Hi Zhenyu, It's probably a bug fix that unveils the link errors.
tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: c786427f57b6dc4f56f9a84da52b41216e94f125 commit: c20164dbd508c410f5d5f6b121e6cfae7c2da8ba drm/i915/gvt: always use i915_reg_t for MMIO handler definition date: 8 weeks ago config: x86_64-randconfig-h0-02181955 (attached as .config) compiler: gcc-7 (Debian 7.3.0-1) 7.3.0 reproduce: git checkout c20164dbd508c410f5d5f6b121e6cfae7c2da8ba # save the attached .config to linux build tree make ARCH=x86_64 All errors (new ones prefixed by >>): drivers/usb/dwc3/core.o: In function `__read_once_size': >> include/linux/compiler.h:183: undefined reference to >> `__tracepoint_dwc3_readl' >> include/linux/compiler.h:183: undefined reference to >> `__tracepoint_dwc3_readl' >> include/linux/compiler.h:183: undefined reference to >> `__tracepoint_dwc3_writel' >> include/linux/compiler.h:183: undefined reference to >> `__tracepoint_dwc3_writel' >> include/linux/compiler.h:183: undefined reference to >> `__tracepoint_dwc3_writel' >> include/linux/compiler.h:183: undefined reference to >> `__tracepoint_dwc3_writel' >> include/linux/compiler.h:183: undefined reference to >> `__tracepoint_dwc3_readl' >> include/linux/compiler.h:183: undefined reference to >> `__tracepoint_dwc3_readl' >> include/linux/compiler.h:183: undefined reference to >> `__tracepoint_dwc3_writel' >> include/linux/compiler.h:183: undefined reference to >> `__tracepoint_dwc3_writel' >> include/linux/compiler.h:183: undefined reference to >> `__tracepoint_dwc3_writel' >> include/linux/compiler.h:183: undefined reference to >> `__tracepoint_dwc3_writel' >> include/linux/compiler.h:183: undefined reference to >> `__tracepoint_dwc3_writel' drivers/usb/dwc3/core.o:include/linux/compiler.h:183: more undefined references to `__tracepoint_dwc3_writel' follow drivers/usb/dwc3/core.o: In function `__read_once_size': >> include/linux/compiler.h:183: undefined reference to >> `__tracepoint_dwc3_readl' >> include/linux/compiler.h:183: undefined reference to >> `__tracepoint_dwc3_readl' >> include/linux/compiler.h:183: undefined reference to >> `__tracepoint_dwc3_writel' >> include/linux/compiler.h:183: undefined reference to >> `__tracepoint_dwc3_writel' >> include/linux/compiler.h:183: undefined reference to >> `__tracepoint_dwc3_readl' >> include/linux/compiler.h:183: undefined reference to >> `__tracepoint_dwc3_readl' >> include/linux/compiler.h:183: undefined reference to >> `__tracepoint_dwc3_readl' vim +183 include/linux/compiler.h d976441f Andrey Ryabinin 2015-10-19 179 d976441f Andrey Ryabinin 2015-10-19 180 static __always_inline d976441f Andrey Ryabinin 2015-10-19 181 void __read_once_size(const volatile void *p, void *res, int size) 230fa253 Christian Borntraeger 2014-11-25 182 { d976441f Andrey Ryabinin 2015-10-19 @183 __READ_ONCE_SIZE; 230fa253 Christian Borntraeger 2014-11-25 184 } d976441f Andrey Ryabinin 2015-10-19 185 :::::: The code at line 183 was first introduced by commit :::::: d976441f44bc5d48635d081d277aa76556ffbf8b compiler, atomics, kasan: Provide READ_ONCE_NOCHECK() :::::: TO: Andrey Ryabinin <[email protected]> :::::: CC: Ingo Molnar <[email protected]> --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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