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When building the kernel with Clang ThinLTO enabled, the compiler can mangle static variable names by appending suffixes such as ".llvm.<hash>" to prevent naming collisions across translation units. This name mangling breaks the section mismatch whitelisting in modpost. modpost relies on glob patterns (e.g., "*_ops" or "*_probe") to identify safe references between permanent data and initialization code. Because the LTO suffix modifies the end of the symbol name, legitimately whitelisted structures fail the match, resulting in false positive warnings. For example, a static pernet_operations struct triggers the following: WARNING: modpost: vmlinux: section mismatch in reference: \ ping_v4_net_ops.llvm.5641696707737373282 (section: .data) -> \ ping_v4_proc_init_net (section: .init.text) Fix this by ignoring "*_ops.llvm.*" in "from" symbol names (the same as "*_ops"). Reported-by: kernel test robot <lkp@intel.com> Closes: https://lore.kernel.org/oe-kbuild-all/202606111233.kM8oo8Df-lkp@intel.com/ Signed-off-by: Rong Xu <xur@google.com> Link: https://patch.msgid.link/20260617224623.1346309-1-xur@google.com Signed-off-by: Nathan Chancellor <nathan@kernel.org> |
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| mk_elfconfig.c | ||
| modpost.c | ||
| modpost.h | ||
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