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Date: Wed, 29 Jan 2025 00:36:40 +0000
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From: "Ihor Solodrai" <ihor.solodrai@linux.dev>
Message-ID: <36780a0c327fe6fe0fee1c05ba04368e46d30a37@linux.dev>
TLS-Required: No
Subject: Re: [PATCH 1/2] s390: fgraph: Fix to remove
 ftrace_test_recursion_trylock()
To: "Masami Hiramatsu (Google)" <mhiramat@kernel.org>, "Steven Rostedt"
 <rostedt@goodmis.org>, "Heiko Carstens" <hca@linux.ibm.com>, "Sven
 Schnelle" <svens@linux.ibm.com>
Cc: "Jiri Olsa" <olsajiri@gmail.com>, "Masami Hiramatsu"
 <mhiramat@kernel.org>, "Mark Rutland" <mark.rutland@arm.com>, "Vasily
 Gorbik" <gor@linux.ibm.com>, "Alexander Gordeev"
 <agordeev@linux.ibm.com>, "Christian Borntraeger"
 <borntraeger@linux.ibm.com>, "Andrii Nakryiko"
 <andrii.nakryiko@gmail.com>, linux-kernel@vger.kernel.org,
 linux-trace-kernel@vger.kernel.org, linux-s390@vger.kernel.org, "bpf"
 <bpf@vger.kernel.org>
In-Reply-To: <173807817692.1854334.2985776940754607459.stgit@devnote2>
References: <173807816551.1854334.146350914633413330.stgit@devnote2>
 <173807817692.1854334.2985776940754607459.stgit@devnote2>
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January 28, 2025 at 7:29 AM, "Masami Hiramatsu (Google)" <mhiramat@kernel=
.org> wrote:



>=20
>=20From: Masami Hiramatsu (Google) <mhiramat@kernel.org>
>=20
>=20Fix to remove ftrace_test_recursion_trylock() from ftrace_graph_func(=
)
>=20
>=20because commit d576aec24df9 ("fgraph: Get ftrace recursion lock in
>=20
>=20function_graph_enter") has been moved it to function_graph_enter_regs=
()
>=20
>=20already.
>=20
>=20Reported-by: Jiri Olsa <olsajiri@gmail.com>
>=20
>=20Closes: https://lore.kernel.org/all/Z5O0shrdgeExZ2kF@krava/
>=20
>=20Fixes: d576aec24df9 ("fgraph: Get ftrace recursion lock in function_g=
raph_enter")
>=20
>=20Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
>=20
>=20Tested-by: Jiri Olsa <jolsa@kernel.org>
>=20
>=20[...]

Hi Masami,

Can confirm this patch fixes missed/kprobe_recursion BPF selftests on s39=
0x:
https://github.com/kernel-patches/vmtest/actions/runs/13021621468/job/363=
24248903

Tested-by: Ihor Solodrai <ihor.solodrai@linux.dev>

Thanks!