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libbpf: mark bpf_iter_num_{new,next,destroy} as __weak

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Mark bpf_iter_num_{new,next,destroy}() kfuncs declared for
bpf_for()/bpf_repeat() macros as __weak to allow users to feature-detect
their presence and guard bpf_for()/bpf_repeat() loops accordingly for
backwards compatibility with old kernels.

Now that libbpf supports kfunc calls poisoning and better reporting of
unresolved (but called) kfuncs, declaring number iterator kfuncs in
bpf_helpers.h won't degrade user experience and won't cause unnecessary
kernel feature dependencies.

Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/r/20230418002148.3255690-7-andrii@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Andrii Nakryiko 2023-04-17 17:21:48 -07:00 committed by Alexei Starovoitov
parent c5e6474167
commit 94dccba795
1 changed files with 3 additions and 3 deletions
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6
tools/lib/bpf/bpf_helpers.h
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@ -293,9 +293,9 @@ enum libbpf_tristate {
struct bpf_iter_num;
extern int bpf_iter_num_new(struct bpf_iter_num *it, int start, int end) __ksym;
extern int *bpf_iter_num_next(struct bpf_iter_num *it) __ksym;
extern void bpf_iter_num_destroy(struct bpf_iter_num *it) __ksym;
extern int bpf_iter_num_new(struct bpf_iter_num *it, int start, int end) __weak __ksym;
extern int *bpf_iter_num_next(struct bpf_iter_num *it) __weak __ksym;
extern void bpf_iter_num_destroy(struct bpf_iter_num *it) __weak __ksym;
#ifndef bpf_for_each
/* bpf_for_each(iter_type, cur_elem, args...) provides generic construct for