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[35.195.168.105]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-39c30096896sm2503496f8f.19.2025.04.03.11.38.07 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 03 Apr 2025 11:38:07 -0700 (PDT) From: "=?UTF-8?q?Kornel=20Dul=C4=99ba?=" X-Google-Original-From: =?UTF-8?q?Kornel=20Dul=C4=99ba?= To: Catalin Marinas , Will Deacon Cc: Steve Capper , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, ssradjacoumar@google.com, chromeos-krk-upstreaming@google.com, =?UTF-8?q?Kornel=20Dul=C4=99ba?= Subject: [PATCH] arm64: Support ARM64_VA_BITS=52 when setting ARCH_MMAP_RND_BITS_MAX Date: Thu, 3 Apr 2025 18:36:38 +0000 Message-ID: <20250403183638.3386628-1-korneld@google.com> X-Mailer: git-send-email 2.49.0.504.g3bcea36a83-goog Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable When the 52-bit virtual addressing was enabled the select like ARCH_MMAP_RND_BITS_MAX logic was never updated to account for it. Because of that the rnd max bits would be set to the default value of 18 when ARM64_VA_BITS=3D52. Fix this by setting ARCH_MMAP_RND_BITS_MAX to the same value that would be used if 48-bit addressing was used. That's because the 52-bit addressing is used only if the caller provides a hint to mmap, with a fallback to 48-bit addressing. Fixes: b6d00d47e81a ("arm64: mm: Introduce 52-bit Kernel VAs") Signed-off-by: Kornel Dul=C4=99ba Reviewed-by: Anshuman Khandual --- arch/arm64/Kconfig | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index 748c34dc953c..38e0bac567f5 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -332,9 +332,9 @@ config ARCH_MMAP_RND_BITS_MAX default 24 if ARM64_VA_BITS=3D39 default 27 if ARM64_VA_BITS=3D42 default 30 if ARM64_VA_BITS=3D47 - default 29 if ARM64_VA_BITS=3D48 && ARM64_64K_PAGES - default 31 if ARM64_VA_BITS=3D48 && ARM64_16K_PAGES - default 33 if ARM64_VA_BITS=3D48 + default 29 if (ARM64_VA_BITS=3D48 || ARM64_VA_BITS=3D52) && ARM64_64K_PAG= ES + default 31 if (ARM64_VA_BITS=3D48 || ARM64_VA_BITS=3D52) && ARM64_16K_PAG= ES + default 33 if (ARM64_VA_BITS=3D48 || ARM64_VA_BITS=3D52) default 14 if ARM64_64K_PAGES default 16 if ARM64_16K_PAGES default 18 --=20 2.49.0.504.g3bcea36a83-goog