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[82.11.51.62]) by smtp.gmail.com with ESMTPSA id fj12-20020a05600c0c8c00b003ef67848a21sm5560213wmb.13.2023.04.06.08.14.43 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 06 Apr 2023 08:14:44 -0700 (PDT) From: Lucas Tanure To: Rob Herring , Frank Rowand , Mike Rapoport , Andrew Morton Cc: devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, jbrunet@baylibre.com, linux-amlogic@lists.infradead.org, linux-arm-kernel@lists.infradead.org, martin.blumenstingl@googlemail.com, narmstrong@baylibre.com, stefan@agner.ch, Lucas Tanure Subject: [PATCH 0/2] Fix Random Kernel panic from when fail to reserve memory Date: Thu, 6 Apr 2023 16:14:27 +0100 Message-Id: <20230406151429.524591-1-tanure@linux.com> X-Mailer: git-send-email 2.40.0 MIME-Version: 1.0 X-Spam-Status: No, score=0.5 required=5.0 tests=FREEMAIL_FORGED_FROMDOMAIN, FREEMAIL_FROM,HEADER_FROM_DIFFERENT_DOMAINS,RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H2,SPF_HELO_NONE,SPF_PASS autolearn=no autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1762442342929839320?= X-GMAIL-MSGID: =?utf-8?q?1762442342929839320?= I am trying to fix an issue where the kernel panics randomly on my Vim3 board. The issue happens when the ARM Trusted Firmware memory is not removed from the available ram. This happens because my u-boot provides this region as a /memreserve/, but it doesn't flag it as nomap. And the kernel can't map as nomap as the region is already reserved. My proposal here is to allow the kernel to mark as nomap if the region from the device tree and FDT have the same base and size. arch/arm64/boot/dts/amlogic/meson-g12-common.dtsi: /* 3 MiB reserved for ARM Trusted Firmware (BL31) */ secmon_reserved: secmon@5000000 { reg = <0x0 0x05000000 0x0 0x300000>; no-map; }; Previos Threads: #regzbot link: https://lore.kernel.org/linux-arm-kernel/40ca11f84b7cdbfb9ad2ddd480cb204a@agner.ch/#regzbot #regzbot link: https://lore.kernel.org/all/CAJX_Q+1Tjc+-TjZ6JW9X0NxEdFe=82a9626yL63j7uVD4LpxEA@mail.gmail.com/ Lucas Tanure (2): memblock: Differentiate regions overlap from both regions being the same of: fdt: Allow the kernel to mark nomap regions received from fdt drivers/of/fdt.c | 10 ++++++---- include/linux/memblock.h | 18 +++++++++++++++--- mm/memblock.c | 37 ++++++++++++++++++++++++------------- 3 files changed, 45 insertions(+), 20 deletions(-)