From: Ilya Leoshkevich <iii@linux.ibm.com>
To: Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Andrii Nakryiko <andrii@kernel.org>
Cc: bpf@vger.kernel.org, Heiko Carstens <hca@linux.ibm.com>,
Vasily Gorbik <gor@linux.ibm.com>,
Alexander Gordeev <agordeev@linux.ibm.com>,
Ilya Leoshkevich <iii@linux.ibm.com>
Subject: [PATCH bpf-next 0/2] s390/bpf: Write back the tail call counter
Date: Tue, 12 Aug 2025 16:07:50 +0200 [thread overview]
Message-ID: <20250812141217.144551-1-iii@linux.ibm.com> (raw)
Hi,
This series fixes the tailcall_bpf2bpf_hierarchy test failures on s390.
It takes a simpler approach than x86_64 and aarch64: instead of
introducing a pointer to the tail call counter, it copies the updated
value back from the callee's frame to the caller's frame. This needs to
be done in two locations: after BPF_CALL and after
BPF_TRAMP_F_CALL_ORIG.
Best regards,
Ilya
Ilya Leoshkevich (2):
s390/bpf: Write back the tail call counter for BPF_CALL
s390/bpf: Write back the tail call counter for BPF_TRAMP_F_CALL_ORIG
arch/s390/net/bpf_jit_comp.c | 23 ++++++++++++++++-------
1 file changed, 16 insertions(+), 7 deletions(-)
--
2.50.1
next reply other threads:[~2025-08-12 14:12 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-08-12 14:07 Ilya Leoshkevich [this message]
2025-08-12 14:07 ` [PATCH bpf-next 1/2] s390/bpf: Write back the tail call counter for BPF_CALL Ilya Leoshkevich
2025-08-12 16:00 ` Ilya Leoshkevich
2025-08-12 14:07 ` [PATCH bpf-next 2/2] s390/bpf: Write back the tail call counter for BPF_TRAMP_F_CALL_ORIG Ilya Leoshkevich
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