From 9a289cc425bf469642533e4afa01c90f08971d01 Mon Sep 17 00:00:00 2001 From: Rong Xu Date: Wed, 17 Jun 2026 15:46:23 -0700 Subject: [PATCH] modpost: Ignore Clang LTO suffixes in symbol matching When building the kernel with Clang ThinLTO enabled, the compiler can mangle static variable names by appending suffixes such as ".llvm." 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 Closes: https://lore.kernel.org/oe-kbuild-all/202606111233.kM8oo8Df-lkp@intel.com/ Signed-off-by: Rong Xu Link: https://patch.msgid.link/20260617224623.1346309-1-xur@google.com Signed-off-by: Nathan Chancellor --- scripts/mod/modpost.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c index d592548cbd60..a7b72a81d248 100644 --- a/scripts/mod/modpost.c +++ b/scripts/mod/modpost.c @@ -969,7 +969,7 @@ static int secref_whitelist(const char *fromsec, const char *fromsym, /* symbols in data sections that may refer to any init/exit sections */ if (match(fromsec, PATTERNS(DATA_SECTIONS)) && match(tosec, PATTERNS(ALL_INIT_SECTIONS, ALL_EXIT_SECTIONS)) && - match(fromsym, PATTERNS("*_ops", "*_console"))) + match(fromsym, PATTERNS("*_ops", "*_ops.llvm.*", "*_console"))) return 0; /* Check for pattern 3 */