Re: [PATCH bpf-next v2 4/6] bpf: Introduce css_descendant open-coded iterator kfuncs

From: kernel test robot
Date: Wed Sep 13 2023 - 05:15:11 EST

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Hi Chuyi,

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/Chuyi-Zhou/cgroup-Prepare-for-using-css_task_iter_-in-BPF/20230912-150454
base: https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master
patch link: https://lore.kernel.org/r/20230912070149.969939-5-zhouchuyi%40bytedance.com
patch subject: [PATCH bpf-next v2 4/6] bpf: Introduce css_descendant open-coded iterator kfuncs
config: arm-randconfig-r032-20230913 (https://download.01.org/0day-ci/archive/20230913/202309131634.hJlxw7NA-lkp@xxxxxxxxx/config)
compiler: clang version 17.0.0 (https://github.com/llvm/llvm-project.git 4a5ac14ee968ff0ad5d2cc1ffa0299048db4c88a)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20230913/202309131634.hJlxw7NA-lkp@xxxxxxxxx/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@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202309131634.hJlxw7NA-lkp@xxxxxxxxx/

All errors (new ones prefixed by >>):

kernel/bpf/task_iter.c:810:17: warning: no previous prototype for function 'bpf_iter_css_task_new' [-Wmissing-prototypes]
810 | __bpf_kfunc int bpf_iter_css_task_new(struct bpf_iter_css_task *it,
| ^
kernel/bpf/task_iter.c:810:13: note: declare 'static' if the function is not intended to be used outside of this translation unit
810 | __bpf_kfunc int bpf_iter_css_task_new(struct bpf_iter_css_task *it,
| ^
| static
kernel/bpf/task_iter.c:835:33: warning: no previous prototype for function 'bpf_iter_css_task_next' [-Wmissing-prototypes]
835 | __bpf_kfunc struct task_struct *bpf_iter_css_task_next(struct bpf_iter_css_task *it)
| ^
kernel/bpf/task_iter.c:835:13: note: declare 'static' if the function is not intended to be used outside of this translation unit
835 | __bpf_kfunc struct task_struct *bpf_iter_css_task_next(struct bpf_iter_css_task *it)
| ^
| static
kernel/bpf/task_iter.c:844:18: warning: no previous prototype for function 'bpf_iter_css_task_destroy' [-Wmissing-prototypes]
844 | __bpf_kfunc void bpf_iter_css_task_destroy(struct bpf_iter_css_task *it)
| ^
kernel/bpf/task_iter.c:844:13: note: declare 'static' if the function is not intended to be used outside of this translation unit
844 | __bpf_kfunc void bpf_iter_css_task_destroy(struct bpf_iter_css_task *it)
| ^
| static
kernel/bpf/task_iter.c:858:17: warning: no previous prototype for function 'bpf_iter_process_new' [-Wmissing-prototypes]
858 | __bpf_kfunc int bpf_iter_process_new(struct bpf_iter_process *it)
| ^
kernel/bpf/task_iter.c:858:13: note: declare 'static' if the function is not intended to be used outside of this translation unit
858 | __bpf_kfunc int bpf_iter_process_new(struct bpf_iter_process *it)
| ^
| static
kernel/bpf/task_iter.c:870:33: warning: no previous prototype for function 'bpf_iter_process_next' [-Wmissing-prototypes]
870 | __bpf_kfunc struct task_struct *bpf_iter_process_next(struct bpf_iter_process *it)
| ^
kernel/bpf/task_iter.c:870:13: note: declare 'static' if the function is not intended to be used outside of this translation unit
870 | __bpf_kfunc struct task_struct *bpf_iter_process_next(struct bpf_iter_process *it)
| ^
| static
kernel/bpf/task_iter.c:879:18: warning: no previous prototype for function 'bpf_iter_process_destroy' [-Wmissing-prototypes]
879 | __bpf_kfunc void bpf_iter_process_destroy(struct bpf_iter_process *it)
| ^
kernel/bpf/task_iter.c:879:13: note: declare 'static' if the function is not intended to be used outside of this translation unit
879 | __bpf_kfunc void bpf_iter_process_destroy(struct bpf_iter_process *it)
| ^
| static
kernel/bpf/task_iter.c:888:17: warning: no previous prototype for function 'bpf_iter_css_pre_new' [-Wmissing-prototypes]
888 | __bpf_kfunc int bpf_iter_css_pre_new(struct bpf_iter_css_pre *it,
| ^
kernel/bpf/task_iter.c:888:13: note: declare 'static' if the function is not intended to be used outside of this translation unit
888 | __bpf_kfunc int bpf_iter_css_pre_new(struct bpf_iter_css_pre *it,
| ^
| static
kernel/bpf/task_iter.c:900:41: warning: no previous prototype for function 'bpf_iter_css_pre_next' [-Wmissing-prototypes]
