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Wed, 07 May 2025 06:10:24 -0700 (PDT) Received: from revest.zrh.corp.google.com ([2a00:79e0:9d:6:558d:e1fb:c2ec:7513]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-442cd32adcasm647435e9.6.2025.05.07.06.10.23 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 07 May 2025 06:10:24 -0700 (PDT) From: Florent Revest To: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org Cc: catalin.marinas@arm.com, will@kernel.org, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, x86@kernel.org, hpa@zytor.com, akpm@linux-foundation.org, broonie@kernel.org, thiago.bauermann@linaro.org, jackmanb@google.com, Florent Revest Subject: [PATCH v2 2/4] mm: remove CONFIG_ARCH_USES_HIGH_VMA_FLAGS Date: Wed, 7 May 2025 15:09:58 +0200 Message-ID: <20250507131000.1204175-3-revest@chromium.org> X-Mailer: git-send-email 2.49.0.987.g0cc8ee98dc-goog In-Reply-To: <20250507131000.1204175-1-revest@chromium.org> References: <20250507131000.1204175-1-revest@chromium.org> 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" Over the years, include/linux/mm.h has grown to use high VMA flags bits in various ways. Some usages, like mseal(), are guarded by CONFIG_64BIT while others like CONFIG_ARM64_MTE select CONFIG_ARCH_USES_HIGH_VMA_FLAGS and depend on the VM_HIGH_ARCH* macros that are guarded by that config. Since CONFIG_ARCH_USES_HIGH_VMA_FLAGS only guards bit mask definitions, it is safe to use on any CONFIG_64BIT config. Additionally, since all configs that currently select CONFIG_ARCH_USES_HIGH_VMA_FLAGS depend on CONFIG_64BIT, there should be no regressions. Signed-off-by: Florent Revest --- arch/arm64/Kconfig | 3 --- arch/powerpc/Kconfig | 1 - arch/x86/Kconfig | 2 -- include/linux/mm.h | 4 ++-- mm/Kconfig | 2 -- 5 files changed, 2 insertions(+), 10 deletions(-) diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index a182295e6f08b..2a0d45b16b7fd 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -2149,7 +2149,6 @@ config ARM64_MTE # Required for tag checking in the uaccess routines select ARM64_PAN select ARCH_HAS_SUBPAGE_FAULTS - select ARCH_USES_HIGH_VMA_FLAGS select ARCH_USES_PG_ARCH_2 select ARCH_USES_PG_ARCH_3 help @@ -2196,7 +2195,6 @@ menu "ARMv8.9 architectural features" config ARM64_POE prompt "Permission Overlay Extension" def_bool y - select ARCH_USES_HIGH_VMA_FLAGS select ARCH_HAS_PKEYS help The Permission Overlay Extension is used to implement Memory @@ -2235,7 +2233,6 @@ config ARM64_GCS bool "Enable support for Guarded Control Stack (GCS)" default y select ARCH_HAS_USER_SHADOW_STACK - select ARCH_USES_HIGH_VMA_FLAGS depends on !UPROBES help Guarded Control Stack (GCS) provides support for a separate diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index 6722625a406a0..e444191206b32 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -1043,7 +1043,6 @@ config PPC_MEM_KEYS def_bool y depends on PPC_BOOK3S_64 depends on PPC_64S_HASH_MMU - select ARCH_USES_HIGH_VMA_FLAGS select ARCH_HAS_PKEYS help Memory Protection Keys provides a mechanism for enforcing diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 4b9f378e05f6b..e74ba77a066e6 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -1818,7 +1818,6 @@ config X86_INTEL_MEMORY_PROTECTION_KEYS def_bool y # Note: only available in 64-bit mode depends on X86_64 && (CPU_SUP_INTEL || CPU_SUP_AMD) - select ARCH_USES_HIGH_VMA_FLAGS select ARCH_HAS_PKEYS help Memory Protection Keys provides a mechanism for enforcing @@ -1900,7 +1899,6 @@ config X86_USER_SHADOW_STACK bool "X86 userspace shadow stack" depends on AS_WRUSS depends on X86_64 - select ARCH_USES_HIGH_VMA_FLAGS select ARCH_HAS_USER_SHADOW_STACK select X86_CET help diff --git a/include/linux/mm.h b/include/linux/mm.h index fdda6b16263b3..da8f99a026deb 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -297,7 +297,7 @@ extern unsigned int kobjsize(const void *objp); #define VM_NOHUGEPAGE 0x40000000 /* MADV_NOHUGEPAGE marked this vma */ #define VM_MERGEABLE 0x80000000 /* KSM may merge identical pages */ =20 -#ifdef CONFIG_ARCH_USES_HIGH_VMA_FLAGS +#ifdef CONFIG_64BIT #define VM_HIGH_ARCH_BIT_0 32 /* bit only usable on 64-bit architectures */ #define VM_HIGH_ARCH_BIT_1 33 /* bit only usable on 64-bit architectures */ #define VM_HIGH_ARCH_BIT_2 34 /* bit only usable on 64-bit architectures */ @@ -312,7 +312,7 @@ extern unsigned int kobjsize(const void *objp); #define VM_HIGH_ARCH_4 BIT(VM_HIGH_ARCH_BIT_4) #define VM_HIGH_ARCH_5 BIT(VM_HIGH_ARCH_BIT_5) #define VM_HIGH_ARCH_6 BIT(VM_HIGH_ARCH_BIT_6) -#endif /* CONFIG_ARCH_USES_HIGH_VMA_FLAGS */ +#endif /* CONFIG_64BIT */ =20 #ifdef CONFIG_ARCH_HAS_PKEYS # define VM_PKEY_SHIFT VM_HIGH_ARCH_BIT_0 diff --git a/mm/Kconfig b/mm/Kconfig index e113f713b4938..1fff7f8bfa96f 100644 --- a/mm/Kconfig +++ b/mm/Kconfig @@ -1127,8 +1127,6 @@ config DEVICE_PRIVATE config VMAP_PFN bool =20 -config ARCH_USES_HIGH_VMA_FLAGS - bool config ARCH_HAS_PKEYS bool =20 --=20 2.49.0.987.g0cc8ee98dc-goog