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X-MS-Exchange-CrossTenant-Id: 46c98d88-e344-4ed4-8496-4ed7712e255d X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: STXBo+r6ILI5QrSAyWOAiW/xQTYlzw/V8XlA+Zna4viFhxHKxpCs4Y3mmAX0YVTE0g8RSU0CnHm42ETpIieQKQ== X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM3PPF6C1A2BDF1 X-OriginatorOrg: intel.com On Mon, Aug 25, 2025 at 10:00:51AM -0700, Nathan Chancellor wrote: > Hi Naman, > > On Sun, Aug 24, 2025 at 11:13:51PM +0530, Naman Jain wrote: > > > > > > On 8/24/2025 12:02 PM, kernel test robot wrote: > > > tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master > > > head: 0f4c93f7eb861acab537dbe94441817a270537bf > > > commit: 96a1d2495c2f48467a91b8657bd594350b84ea9e [3139/4234] Drivers: hv: Introduce mshv_vtl driver > > > config: i386-buildonly-randconfig-2003-20250824 (https://download.01.org/0day-ci/archive/20250824/202508240828.pVaUV45D-lkp@intel.com/config) > > > compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261) > > > reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250824/202508240828.pVaUV45D-lkp@intel.com/reproduce) > > > > > > If you fix the issue in a separate patch/commit (i.e. not just a new version of > > > the same patch/commit), kindly add following tags > > > | Reported-by: kernel test robot > > > | Closes: https://lore.kernel.org/oe-kbuild-all/202508240828.pVaUV45D-lkp@intel.com/ > > > > > > All errors (new ones prefixed by >>): > > > > > > > > error: :0:0: ran out of registers during register allocation in function 'hv_call_get_vp_registers' > > > > > error: :0:0: ran out of registers during register allocation in function 'hv_call_set_vp_registers' > > > > > error: :0:0: ran out of registers during register allocation in function 'hv_call_get_partition_property' > > > 3 errors generated. > > > > > > > +Nathan > > > > I can see a bunch of similar warnings previously reported, in different > > functions, but could not find a fix for it, or if this > > is a blocking error: > > > > https://lore.kernel.org/all/?q=s%3A%22ran+out+of+registers+during+register+allocation%22 > > > > These all are reported on below 32 bit config, compiled with LLVM: > > i386-buildonly-randconfig-* > > > > Found previous comment from Nathan Chancellor, here, which seems to be > > related to this error: > > https://lore.kernel.org/all/20250507022649.GA1984217@ax162/ > > > > """ > > This configuration has CONFIG_MATOM=y, which does not really work well > > with clang for this reason and some others that have come up in the > > past. Given it is likely that nobody will care enough to fix this on the > > LLVM side (since it is 32-bit), we should probably just block using > > MATOM with CC_IS_CLANG, which Arnd and I had talked about at the last > > ClangBuiltLinux meeting. > > """ > > > > This gives me an impression that we can safely ignore these errors from > > kernel test bot. > > Requesting Nathan to please correct me if I am wrong. > > Yes, this is all correct. I will try to pursue an actual kernel side fix > for this in Kconfig but I think the Intel folks can also start ignoring > these reports for ARCH=i386 and CONFIG_MATOM so that they do not get > sent to other kernel developers for random changes. Got it, thanks Nathan, we will ignore these issues to avoid further reports. > > Cheers, > Nathan >