-----Original Message----- From: Wei Hu Sent: 2019年11月27日 19:26 To: Rong Chen <rong.a.chen(a)intel.com&gt;; kbuild test robot <lkp(a)intel.com&gt; Cc: kbuild-all(a)lists.01.org Subject: RE: [kbuild-all] Re: [EXTERNAL] Re: [PATCH v2] video: hyperv: hyperv_fb: Use physical memory for fb on HyperV Gen 1 VMs. > -----Original Message----- > From: Rong Chen <rong.a.chen(a)intel.com&gt; > Sent: 2019年11月27日 16:29 > To: Wei Hu <weh(a)microsoft.com&gt;; kbuild test robot <lkp(a)intel.com&gt; > Cc: kbuild-all(a)lists.01.org > Subject: Re: [kbuild-all] Re: [EXTERNAL] Re: [PATCH v2] video: hyperv: hyperv_fb: > Use physical memory for fb on HyperV Gen 1 VMs. > > > > On 11/27/19 3:57 PM, Wei Hu wrote: > > > >> -----Original Message----- > >> From: Rong Chen <rong.a.chen(a)intel.com&gt; > >> Sent: 2019年11月27日 15:40 > >> To: Wei Hu <weh(a)microsoft.com&gt;; kbuild test robot <lkp(a)intel.com&gt; > >> Cc: kbuild-all(a)lists.01.org > >> Subject: Re: [kbuild-all] Re: [EXTERNAL] Re: [PATCH v2] video: hyperv: > hyperv_fb: > >> Use physical memory for fb on HyperV Gen 1 VMs. > >> > >> > >> > >> On 11/26/19 1:10 PM, Wei Hu wrote: > >>> Hello > >>> > >>>> Hi Wei, > >>>> > >>>> I love your patch! Yet something to improve: > >>>> > >>>> [auto build test ERROR on next-20191122] [cannot apply to linus/master > >> v5.4- > >>>> rc8 v5.4-rc7 v5.4-rc6 v5.4] [if your patch is applied to the wrong git tree, > >> please > >>>> drop us a note to help improve the system. BTW, we also suggest to use '-- > >> base' > >>>> option to specify the base tree in git format-patch, please see > >>>> > >> > https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fstackov > >> > erflow.com%2Fa%2F37406982&amp;data=02%7C01%7Cweh%40microsoft.co > >> > m%7C0a066e2f4f2540c2a06808d771a89108%7C72f988bf86f141af91ab2d7cd > >> > 011db47%7C1%7C0%7C637102843751160438&amp;sdata=CdmaSvX3I3TaGks > >>>> ve9R7N0Z3Sx1ln5Z3CYHuL5thLrI%3D&amp;reserved=0] > >>>> > >>>> url: > >>>> > >> > https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub. > >>>> com%2F0day-ci%2Flinux%2Fcommits%2FWei-Hu%2Fvideo-hyperv- > >> hyperv_fb- > >>>> Use-physical-memory-for-fb-on-HyperV-Gen-1-VMs%2F20191124- > >>>> > >> > 163533&amp;data=02%7C01%7Cweh%40microsoft.com%7C0a066e2f4f2540c > >>>> > 2a06808d771a89108%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7 > >>>> > >> > C637102843751160438&amp;sdata=eDTZuM3ZJmVw6FXgcl9adf9qH9wMboNr > >>>> aFC1KTjb6YE%3D&amp;reserved=0 > >>>> base: b9d3d01405061bb42358fe53f824e894a1922ced > >>>> config: i386-randconfig-b003-20191125 (attached as .config) > >>>> compiler: gcc-7 (Debian 7.4.0-14) 7.4.0 > >>>> reproduce: > >>>> # save the attached .config to linux build tree > >>>> make ARCH=i386 > >>>> > >>>> If you fix the issue, kindly add following tag > >>>> Reported-by: kbuild test robot <lkp(a)intel.com&gt; > >>>> > ... > > >> Hi Wei, > >> > >> We can reproduce the issue with attached config file,  CONFIG_CMA is not > >> set in the config, > >> I think it maybe the root cause and it's a kconfig dependency problem. > >> > >> Best Regards, > >> Rong Chen > > Thanks Rong. Would you let me know if you hit this only when building 32 bit > > kernel, or when building both 32 and 64 bit? > > > > The .config file you sent doesn't have CONFIG_CMA set. However, when I was > > building, the build process asked me about the CMA configurations. Hence, in > > my .config file have following lines: > > > > CONFIG_CMA=y > > CONFIG_DMA_CMA=y > > CONFIG_HAVE_DMA_CONTIGUOUS=y > > > > Why first two setting are no in your .config file? > > Hi Wei, > > The config was generated by randconfig, it means the current config > dependency allows to not enable CONFIG_CMA. > Ok. I will add "select CMA if HAVE_DMA_CONTIGUOUS" in the patch.