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Mon, 26 Oct 2026 12:03:30 +0000 (GMT) Received: from tuxmaker.lnxne.boe (unknown [9.87.85.9]) by smtpav04.fra02v.mail.ibm.com (Postfix) with ESMTP; Mon, 26 Oct 2026 12:03:30 +0000 (GMT) From: Heiko Carstens To: Alexander Gordeev , Sven Schnelle , Vasily Gorbik , Christian Borntraeger , Ilya Leoshkevich Cc: linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org Subject: [PATCH 2/4] s390/ftrace: Serialize text patching with text_mutex Date: Mon, 26 Oct 2026 13:03:27 +0100 Message-ID: <20261026120329.1792436-3-hca@linux.ibm.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20261026120329.1792436-1-hca@linux.ibm.com> References: <20261026120329.1792436-1-hca@linux.ibm.com> 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 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Authority-Analysis: v=2.4 cv=P8SvFSAu c=1 sm=1 tr=0 ts=6adf4197 cx=c_pps a=3Bg1Hr4SwmMryq2xdFQyZA==:117 a=3Bg1Hr4SwmMryq2xdFQyZA==:17 a=660iZSQnnn4A:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=RzCfie-kr_QcCd8fBx8p:22 a=VnNF1IyMAAAA:8 a=Du24JD4PTAPhdpIohfsA:9 X-Proofpoint-GUID: UPFazb4qzPapHLVQoFZ2BFcanaw_wueu X-Proofpoint-Spam-Info: AW1haW4tMjYxMDI2MDA0NiBTYWx0ZWRfX//1KUtc6/DjP 2/L/6H3C6mNa+ikFPlRigChFYHU19LWZgd7sQUlPajApaDDCPT6LHU0UWsGAZc/SMOqOLHrR9t+ hN1gGpMrZayCl24fOxPT7KbpsADCG0E= X-Proofpoint-ORIG-GUID: UPFazb4qzPapHLVQoFZ2BFcanaw_wueu X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYxMDI2MDA0NiBTYWx0ZWRfX+Aw73kBfRJzH dNwEJNqohTLYHNnfVrOx8HENYjjnZroLM0eEKZzCmm47BpPmGxPkbXe3OVhigN5wTSpoCyltPSY q7IGZtQJwP4UTLhqVoTy6bZr/pe+1R35VExruQHZ2/jZ5x6tMBaQKmkOcxDeuKy0O6UjH7rx8wB ib8vXxsjytbxuuEa5cv+Qno4Z7m4901CaWrI4v/8vLGXBFARCQnqWfprgbJ8hbBFQttyXs4+LGS nKTe7+plaLLAT1OSwK15pO35UtamTsGObD2JEt7XpuMCwlE527FIyRKnKAtBrxDT0IDixMZMgXP YquwY4/EzC6BCfGLExZVvnt6srr/7xJzX9ZCcq79xBiI7cq8WbcDUmTB1k1yK3XLvPqDlwTYfsN 5WLcFoDTKjwsinsNLfmCs+XwGSLlYaU6GdMCR72qcPFkmG6TAzIFNklZssaFHAqBZ3Dzl2oUIL5 BwjMgXZFNEiP2zz7QAA== 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=2026-10-26_02,2026-10-21_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 adultscore=0 malwarescore=0 phishscore=0 spamscore=0 clxscore=1015 bulkscore=0 suspectscore=0 priorityscore=1501 lowpriorityscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2610190000 definitions=main-2610260046 Add ftrace_arch_code_modify_prepare() and extend ftrace_arch_code_modify_post_process() to acquire and release text_mutex around the ftrace code modification pass. This way s390 uses text_mutex like e.g. x86 and riscv. This is a prereq for removing the spinlock in __s390_kernel_write(). Signed-off-by: Heiko Carstens --- arch/s390/kernel/ftrace.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/arch/s390/kernel/ftrace.c b/arch/s390/kernel/ftrace.c index e94bb98f5231..772dbdcc51f2 100644 --- a/arch/s390/kernel/ftrace.c +++ b/arch/s390/kernel/ftrace.c @@ -8,6 +8,7 @@ */ #include +#include #include #include #include @@ -247,13 +248,21 @@ int ftrace_update_ftrace_func(ftrace_func_t func) return 0; } +void ftrace_arch_code_modify_prepare(void) + __acquires(&text_mutex) +{ + mutex_lock(&text_mutex); +} + void arch_ftrace_update_code(int command) { ftrace_modify_all_code(command); } void ftrace_arch_code_modify_post_process(void) + __releases(&text_mutex) { + mutex_unlock(&text_mutex); /* * Flush any pre-fetched instructions on all * CPUs to make the new code visible. -- 2.53.0