BPF selftests compilation failure due to selftests-bpf-initialize-operation-name-before-use.patch

BPF selftests compilation failure due to selftests-bpf-initialize-operation-name-before-use.patch

[Shung-Hsi Yu]

Hi Sasha,

I am running into BPF selftests compilation error on 6.18 (but it
possibly affect other branches as well, haven't check) due to
selftests-bpf-initialize-operation-name-before-use.patch currently
sitting in stable-queue:

/tmp/work/linux-stable/linux-stable/tools/testing/selftests/bpf/prog_tests/verifier_log.c: In function ‘verif_btf_log_subtest’:
/tmp/work/linux-stable/linux-stable/tools/testing/selftests/bpf/prog_tests/verifier_log.c:320:9: error: implicit declaration of function ‘strscpy’; did you mean ‘strlcpy’? [-Werror=implicit-function-declaration]
  320 |         strscpy(op_name, "log_fixed", sizeof(op_name));
      |         ^~~~~~~
      |         strlcpy

Can you pick up commit 63c49efc987a ("selftests/bpf: Add simple
strscpy() implementation") along? I think that should be enough to fix
the build failure.

Re: BPF selftests compilation failure due to selftests-bpf-initialize-operation-name-before-use.patch

[Greg KH]

On Tue, Jul 21, 2026 at 03:21:55PM +0800, Shung-Hsi Yu wrote:
> Hi Sasha,
> 
> I am running into BPF selftests compilation error on 6.18 (but it
> possibly affect other branches as well, haven't check) due to
> selftests-bpf-initialize-operation-name-before-use.patch currently
> sitting in stable-queue:
> 
> /tmp/work/linux-stable/linux-stable/tools/testing/selftests/bpf/prog_tests/verifier_log.c: In function ‘verif_btf_log_subtest’:
> /tmp/work/linux-stable/linux-stable/tools/testing/selftests/bpf/prog_tests/verifier_log.c:320:9: error: implicit declaration of function ‘strscpy’; did you mean ‘strlcpy’? [-Werror=implicit-function-declaration]
>   320 |         strscpy(op_name, "log_fixed", sizeof(op_name));
>       |         ^~~~~~~
>       |         strlcpy
> 
> Can you pick up commit 63c49efc987a ("selftests/bpf: Add simple
> strscpy() implementation") along? I think that should be enough to fix
> the build failure.

Now applied, thanks.

greg k-h

Re: BPF selftests compilation failure due to selftests-bpf-initialize-operation-name-before-use.patch

[Sasha Levin]

> Can you pick up commit 63c49efc987a ("selftests/bpf: Add simple
> strscpy() implementation") along? I think that should be enough to fix
> the build failure.

Greg has already picked it up for 6.18, which covers the tree you hit.

The offending selftests patch is also queued for 6.12 and 6.6, and you
were right that they're affected too. Unfortunately 63c49efc987a
doesn't apply there as-is: it depends on 9a6a6a319157 ("tools/testing:
add linux/args.h header and fix radix, VMA tests"), which isn't in
either tree.

Could you send adapted backports of the strscpy helper for 6.12.y and
6.6.y? I'll hold off on those branches until then.

-- 
Thanks,
Sasha

Re: BPF selftests compilation failure due to selftests-bpf-initialize-operation-name-before-use.patch

[Shung-Hsi Yu]

On Tue, Jul 21, 2026 at 08:53:58PM -0400, Sasha Levin wrote:
> > Can you pick up commit 63c49efc987a ("selftests/bpf: Add simple
> > strscpy() implementation") along? I think that should be enough to fix
> > the build failure.
> 
> Greg has already picked it up for 6.18, which covers the tree you hit.
> 
> The offending selftests patch is also queued for 6.12 and 6.6, and you were right that they're affected too. Unfortunately 63c49efc987a doesn't apply there as-is: it depends on 9a6a6a319157 ("tools/testing: add linux/args.h header and fix radix, VMA tests"), which isn't in either tree.
> 
> Could you send adapted backports of the strscpy helper for 6.12.y and
> 6.6.y? I'll hold off on those branches until then.

Ack, I can give it a try.