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Fri, 04 Sep 2026 12:51:37 -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.59.2026.09.04.12.51.36 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 04 Sep 2026 12:51:36 -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 2/7] bpf, x86: Use resolved pointer for timed may_goto Date: Fri, 4 Sep 2026 19:51:27 +0000 Message-ID: <20260904195132.141068-3-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. Use the pointer directly rather than adding it to RBP. This preserves the private-stack address selected by the JIT through R9. Fixes: 2fb761823ead ("bpf, x86: Add x86 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/ Signed-off-by: Siddharth Chintamaneni --- arch/x86/net/bpf_timed_may_goto.S | 6 ------ 1 file changed, 6 deletions(-) diff --git a/arch/x86/net/bpf_timed_may_goto.S b/arch/x86/net/bpf_timed_may_goto.S index 54c690cae190..6e9d9e7c2b1d 100644 --- a/arch/x86/net/bpf_timed_may_goto.S +++ b/arch/x86/net/bpf_timed_may_goto.S @@ -11,12 +11,6 @@ SYM_FUNC_START(arch_bpf_timed_may_goto) ANNOTATE_NOENDBR - /* - * r10 passes us stack depth, load the pointer to count and timestamp - * into r10 by adding it to BPF frame pointer. - */ - leaq (%rbp, %r10, 1), %r10 - /* Setup frame. */ pushq %rbp movq %rsp, %rbp -- 2.43.0