From: Geliang Tang <tanggeliang@kylinos.cn>
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
register_check_missing_btf() to check CONFIG_DEBUG_INFO_BTF,
CONFIG_DEBUG_INFO_BTF_MODULES and CONFIG_MODULE_ALLOW_BTF_MISMATCH in it.
Signed-off-by: Geliang Tang <tanggeliang@kylinos.cn>
---
kernel/bpf/btf.c | 42 ++++++++++++++++++++++--------------------
1 file changed, 22 insertions(+), 20 deletions(-)
diff --git a/kernel/bpf/btf.c b/kernel/bpf/btf.c
index f7725cb6e564..1ebe26a3a7a5 100644
--- a/kernel/bpf/btf.c
+++ b/kernel/bpf/btf.c
@@ -7738,6 +7738,24 @@ static struct btf *btf_get_module_btf(const struct module *module)
return btf;
}
+static int register_check_missing_btf(const struct module *module, const char *msg)
+{
+ if (!module && IS_ENABLED(CONFIG_DEBUG_INFO_BTF)) {
+ pr_err("missing vmlinux BTF, cannot register %s\n", msg);
+ return -ENOENT;
+ }
+ if (module && IS_ENABLED(CONFIG_DEBUG_INFO_BTF_MODULES)) {
+ if (IS_ENABLED(CONFIG_MODULE_ALLOW_BTF_MISMATCH)) {
+ pr_warn("allow module %s BTF mismatch, skip register %s\n",
+ module->name, msg);
+ return 0;
+ }
+ pr_err("missing module %s BTF, cannot register %s\n", module->name, msg);
+ return -ENOENT;
+ }
+ 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 +8116,8 @@ 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 register_check_missing_btf(kset->owner, "kfuncs");
if (IS_ERR(btf))
return PTR_ERR(btf);
@@ -8214,17 +8225,8 @@ 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_err("missing module BTF, cannot register dtor kfuncs\n");
- return -ENOENT;
- }
- return 0;
- }
+ if (!btf)
+ return register_check_missing_btf(owner, "dtor kfuncs");
if (IS_ERR(btf))
return PTR_ERR(btf);
--
2.40.1Hi Geliang,
kernel test robot noticed the following build errors:
[auto build test ERROR on bpf-next/master]
url: https://github.com/intel-lab-lkp/linux/commits/Geliang-Tang/bpf-btf-Add-register_check_missing_btf-helper/20240203-155524
base: https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master
patch link: https://lore.kernel.org/r/f4b147ddaa8fe8c07c7ba77a1d61780bffc49bb6.1706946547.git.tanggeliang%40kylinos.cn
patch subject: [PATCH bpf-next v2 1/2] bpf, btf: Add register_check_missing_btf helper
config: arm-imxrt_defconfig (https://download.01.org/0day-ci/archive/20240204/202402040934.Fph0XeEo-lkp@intel.com/config)
compiler: clang version 19.0.0git (https://github.com/llvm/llvm-project 7dd790db8b77c4a833c06632e903dc4f13877a64)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240204/202402040934.Fph0XeEo-lkp@intel.com/reproduce)
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202402040934.Fph0XeEo-lkp@intel.com/
All errors (new ones prefixed by >>):
>> kernel/bpf/btf.c:7750:11: error: incomplete definition of type 'struct module'
7750 | module->name, msg);
| ~~~~~~^
include/linux/printk.h:508:37: note: expanded from macro 'pr_warn'
508 | printk(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__)
| ^~~~~~~~~~~
include/linux/printk.h:455:60: note: expanded from macro 'printk'
455 | #define printk(fmt, ...) printk_index_wrap(_printk, fmt, ##__VA_ARGS__)
| ^~~~~~~~~~~
include/linux/printk.h:427:19: note: expanded from macro 'printk_index_wrap'
427 | _p_func(_fmt, ##__VA_ARGS__); \
| ^~~~~~~~~~~
include/linux/printk.h:348:8: note: forward declaration of 'struct module'
348 | struct module;
| ^
kernel/bpf/btf.c:7753:63: error: incomplete definition of type 'struct module'
7753 | pr_err("missing module %s BTF, cannot register %s\n", module->name, msg);
| ~~~~~~^
include/linux/printk.h:498:33: note: expanded from macro 'pr_err'
498 | printk(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
| ^~~~~~~~~~~
include/linux/printk.h:455:60: note: expanded from macro 'printk'
455 | #define printk(fmt, ...) printk_index_wrap(_printk, fmt, ##__VA_ARGS__)
| ^~~~~~~~~~~
include/linux/printk.h:427:19: note: expanded from macro 'printk_index_wrap'
427 | _p_func(_fmt, ##__VA_ARGS__); \
| ^~~~~~~~~~~
include/linux/printk.h:348:8: note: forward declaration of 'struct module'
348 | struct module;
| ^
2 errors generated.