900 | __bpf_kfunc struct cgroup_subsys_state *bpf_iter_css_pre_next(struct bpf_iter_css_pre *it)
| ^
kernel/bpf/task_iter.c:900:13: note: declare 'static' if the function is not intended to be used outside of this translation unit
900 | __bpf_kfunc struct cgroup_subsys_state *bpf_iter_css_pre_next(struct bpf_iter_css_pre *it)
| ^
| static
kernel/bpf/task_iter.c:908:18: warning: no previous prototype for function 'bpf_iter_css_pre_destroy' [-Wmissing-prototypes]
908 | __bpf_kfunc void bpf_iter_css_pre_destroy(struct bpf_iter_css_pre *it)
| ^
kernel/bpf/task_iter.c:908:13: note: declare 'static' if the function is not intended to be used outside of this translation unit
908 | __bpf_kfunc void bpf_iter_css_pre_destroy(struct bpf_iter_css_pre *it)
| ^
| static
kernel/bpf/task_iter.c:912:17: warning: no previous prototype for function 'bpf_iter_css_post_new' [-Wmissing-prototypes]
912 | __bpf_kfunc int bpf_iter_css_post_new(struct bpf_iter_css_post *it,
| ^
kernel/bpf/task_iter.c:912:13: note: declare 'static' if the function is not intended to be used outside of this translation unit
912 | __bpf_kfunc int bpf_iter_css_post_new(struct bpf_iter_css_post *it,
| ^
| static
kernel/bpf/task_iter.c:924:41: warning: no previous prototype for function 'bpf_iter_css_post_next' [-Wmissing-prototypes]
924 | __bpf_kfunc struct cgroup_subsys_state *bpf_iter_css_post_next(struct bpf_iter_css_post *it)
| ^
kernel/bpf/task_iter.c:924:13: note: declare 'static' if the function is not intended to be used outside of this translation unit
924 | __bpf_kfunc struct cgroup_subsys_state *bpf_iter_css_post_next(struct bpf_iter_css_post *it)
| ^
| static
kernel/bpf/task_iter.c:932:18: warning: no previous prototype for function 'bpf_iter_css_post_destroy' [-Wmissing-prototypes]
932 | __bpf_kfunc void bpf_iter_css_post_destroy(struct bpf_iter_css_post *it)
| ^
kernel/bpf/task_iter.c:932:13: note: declare 'static' if the function is not intended to be used outside of this translation unit
932 | __bpf_kfunc void bpf_iter_css_post_destroy(struct bpf_iter_css_post *it)
| ^
| static
>> kernel/bpf/task_iter.c:893:2: error: call to '__compiletime_assert_389' declared with 'error' attribute: BUILD_BUG_ON failed: sizeof(struct bpf_iter_css_kern) != sizeof(struct bpf_iter_css_pre)
893 | BUILD_BUG_ON(sizeof(struct bpf_iter_css_kern) != sizeof(struct bpf_iter_css_pre));
| ^
include/linux/build_bug.h:50:2: note: expanded from macro 'BUILD_BUG_ON'
50 | BUILD_BUG_ON_MSG(condition, "BUILD_BUG_ON failed: " #condition)
| ^
include/linux/build_bug.h:39:37: note: expanded from macro 'BUILD_BUG_ON_MSG'
39 | #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
| ^
include/linux/compiler_types.h:425:2: note: expanded from macro 'compiletime_assert'
425 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
| ^
include/linux/compiler_types.h:413:2: note: expanded from macro '_compiletime_assert'
413 | __compiletime_assert(condition, msg, prefix, suffix)
| ^
include/linux/compiler_types.h:406:4: note: expanded from macro '__compiletime_assert'
406 | prefix ## suffix(); \
| ^
<scratch space>:6:1: note: expanded from here
6 | __compiletime_assert_389
| ^
>> kernel/bpf/task_iter.c:917:2: error: call to '__compiletime_assert_391' declared with 'error' attribute: BUILD_BUG_ON failed: sizeof(struct bpf_iter_css_kern) != sizeof(struct bpf_iter_css_post)
917 | BUILD_BUG_ON(sizeof(struct bpf_iter_css_kern) != sizeof(struct bpf_iter_css_post));
| ^
include/linux/build_bug.h:50:2: note: expanded from macro 'BUILD_BUG_ON'
50 | BUILD_BUG_ON_MSG(condition, "BUILD_BUG_ON failed: " #condition)
| ^
include/linux/build_bug.h:39:37: note: expanded from macro 'BUILD_BUG_ON_MSG'
39 | #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
| ^
include/linux/compiler_types.h:425:2: note: expanded from macro 'compiletime_assert'
425 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
| ^
include/linux/compiler_types.h:413:2: note: expanded from macro '_compiletime_assert'
413 | __compiletime_assert(condition, msg, prefix, suffix)
| ^
include/linux/compiler_types.h:406:4: note: expanded from macro '__compiletime_assert'
406 | prefix ## suffix(); \
| ^
<scratch space>:14:1: note: expanded from here
14 | __compiletime_assert_391
| ^
12 warnings and 2 errors generated.

