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Wed, 28 Oct 2026 10:54:39 +0000 (GMT) Received: from [0.0.0.0] (unknown [9.111.73.9]) by smtpav06.fra02v.mail.ibm.com (Postfix) with ESMTP; Wed, 28 Oct 2026 10:54:39 +0000 (GMT) Message-ID: <22f1a455-fc80-4a0c-aa44-a347710bacaa@linux.ibm.com> Date: Wed, 28 Oct 2026 11:54:38 +0100 X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 02/10] s390/ftrace: Serialize text patching with text_mutex To: Heiko Carstens , Alexander Gordeev , Sven Schnelle , Vasily Gorbik , Christian Borntraeger Cc: linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org References: <20261027143030.3154657-1-hca@linux.ibm.com> <20261027143030.3154657-3-hca@linux.ibm.com> Content-Language: en-US From: Ilya Leoshkevich In-Reply-To: <20261027143030.3154657-3-hca@linux.ibm.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 X-Proofpoint-Spam-Info: AW1haW4tMjYxMDI4MDA0MiBTYWx0ZWRfX9nSjiuhgBTnj RJJuVqhs6Xo6N2gfUZQrlU1esm6kjRbR3EdyApDGtXGxbOp0KcN6Vub+GavQLoYpI1AtEA7ZoCj TybrfGdPeqtRtyVhVGnXVTkEhxmHByw= X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYxMDI4MDA0MiBTYWx0ZWRfXzhCnfIeyHmjw HrkWd202zoKPaj5vUXzKxqglJZFMeJvddn5WczNCpTYCId7TfPgANnWaqWYelWULOWF/saiVdVr EAvNNzOqdRGR/FXgWUezEBpKD5w6OAeIIjGH3imHxubTslsfgydKDbIbxCdyE2rD+AgrMB1JwkB nxUEKNBAFyqYr03TDX/R/MdU21spCzpJV6bqpK8UjMjFosgtE3eVrNbXlhvxmqcFievpATNA+2/ KGjjoDKT4NeS1o35gvvUv6iwWpDCaGTQihnkwrJeBn1v54ufHvb46+hVxRmewXya3oPNOOaIIrd 2BUgnFBUGc9oC9c/xd6/2RTp3QkmHeXZwtMVvbHqeE8fAdCJSY91yE8EPUykSL/S1emRVAVCgmk IJCX2BXp2A5cPnuOfn7yxVC+8+4TmwL5ENH0qAudBt70N+bN9rX6hGyP4ckwciwGibcDG/qK/Uv XP35uAKKtR39vsEqBmw== X-Proofpoint-ORIG-GUID: GvLdZekchwy3P3mQvlWPG63oRmcYniXy X-Authority-Analysis: v=2.4 cv=Uu32pOwB c=1 sm=1 tr=0 ts=6ae1d474 cx=c_pps a=bLidbwmWQ0KltjZqbj+ezA==:117 a=bLidbwmWQ0KltjZqbj+ezA==:17 a=IkcTkHD0fZMA:10 a=660iZSQnnn4A:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=iQ6ETzBq9ecOQQE5vZCe:22 a=VnNF1IyMAAAA:8 a=wXU5UHentgW_jQT7nqkA:9 a=QEXdDO2ut3YA:10 a=ZXulRonScM0A:10 X-Proofpoint-GUID: GvLdZekchwy3P3mQvlWPG63oRmcYniXy X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.138,FMLib:17.12.100.49 definitions=2026-10-28_03,2026-10-21_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 impostorscore=0 priorityscore=1501 spamscore=0 adultscore=0 lowpriorityscore=0 malwarescore=0 clxscore=1015 suspectscore=0 phishscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2610190000 definitions=main-2610280042 On 10/27/26 15:30, Heiko Carstens wrote: > Add ftrace_arch_code_modify_prepare() and extend > ftrace_arch_code_modify_post_process() to acquire and release > text_mutex when ftrace code is modified. > > Also add locking to ftrace_init_nop(). This way s390 uses text_mutex > like e.g. x86 and riscv. > > This is part of larger series where at the end s390_kernel_write() > requires that callers hold text_mutex for serialization. > > Signed-off-by: Heiko Carstens > --- > arch/s390/kernel/ftrace.c | 11 +++++++++++ > 1 file changed, 11 insertions(+) Reviewed-by: Ilya Leoshkevich