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bpf, btf: Add check_btf_kconfigs helper 

This patch extracts duplicate code on error path when btf_get_module_btf()
returns NULL from the functions __register_btf_kfunc_id_set() and
register_btf_id_dtor_kfuncs() into a new helper named check_btf_kconfigs()
to check CONFIG_DEBUG_INFO_BTF and CONFIG_DEBUG_INFO_BTF_MODULES in it.

Signed-off-by: Geliang Tang <tanggeliang@kylinos.cn>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Link: https://lore.kernel.org/r/fa5537fc55f1e4d0bfd686598c81b7ab9dbd82b7.1707373307.git.tanggeliang@kylinos.cn
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
This commit is contained in:
Geliang Tang 2024-02-08 14:24:22 +08:00 committed by Martin KaFai Lau
parent b9a395f0f7
commit 9e60b0e025
1 changed files with 15 additions and 18 deletions
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33
kernel/bpf/btf.c
View File

@ -7738,6 +7738,17 @@ static struct btf *btf_get_module_btf(const struct module *module)
return btf;
}
static int check_btf_kconfigs(const struct module *module, const char *feature)
{
if (!module && IS_ENABLED(CONFIG_DEBUG_INFO_BTF)) {
pr_err("missing vmlinux BTF, cannot register %s\n", feature);
return -ENOENT;
}
if (module && IS_ENABLED(CONFIG_DEBUG_INFO_BTF_MODULES))
pr_warn("missing module BTF, cannot register %s\n", feature);
return 0;
}
BPF_CALL_4(bpf_btf_find_by_name_kind, char *, name, int, name_sz, u32, kind, int, flags)
{
struct btf *btf = NULL;
@ -8098,15 +8109,8 @@ static int __register_btf_kfunc_id_set(enum btf_kfunc_hook hook,
int ret, i;
btf = btf_get_module_btf(kset->owner);
if (!btf) {
if (!kset->owner && IS_ENABLED(CONFIG_DEBUG_INFO_BTF)) {
pr_err("missing vmlinux BTF, cannot register kfuncs\n");
return -ENOENT;
}
if (kset->owner && IS_ENABLED(CONFIG_DEBUG_INFO_BTF_MODULES))
pr_warn("missing module BTF, cannot register kfuncs\n");
return 0;
}
if (!btf)
return check_btf_kconfigs(kset->owner, "kfunc");
if (IS_ERR(btf))
return PTR_ERR(btf);
@ -8214,15 +8218,8 @@ int register_btf_id_dtor_kfuncs(const struct btf_id_dtor_kfunc *dtors, u32 add_c
int ret;
btf = btf_get_module_btf(owner);
if (!btf) {
if (!owner && IS_ENABLED(CONFIG_DEBUG_INFO_BTF)) {
pr_err("missing vmlinux BTF, cannot register dtor kfuncs\n");
return -ENOENT;
}
if (owner && IS_ENABLED(CONFIG_DEBUG_INFO_BTF_MODULES))
pr_warn("missing module BTF, cannot register dtor kfuncs\n");
return 0;
}
if (!btf)
return check_btf_kconfigs(owner, "dtor kfuncs");
if (IS_ERR(btf))
return PTR_ERR(btf);