[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <dfe0b9ba-828d-e1a5-f9a3-416c6b5b1cf3@efficios.com>
Date: Mon, 5 Dec 2022 16:46:18 -0500
From: Michael Jeanson <mjeanson@...icios.com>
To: Christophe Leroy <christophe.leroy@...roup.eu>,
Michael Ellerman <mpe@...erman.id.au>,
Steven Rostedt <rostedt@...dmis.org>
Cc: "stable@...r.kernel.org" <stable@...r.kernel.org>,
Masami Hiramatsu <mhiramat@...nel.org>,
Mark Rutland <mark.rutland@....com>,
Nicholas Piggin <npiggin@...il.com>,
Michal Suchanek <msuchanek@...e.de>,
"linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Subject: Re: [PATCH] powerpc/ftrace: fix syscall tracing on PPC64_ELF_ABI_V1
On 2022-12-05 15:11, Michael Jeanson wrote:
>>>> Michael Jeanson <mjeanson@...icios.com> writes:
>>>>> In v5.7 the powerpc syscall entry/exit logic was rewritten in C, on
>>>>> PPC64_ELF_ABI_V1 this resulted in the symbols in the syscall table
>>>>> changing from their dot prefixed variant to the non-prefixed ones.
>>>>>
>>>>> Since ftrace prefixes a dot to the syscall names when matching them to
>>>>> build its syscall event list, this resulted in no syscall events being
>>>>> available.
>>>>>
>>>>> Remove the PPC64_ELF_ABI_V1 specific version of
>>>>> arch_syscall_match_sym_name to have the same behavior across all powerpc
>>>>> variants.
>>>>
>>>> This doesn't seem to work for me.
>>>>
>>>> Event with it applied I still don't see anything in
>>>> /sys/kernel/debug/tracing/events/syscalls
>>>>
>>>> Did we break it in some other way recently?
>>>>
>>>> cheers
I did some further testing, my config also enabled KALLSYMS_ALL, when I remove
it there is indeed no syscall events.
Powered by blists - more mailing lists