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[2001:44b8:1113:6700:3c80:6152:10ca:83bc]) by smtp.gmail.com with ESMTPSA id h6sm7031275pfo.123.2020.07.01.19.54.43 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 01 Jul 2020 19:54:43 -0700 (PDT) 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 v8 2/4] kasan: Document support on 32-bit powerpc Date: Thu, 2 Jul 2020 12:54:30 +1000 Message-Id: <20200702025432.16912-3-dja@axtens.net> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200702025432.16912-1-dja@axtens.net> References: <20200702025432.16912-1-dja@axtens.net> MIME-Version: 1.0 X-Rspamd-Queue-Id: 832E4180AD801 X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam03 Content-Transfer-Encoding: quoted-printable X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: KASAN is supported on 32-bit powerpc and the docs should reflect this. Document s390 support while we're at it. Suggested-by: Christophe Leroy Reviewed-by: Christophe Leroy Signed-off-by: Daniel Axtens --- Documentation/dev-tools/kasan.rst | 7 +++++-- Documentation/powerpc/kasan.txt | 12 ++++++++++++ 2 files changed, 17 insertions(+), 2 deletions(-) create mode 100644 Documentation/powerpc/kasan.txt diff --git a/Documentation/dev-tools/kasan.rst b/Documentation/dev-tools/= kasan.rst index c652d740735d..554cbee1d240 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. =20 Currently generic KASAN is supported for the x86_64, arm64, xtensa, s390= and -riscv architectures, and tag-based KASAN is supported only for arm64. +riscv architectures. It is also supported on 32-bit powerpc kernels. Tag= -based +KASAN is supported only on arm64. =20 Usage ----- @@ -255,7 +256,9 @@ CONFIG_KASAN_VMALLOC ~~~~~~~~~~~~~~~~~~~~ =20 With ``CONFIG_KASAN_VMALLOC``, KASAN can cover vmalloc space at the -cost of greater memory usage. Currently this is only supported on x86. +cost of greater memory usage. Currently this supported on x86, s390 +and 32-bit powerpc. It is optional, except on 32-bit powerpc kernels +with module support, where it is required. =20 This works by hooking into vmalloc and vmap, and dynamically allocating real shadow memory to back the mappings. diff --git a/Documentation/powerpc/kasan.txt b/Documentation/powerpc/kasa= n.txt new file mode 100644 index 000000000000..26bb0e8bb18c --- /dev/null +++ b/Documentation/powerpc/kasan.txt @@ -0,0 +1,12 @@ +KASAN is supported on powerpc on 32-bit only. + +32 bit support +=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D + +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 s= pace. + +Instrumentation of the vmalloc area is optional, unless built with modul= es, +in which case it is required. --=20 2.25.1