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<p class="MsoNormal" align="left" style="text-align:left"><span lang="EN-US" style="font-size:10.0pt;font-family:"MS Gothic";mso-fareast-language:ZH-CN">Hello all,<o:p></o:p></span></p>
<p class="MsoNormal" align="left" style="text-align:left"><span lang="EN-US" style="font-size:10.0pt;font-family:"MS Gothic""><o:p> </o:p></span></p>
<p class="MsoNormal" align="left" style="text-align:left"><span lang="EN-US" style="font-size:10.0pt;font-family:"MS Gothic"">I am doing the LTP test for aarch64 platform.<o:p></o:p></span></p>
<p class="MsoNormal" align="left" style="text-align:left"><span lang="EN-US" style="font-size:10.0pt;font-family:"MS Gothic"">But there is something troubled me recently, which is mainly about the dma_thread_diotest.<o:p></o:p></span></p>
<p class="MsoNormal" align="left" style="text-align:left"><span lang="EN-US" style="font-size:10.0pt;font-family:"MS Gothic"">Those testcases were failed on the target board(Board: Renesas M3 Starter Kit Pro), which has 2 CPUs.<o:p></o:p></span></p>
<p class="MsoNormal" align="left" style="text-align:left"><span lang="EN-US" style="font-size:10.0pt;font-family:"MS Gothic""><o:p> </o:p></span></p>
<p class="MsoNormal" align="left" style="text-align:left"><span lang="EN-US" style="font-size:10.0pt;font-family:"MS Gothic"">I have seen the description of this testcase, and someone told me that:<o:p></o:p></span></p>
<p class="MsoNormal" align="left" style="text-align:left"><span lang="EN-US" style="font-size:12.0pt;font-family:"MS Sans Serif",serif;color:black">This test suite was created by this LTP commit:<a href="https://github.com/linux-test-project/ltp/commit/52de6e2616951ddafc760138f99a1195295bbfdc" title="https://github.com/linux-test-project/ltp/commit/52de6e2616951ddafc760138f99a1195295bbfdc">https://github.com/linux-test-project/ltp/commit/52de6e2616951ddafc760138f99a1195295bbfdc</a>.
</span><span lang="EN-US" style="font-size:12.0pt;font-family:"MS Sans Serif",serif;color:black"><o:p></o:p></span></p>
<p class="MsoNormal" align="left" style="text-align:left"><span lang="EN-US" style="font-size:12.0pt;font-family:"MS Sans Serif",serif;color:black">Once there was already a discussion in kernel mm community in 2008, please see this url:<a href="http://thread.gmane.org/gmane.linux.file-systems/27358" title="http://thread.gmane.org/gmane.linux.file-systems/27358">http://thread.gmane.org/gmane.linux.file-systems/27358</a>.<br>
But unfortunately this bug was not fixed and it still exists in the latest upstream kernel. Some engineers from mm community think it's one whose fix would cause more troulbe than it's worth and MADV_DONTFORK is a good enough workaround. I will follow up this
discussion to try to reach a conclusion whether it's worth to fix this issue.</span><span lang="EN-US" style="font-size:12.0pt;font-family:SimSun"><o:p></o:p></span></p>
<p class="MsoNormal" align="left" style="text-align:left"><span lang="EN-US" style="font-size:10.0pt;font-family:"MS Gothic""><o:p> </o:p></span></p>
<p class="MsoNormal" align="left" style="text-align:left"><span lang="EN-US" style="font-size:10.0pt;font-family:"MS Gothic"">But I wonder whether this bug have been fixed and what I can do except¡®don't do this test¡¯.<o:p></o:p></span></p>
<p class="MsoNormal" align="left" style="text-align:left"><span lang="EN-US" style="font-size:10.0pt;font-family:"MS Gothic"">Looking for your reply at your convenience.<o:p></o:p></span></p>
<p class="MsoNormal" align="left" style="text-align:left"><span lang="EN-US" style="font-size:10.0pt;font-family:"MS Gothic"">Thanks in advance.<o:p></o:p></span></p>
<p class="MsoNormal" align="left" style="text-align:left"><span lang="EN-US" style="font-size:10.0pt;font-family:"MS Gothic""><o:p> </o:p></span></p>
<p class="MsoNormal" align="left" style="text-align:left"><span lang="EN-US" style="font-size:10.0pt;font-family:"MS Gothic";mso-fareast-language:ZH-CN">B.R.<o:p></o:p></span></p>
<p class="MsoNormal" align="left" style="text-align:left"><span lang="EN-US" style="font-size:10.0pt;font-family:"MS Gothic"">Liu<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
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