vim +893 kernel/bpf/task_iter.c

887
888 __bpf_kfunc int bpf_iter_css_pre_new(struct bpf_iter_css_pre *it,
889 struct cgroup_subsys_state *root)
890 {
891 struct bpf_iter_css_kern *kit = (void *)it;
892
> 893 BUILD_BUG_ON(sizeof(struct bpf_iter_css_kern) != sizeof(struct bpf_iter_css_pre));
894 BUILD_BUG_ON(__alignof__(struct bpf_iter_css_kern) != __alignof__(struct bpf_iter_css_pre));
895 kit->root = root;
896 kit->pos = NULL;
897 return 0;
898 }
899
900 __bpf_kfunc struct cgroup_subsys_state *bpf_iter_css_pre_next(struct bpf_iter_css_pre *it)
901 {
902 struct bpf_iter_css_kern *kit = (void *)it;
903
904 kit->pos = css_next_descendant_pre(kit->pos, kit->root);
905 return kit->pos;
906 }
907
908 __bpf_kfunc void bpf_iter_css_pre_destroy(struct bpf_iter_css_pre *it)
909 {
910 }
911
912 __bpf_kfunc int bpf_iter_css_post_new(struct bpf_iter_css_post *it,
913 struct cgroup_subsys_state *root)
914 {
915 struct bpf_iter_css_kern *kit = (void *)it;
916
> 917 BUILD_BUG_ON(sizeof(struct bpf_iter_css_kern) != sizeof(struct bpf_iter_css_post));
918 BUILD_BUG_ON(__alignof__(struct bpf_iter_css_kern) != __alignof__(struct bpf_iter_css_post));
919 kit->root = root;
920 kit->pos = NULL;
921 return 0;
922 }
923

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Next message: Peter Ujfalusi: "[PATCH] ASoC: hdac_hdmi: Remove temporary string use in create_fill_jack_kcontrols"
Previous message: Bryan O'Donoghue: "Re: [PATCH 4/9] arm64: dts: qcom: msm8916: Reserve firmware memory dynamically"
In reply to: kernel test robot: "Re: [PATCH bpf-next v2 4/6] bpf: Introduce css_descendant open-coded iterator kfuncs"
Next in thread: Andrii Nakryiko: "Re: [PATCH bpf-next v2 4/6] bpf: Introduce css_descendant open-coded iterator kfuncs"
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