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To: Nick Hu References: <09d5108e-f0ba-13d3-be9e-119f49f6bd85@virtuozzo.com> <20190827090738.GA22972@andestech.com> From: Andrey Ryabinin Message-ID: <92dd5f5f-c8a2-53c3-4d61-44acc4366844@virtuozzo.com> Date: Tue, 27 Aug 2019 12:33:11 +0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0 MIME-Version: 1.0 In-Reply-To: <20190827090738.GA22972@andestech.com> Content-Language: en-US X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190827_023334_181176_919664AB X-CRM114-Status: GOOD ( 14.42 ) X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: "aou@eecs.berkeley.edu" , =?UTF-8?B?QWxhbiBRdWV5LUxpYW5nIEthbyjpq5jprYHoia8p?= , "atish.patra@wdc.com" , "gregkh@linuxfoundation.org" , "palmer@sifive.com" , "linux-kernel@vger.kernel.org" , "kasan-dev@googlegroups.com" , =?UTF-8?B?6Zui6IG3Wm9uZyBab25nLVhpYW4gTGko5p2O5a6X5oayKQ==?= , "alexios.zavras@intel.com" , "Anup.Patel@wdc.com" , "glider@google.com" , "green.hu@gmail.com" , "paul.walmsley@sifive.com" , "tglx@linutronix.de" , "deanbo422@gmail.com" , "linux-riscv@lists.infradead.org" , "dvyukov@google.com" Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-riscv" Errors-To: linux-riscv-bounces+infradead-linux-riscv=archiver.kernel.org@lists.infradead.org On 8/27/19 12:07 PM, Nick Hu wrote: > Hi Andrey > > On Thu, Aug 22, 2019 at 11:59:02PM +0800, Andrey Ryabinin wrote: >> On 8/7/19 10:19 AM, Nick Hu wrote: >>> There are some features which need this string operation for compilation, >>> like KASAN. So the purpose of this porting is for the features like KASAN >>> which cannot be compiled without it. >>> >> >> Compilation error can be fixed by diff bellow (I didn't test it). >> If you don't need memmove very early (before kasan_early_init()) than arch-specific not-instrumented memmove() >> isn't necessary to have. >> >> --- >> mm/kasan/common.c | 2 ++ >> 1 file changed, 2 insertions(+) >> >> diff --git a/mm/kasan/common.c b/mm/kasan/common.c >> index 6814d6d6a023..897f9520bab3 100644 >> --- a/mm/kasan/common.c >> +++ b/mm/kasan/common.c >> @@ -107,6 +107,7 @@ void *memset(void *addr, int c, size_t len) >> return __memset(addr, c, len); >> } >> >> +#ifdef __HAVE_ARCH_MEMMOVE >> #undef memmove >> void *memmove(void *dest, const void *src, size_t len) >> { >> @@ -115,6 +116,7 @@ void *memmove(void *dest, const void *src, size_t len) >> >> return __memmove(dest, src, len); >> } >> +#endif >> >> #undef memcpy >> void *memcpy(void *dest, const void *src, size_t len) >> -- >> 2.21.0 >> >> >> > I have confirmed that the string operations are not used before kasan_early_init(). > But I can't make sure whether other ARCHs would need it before kasan_early_init(). > Do you have any idea to check that? Should I cc all other ARCH maintainers? This doesn't affect other ARCHes in any way. If other arches have their own not-instrumented memmove implementation (and they do), they will continue to be able to use it early. _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv