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Fri, 04 Sep 2026 12:51:41 -0700 (PDT) Received: from sid-dev-env.cgrhrlrrq2nuffriizdlnb1x4b.xx.internal.cloudapp.net ([4.155.54.158]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-8615404876fsm1497684b3a.59.2026.09.04.12.51.40 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 04 Sep 2026 12:51:41 -0700 (PDT) From: Siddharth Chintamaneni To: bpf@vger.kernel.org Cc: Siddharth Chintamaneni , Jeremy Jean , Alexei Starovoitov , Daniel Borkmann , John Fastabend , Andrii Nakryiko , Eduard Zingerman , Kumar Kartikeya Dwivedi , Martin KaFai Lau , Song Liu , Yonghong Song , Jiri Olsa , Emil Tsalapatis , Ihor Solodrai , Anton Protopopov , Puranjay Mohan , linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org, linux-riscv@lists.infradead.org, rlmenge@gmail.com, hargar@linux.microsoft.com, apais@microsoft.com Subject: [PATCH bpf-next v1 6/7] bpf, s390: Use resolved pointer for timed may_goto Date: Fri, 4 Sep 2026 19:51:31 +0000 Message-ID: <20260904195132.141068-7-sidchintamaneni@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260904195132.141068-1-sidchintamaneni@gmail.com> References: <20260904195132.141068-1-sidchintamaneni@gmail.com> X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit The timed may_goto fixup now passes the resolved counter pointer through BPF_REG_AX instead of a stack offset and BPF frame pointer pair. Copy the pointer directly into the first argument register and update the special calling convention documentation. Fixes: b8efa810c1db ("s390/bpf: Add s390 JIT support for timed may_goto") Reported-by: Jeremy Jean Link: https://lore.kernel.org/all/20260824213158.3755932-2-Jeremy.Jean@oss.cyber.gouv.fr/ Assisted-by: Copilot:gpt-5.6-sol Signed-off-by: Siddharth Chintamaneni --- arch/s390/net/bpf_jit_comp.c | 6 +++--- arch/s390/net/bpf_timed_may_goto.S | 8 ++++---- 2 files changed, 7 insertions(+), 7 deletions(-) diff --git a/arch/s390/net/bpf_jit_comp.c b/arch/s390/net/bpf_jit_comp.c index c46872b071ce..4098c3377c21 100644 --- a/arch/s390/net/bpf_jit_comp.c +++ b/arch/s390/net/bpf_jit_comp.c @@ -1872,9 +1872,9 @@ static noinline int bpf_jit_insn(struct bpf_jit *jit, struct bpf_prog *fp, if ((void *)func == arch_bpf_timed_may_goto) { /* * arch_bpf_timed_may_goto() has a special ABI: the - * parameters are in BPF_REG_AX and BPF_REG_10; the - * return value is in BPF_REG_AX; and all GPRs except - * REG_W0, REG_W1, and BPF_REG_AX are callee-saved. + * parameter and return value are in BPF_REG_AX; all + * GPRs except REG_W0, REG_W1, and BPF_REG_AX are + * callee-saved. */ /* brasl %r0,func */ diff --git a/arch/s390/net/bpf_timed_may_goto.S b/arch/s390/net/bpf_timed_may_goto.S index 06f567a460d7..e34c99982c4a 100644 --- a/arch/s390/net/bpf_timed_may_goto.S +++ b/arch/s390/net/bpf_timed_may_goto.S @@ -21,9 +21,9 @@ SYM_FUNC_START(arch_bpf_timed_may_goto) /* - * This function has a special ABI: the parameters are in %r12 and - * %r13; the return value is in %r12; all GPRs except %r0, %r1, and - * %r12 are callee-saved; and the return address is in %r0. + * This function has a special ABI: the parameter and return value are + * in %r12; all GPRs except %r0, %r1, and %r12 are callee-saved; and + * the return address is in %r0. */ stmg %r2,%r5,FRAME_OFF+R2_OFF(%r15) stg %r14,FRAME_OFF+R14_OFF(%r15) @@ -33,7 +33,7 @@ SYM_FUNC_START(arch_bpf_timed_may_goto) lay %r15,-FRAME_SIZE(%r15) stg %r1,__SF_BACKCHAIN(%r15) - lay %r2,0(%r12,%r13) + lgr %r2,%r12 brasl %r14,bpf_check_timed_may_goto lgr %r12,%r2 -- 2.43.0