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Tue, 13 Jan 2026 14:18:52 -0800 (PST) From: Jiri Olsa X-Google-Original-From: Jiri Olsa Date: Tue, 13 Jan 2026 23:18:51 +0100 To: Eugene Loh Cc: song@kernel.org, ast@kernel.org, rostedt@goodmis.org, linux-kernel@vger.kernel.org, Kris Van Hees , Will Deacon Subject: Re: aarch64 missing from Revert "perf/x86: Always store regs->ip in perf_callchain_kernel()" Message-ID: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: On Mon, Jan 12, 2026 at 01:17:53AM -0500, Eugene Loh wrote: > Thanks for reverting that patch: > https://lore.kernel.org/r/20251104215405.168643-2-jolsa@kernel.org > https://github.com/torvalds/linux/commit/6d08340d1e354787d6c65a8c3cdd4d41ffb8a5ed >     Revert "perf/x86: Always store regs->ip in perf_callchain_kernel()" >     This reverts commit 83f44ae. hi, thanks for the report, I did not check aarch64, just x86_64 and there's even more fun with it: https://lore.kernel.org/bpf/20260112214940.1222115-1-jolsa@kernel.org/T/#mac207867799058c9b0cb273b09e9a2aaf552eebf > > But it seems to me that this issue is not specific to x86.  For example, > here is aarch64, using a 6.18 kernel: > >     # bpftrace -e 'tracepoint:sched:sched_process_exec { print(kstack()); }' > >         perf_trace_sched_process_exec+16 >         perf_trace_sched_process_exec+16 >         __traceiter_sched_process_exec+80 >         exec_binprm+908 >         bprm_execve.part.0+464 >         bprm_execve+68 >         do_execveat_common.isra.0+456 >         __arm64_sys_execve+76 >         invoke_syscall+112 >         el0_svc_common.constprop.0+264 >         do_el0_svc+36 >         el0_svc+56 >         el0t_64_sync_handler+184 >         el0t_64_sync+412 > > The leaf IP is repeated.  Are corresponding changes needed for processors > other than just x86? > probably.. I think it's very arch code that will need investigation from somebody fluent in aarch64, adding Will ;-) thanks, jirka