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kbuild: modpost warn if export version crc is missing

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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>
This commit is contained in:
Nicholas Piggin 2016-11-24 03:41:42 +11:00 committed by Michal Marek
parent 4b89b7f7aa
commit d8c1eb86e9
1 changed files with 6 additions and 0 deletions
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6
scripts/mod/modpost.c
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@ -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);