vim +7750 kernel/bpf/btf.c
7740
7741 static int register_check_missing_btf(const struct module *module, const char *msg)
7742 {
7743 if (!module && IS_ENABLED(CONFIG_DEBUG_INFO_BTF)) {
7744 pr_err("missing vmlinux BTF, cannot register %s\n", msg);
7745 return -ENOENT;
7746 }
7747 if (module && IS_ENABLED(CONFIG_DEBUG_INFO_BTF_MODULES)) {
7748 if (IS_ENABLED(CONFIG_MODULE_ALLOW_BTF_MISMATCH)) {
7749 pr_warn("allow module %s BTF mismatch, skip register %s\n",
> 7750 module->name, msg);
7751 return 0;
7752 }
7753 pr_err("missing module %s BTF, cannot register %s\n", module->name, msg);
7754 return -ENOENT;
7755 }
7756 return 0;
7757 }
7758
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
Hi Geliang,
kernel test robot noticed the following build errors:
[auto build test ERROR on bpf-next/master]
url: https://github.com/intel-lab-lkp/linux/commits/Geliang-Tang/bpf-btf-Add-register_check_missing_btf-helper/20240203-155524
base: https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master
patch link: https://lore.kernel.org/r/f4b147ddaa8fe8c07c7ba77a1d61780bffc49bb6.1706946547.git.tanggeliang%40kylinos.cn
patch subject: [PATCH bpf-next v2 1/2] bpf, btf: Add register_check_missing_btf helper
config: arm-randconfig-001-20240204 (https://download.01.org/0day-ci/archive/20240204/202402040740.WcfFYJQX-lkp@intel.com/config)
compiler: arm-linux-gnueabi-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240204/202402040740.WcfFYJQX-lkp@intel.com/reproduce)
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202402040740.WcfFYJQX-lkp@intel.com/
All errors (new ones prefixed by >>):
kernel/bpf/btf.c: In function 'btf_seq_show':
kernel/bpf/btf.c:7286:29: warning: function 'btf_seq_show' might be a candidate for 'gnu_printf' format attribute [-Wsuggest-attribute=format]
7286 | seq_vprintf((struct seq_file *)show->target, fmt, args);
| ^~~~~~~~
kernel/bpf/btf.c: In function 'btf_snprintf_show':
kernel/bpf/btf.c:7323:9: warning: function 'btf_snprintf_show' might be a candidate for 'gnu_printf' format attribute [-Wsuggest-attribute=format]
7323 | len = vsnprintf(show->target, ssnprintf->len_left, fmt, args);
| ^~~
In file included from include/asm-generic/bug.h:22,
from arch/arm/include/asm/bug.h:60,
from include/linux/bug.h:5,
from include/linux/thread_info.h:13,
from include/linux/sched.h:14,
from include/linux/ptrace.h:6,
from include/uapi/asm-generic/bpf_perf_event.h:4,
from ./arch/arm/include/generated/uapi/asm/bpf_perf_event.h:1,
from include/uapi/linux/bpf_perf_event.h:11,
from kernel/bpf/btf.c:6:
kernel/bpf/btf.c: In function 'register_check_missing_btf':
>> kernel/bpf/btf.c:7750:39: error: invalid use of undefined type 'const struct module'
7750 | module->name, msg);
| ^~
include/linux/printk.h:427:33: note: in definition of macro 'printk_index_wrap'
427 | _p_func(_fmt, ##__VA_ARGS__); \
| ^~~~~~~~~~~
include/linux/printk.h:508:9: note: in expansion of macro 'printk'
508 | printk(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__)
| ^~~~~~
kernel/bpf/btf.c:7749:25: note: in expansion of macro 'pr_warn'
7749 | pr_warn("allow module %s BTF mismatch, skip register %s\n",
| ^~~~~~~
kernel/bpf/btf.c:7753:77: error: invalid use of undefined type 'const struct module'
7753 | pr_err("missing module %s BTF, cannot register %s\n", module->name, msg);
| ^~
include/linux/printk.h:427:33: note: in definition of macro 'printk_index_wrap'
427 | _p_func(_fmt, ##__VA_ARGS__); \
| ^~~~~~~~~~~
include/linux/printk.h:498:9: note: in expansion of macro 'printk'
498 | printk(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
| ^~~~~~
kernel/bpf/btf.c:7753:17: note: in expansion of macro 'pr_err'
7753 | pr_err("missing module %s BTF, cannot register %s\n", module->name, msg);
| ^~~~~~
vim +7750 kernel/bpf/btf.c
7740
7741 static int register_check_missing_btf(const struct module *module, const char *msg)
7742 {
7743 if (!module && IS_ENABLED(CONFIG_DEBUG_INFO_BTF)) {
7744 pr_err("missing vmlinux BTF, cannot register %s\n", msg);
7745 return -ENOENT;
7746 }
7747 if (module && IS_ENABLED(CONFIG_DEBUG_INFO_BTF_MODULES)) {
7748 if (IS_ENABLED(CONFIG_MODULE_ALLOW_BTF_MISMATCH)) {
7749 pr_warn("allow module %s BTF mismatch, skip register %s\n",
> 7750 module->name, msg);
7751 return 0;
7752 }
7753 pr_err("missing module %s BTF, cannot register %s\n", module->name, msg);
7754 return -ENOENT;
7755 }
7756 return 0;
7757 }
7758
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
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