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[2001:44b8:1113:6700:5cb3:ebc3:7dc6:a17b]) by smtp.gmail.com with ESMTPSA id 3sm6228356pfi.13.2020.01.08.23.08.24 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 08 Jan 2020 23:08:25 -0800 (PST) From: Daniel Axtens To: linux-kernel@vger.kernel.org, linux-mm@kvack.org, linuxppc-dev@lists.ozlabs.org, kasan-dev@googlegroups.com, christophe.leroy@c-s.fr, aneesh.kumar@linux.ibm.com, bsingharora@gmail.com Cc: Daniel Axtens Subject: [PATCH v5 2/4] kasan: Document support on 32-bit powerpc Date: Thu, 9 Jan 2020 18:08:09 +1100 Message-Id: <20200109070811.31169-3-dja@axtens.net> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200109070811.31169-1-dja@axtens.net> References: <20200109070811.31169-1-dja@axtens.net> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org KASAN is supported on 32-bit powerpc and the docs should reflect this. Suggested-by: Christophe Leroy Reviewed-by: Christophe Leroy Signed-off-by: Daniel Axtens --- Documentation/dev-tools/kasan.rst | 3 ++- Documentation/powerpc/kasan.txt | 12 ++++++++++++ 2 files changed, 14 insertions(+), 1 deletion(-) create mode 100644 Documentation/powerpc/kasan.txt diff --git a/Documentation/dev-tools/kasan.rst b/Documentation/dev-tools/kasan.rst index e4d66e7c50de..4af2b5d2c9b4 100644 --- a/Documentation/dev-tools/kasan.rst +++ b/Documentation/dev-tools/kasan.rst @@ -22,7 +22,8 @@ global variables yet. Tag-based KASAN is only supported in Clang and requires version 7.0.0 or later. Currently generic KASAN is supported for the x86_64, arm64, xtensa and s390 -architectures, and tag-based KASAN is supported only for arm64. +architectures. It is also supported on 32-bit powerpc kernels. Tag-based KASAN +is supported only on arm64. Usage ----- diff --git a/Documentation/powerpc/kasan.txt b/Documentation/powerpc/kasan.txt new file mode 100644 index 000000000000..a85ce2ff8244 --- /dev/null +++ b/Documentation/powerpc/kasan.txt @@ -0,0 +1,12 @@ +KASAN is supported on powerpc on 32-bit only. + +32 bit support +============== + +KASAN is supported on both hash and nohash MMUs on 32-bit. + +The shadow area sits at the top of the kernel virtual memory space above the +fixmap area and occupies one eighth of the total kernel virtual memory space. + +Instrumentation of the vmalloc area is not currently supported, but modules +are. -- 2.20.1