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objtool/klp: Don't correlate __initstub__ symbols

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With LTO, the initcall infrastructure generates __initstub__kmod_*
wrapper functions in .init.text.  These are the LTO equivalent of
__initcall__kmod_* data pointers, which are already excluded from
correlation.

These are __init functions whose memory is freed after boot, so there's
no reason to include or reference them in a livepatch module.

Acked-by: Song Liu <song@kernel.org>
Reviewed-by: Miroslav Benes <mbenes@suse.cz>
Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>
This commit is contained in:
Josh Poimboeuf 2026-04-20 19:20:42 -07:00
parent 710c4c2546
commit 0a7823d1d7
1 changed files with 8 additions and 2 deletions
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10
tools/objtool/klp-diff.c
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@ -370,6 +370,12 @@ static bool is_abs_sym(struct symbol *sym)
return sym->sym.st_shndx == SHN_ABS && !is_file_sym(sym);
}
static bool is_initcall_sym(struct symbol *sym)
{
return strstarts(sym->name, "__initcall__") ||
strstarts(sym->name, "__initstub__");
}
/*
* These symbols should never be correlated, so their local patched versions
* are used instead of linking to the originals.
@ -384,10 +390,10 @@ static bool dont_correlate(struct symbol *sym)
is_uncorrelated_static_local(sym) ||
is_clang_tmp_label(sym) ||
is_string_sec(sym->sec) ||
is_initcall_sym(sym) ||
is_addressable_sym(sym) ||
is_special_section(sym->sec) ||
is_special_section_aux(sym->sec) ||
strstarts(sym->name, "__initcall__");
is_special_section_aux(sym->sec);
}
struct process_demangled_name_data {