From nobody Tue Apr 7 16:14:43 2026 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E634A40149E; Thu, 12 Mar 2026 19:16:58 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773343019; cv=none; b=jxUoGNpIEZPwp+meN/F2O3I0tbhj/VMZzO5DN2PKIGBSkw1KftPQ0qb1jKZa6hwPzQo0NESCyTl5auh1w2TfqJ2w8KejiOpzXQAFVJPjhpX5Hm2ye+e3QiyY/T70swF5I9Rf470zJ/bB+6zFakLGMCQOGkmrIu6s0mtHusCL0s0= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773343019; c=relaxed/simple; bh=cMZvtYTbVi8gGI62iqsWZ4caZrMQ/fPLlqyhjNcRyx0=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=G0fOssk0fcbAlnjlSL1pjpAB2niW50Ela1YI8Lk4ZHTZb/ydmhOwd+pN1CDprc1Wz7Egc/17s4jiBUeQCU28yW8tPQHzugOd0+2ECGtz0GQrkI+B2o2h6Y7KidjWI/Kpvg/+gMqtniIygLWfo6tTTv4I8OZp50ZRYz9Zvg/hHrw= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=cEiK7/n4; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="cEiK7/n4" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 126E0C2BC9E; Thu, 12 Mar 2026 19:16:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1773343018; bh=cMZvtYTbVi8gGI62iqsWZ4caZrMQ/fPLlqyhjNcRyx0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=cEiK7/n40R+U6XNkiSalA/AXJ/bEgYclxYDzCqR94yWMygwmC794VCL0NxoNYMt3J RHgWYcxQkKel2D7y5Qt7KDsDDMbbnor8tS00TxPxTu7yixFOVnFjv/PAKh+RDo3tpd yGc6lmIpIhzsiJVtCyAB02NBMWdKtc6jRMZms3t37fq7iqSAm8xvmcKPPar1qbfOd9 EvzQJ8XXrWFAYsPwnjWKyAaJA6DLfoLru6ENVdQxEMDyebpaZ7Ji0O9VLo8T3kTXXo yolKRFYDkMz5uAmNg47v7Mny0fse4ZkcVEuNAaoLI86leo+dqL+SZpfMRoIRQSV5f/ wEw5+9/hlVO1A== From: "Lorenzo Stoakes (Oracle)" To: Andrew Morton Cc: David Hildenbrand , "Liam R . 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: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" 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_pa= ir(const vma_flags_t *flags, return dst; } =20 +/* 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 =3D flags->__vma_flags; + const unsigned long *bitmap_other =3D 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 =3D flags->__vma_flags; + const unsigned long *bitmap_other =3D 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 =3D flags->__vma_flags; - const unsigned long *bitmap_other =3D 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/du= p.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; } =20 +static __always_inline bool vma_flags_same_pair(const vma_flags_t *flags, + const vma_flags_t *flags_other) +{ + const unsigned long *bitmap =3D flags->__vma_flags; + const unsigned long *bitmap_other =3D 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 =3D flags->__vma_flags; + const unsigned long *bitmap_other =3D 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) { --=20 2.53.0