kbuild: modpost warn if export version crc is missing (d8c1eb86) · Commits · 戴 / test

This catches the failing ceph CRC on with: LD vmlinux.o MODPOST vmlinux.o WARNING: EXPORT symbol "ceph_monc_do_statfs" [vmlinux] version generation failed, symbol will not be versioned. When the modules referring to exported symbols are built, there is an existing warning for missing CRC, but it's not always the case such any such module will be built, and in any case it is useful to get a warning at the source. This gets a little verbose with CONFIG_DEBUG_SECTION_MISMATCH, producing a warning with each object linked, but I didn't think that warranted extra complexity to avoid. Signed-off-by:

Nicholas Piggin <npiggin@gmail.com> Signed-off-by:

Michal Marek <mmarek@suse.com>

scripts/mod/modpost.c

+6 −0

Original line number	Diff line number	Diff line
		@@ -609,6 +609,7 @@ static void handle_modversions(struct module mod, struct elf_info info,
		{
		unsigned int crc;
		enum export export;
		bool is_crc = false;

		if ((!is_vmlinux(mod->name) \|\| mod->is_dot_o) &&
		strncmp(symname, "__ksymtab", 9) == 0)
		@@ -618,6 +619,7 @@ static void handle_modversions(struct module mod, struct elf_info info,

		/* CRC'd symbol */
		if (strncmp(symname, CRC_PFX, strlen(CRC_PFX)) == 0) {
		is_crc = true;
		crc = (unsigned int) sym->st_value;
		sym_update_crc(symname + strlen(CRC_PFX), mod, crc,
		export);
		@@ -663,6 +665,10 @@ static void handle_modversions(struct module mod, struct elf_info info,
		else
		symname++;
		#endif
		if (is_crc) {
		const char *e = is_vmlinux(mod->name) ?"":".ko";
		warn("EXPORT symbol \"%s\" [%s%s] version generation failed, symbol will not be versioned.\n", symname + strlen(CRC_PFX), mod->name, e);
		}
		mod->unres = alloc_symbol(symname,
		ELF_ST_BIND(sym->st_info) == STB_WEAK,
		mod->unres);

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