h @@ -954,6 +954,27 @@ 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