Public bug reported:
Previously, bpf_dynptr_slice() functions prototype was included in
the auto-generated vmlinux.h header functions. But with recent updates
(from 6.17.0-10.10 to 6.17.0-11.11) bpftool doesn't put the prototype
for bpf_dynptr_slice() into vmlinux.h even though the function is
included in .BTF section. This results in the following compilation
error:
CLNG-BPF [test_progs] dynptr_success.bpf.o
make[1]: Leaving directory
'/home/ubuntu/autotest/client/tmp/ubuntu_bpf/src/linux/tools/testing/selftests/bpf'
make: Leaving directory
'/home/ubuntu/autotest/client/tmp/ubuntu_bpf/src/linux/tools/testing/selftests'
stderr:
progs/dynptr_success.c:524:9: error: call to undeclared function
'bpf_dynptr_slice'; ISO C99 and later do not support implicit function
declarations [-Wimplicit-function-declaration]
524 | data = bpf_dynptr_slice(&ptr, 0, NULL, 1);
| ^
progs/dynptr_success.c:524:9: note: did you mean 'bpf_dynptr_size'?
/home/ubuntu/autotest/client/tmp/ubuntu_bpf/src/linux/tools/testing/selftests/bpf/tools/include/vmlinux.h:162097:14:
note: 'bpf_dynptr_size' declared here
162097 | extern __u32 bpf_dynptr_size(const struct bpf_dynptr *p) __weak __ksym;
| ^
progs/dynptr_success.c:524:7: error: incompatible integer to pointer conversion
assigning to '__u64 *' (aka 'unsigned long long *') from 'int'
[-Wint-conversion]
524 | data = bpf_dynptr_slice(&ptr, 0, NULL, 1);
| ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
progs/dynptr_success.c:541:9: error: call to undeclared function
'bpf_dynptr_slice'; ISO C99 and later do not support implicit function
declarations [-Wimplicit-function-declaration]
541 | data = bpf_dynptr_slice(&ptr, 0, NULL, 10);
| ^
progs/dynptr_success.c:541:7: error: incompatible integer to pointer conversion
assigning to 'char *' from 'int' [-Wint-conversion]
541 | data = bpf_dynptr_slice(&ptr, 0, NULL, 10);
| ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
4 errors generated.
make[1]: *** [Makefile:733:
/home/ubuntu/autotest/client/tmp/ubuntu_bpf/src/linux/tools/testing/selftests/bpf/dynptr_success.bpf.o]
Error 1
make: *** [Makefile:208: all] Error 2
Straightforward fix is to include "bpf_kfuncs.h" in dynptr_success.c
as is done in dynptr_fail.c.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Affects: linux (Ubuntu Questing)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Questing)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2138361
Title:
questing selftests/bpf:setup dynptr_success.c compilation issue
bpf_dynptr_slice undefined
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