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Mon, 26 Oct 2026 12:03:29 +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 12:03:29 +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 0/4] s390: Consistent usage of text_mutex Date: Mon, 26 Oct 2026 13:03:25 +0100 Message-ID: <20261026120329.1792436-1-hca@linux.ibm.com> X-Mailer: git-send-email 2.53.0 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-Proofpoint-Spam-Info: AW1haW4tMjYxMDI2MDA0NiBTYWx0ZWRfX5hjzSWOV7u5v bYRL7voiqAi8YJ2GUihH+az9vaJdK1rlgfWPUMZQ5B1rBoHWYbcsZ5Eb8SEo5nF1mSr6Ug97ZrI Xbj3mv/D5jH6x8fGejTl0z3mJBz1p0k= X-Proofpoint-ORIG-GUID: bbuLSOFfmDkhpI9xqXS-OOb1-KkHk7h0 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYxMDI2MDA0NiBTYWx0ZWRfXyD7gtq6Zwb1v v3ndyJQrkGpylp/Rb5xfFP5tNCpCMf2M+iMHQDaq7H4ZSYTOIUsOxCWLR1QeeBFBLj1gz9H4AEv jJgKQEdl9jTTsTgRG9+/9EE1t4zmbU39SbCmkXoNkU+XMSilXaB/jzWHfMJoAfPgjZeTjyBl9dT NRneoJyaZmBHzbpFlbBpS9eUKKXKH2O6LUBKjGiN85d7xZVllenSg7XVA9j4gtoQVkuwCkpj+sj BdtSN4oVq9zRVZYzcXanKB0EJGrrvxHeGB62PUSJew58nVxUeNBlRnb+a+Q102rwhNOt+E48FWB HWLKaBue+q2Ap3+gvrcoTtGM+vqxavcuGvTLUY+CSrdoRhfGPU2VytX0HedpcNW96EkSG0T2GlH KjBch+04ZZj5XBsySlP5mvD8aHzc7yqSiUgVbiWCzaIYclF46BzcpM1Q9ritK1GM3auwlyoDAy9 ywCkaRA1nT6L/dCtTNA== X-Authority-Analysis: v=2.4 cv=G7uJgNk5 c=1 sm=1 tr=0 ts=6adf4196 cx=c_pps a=aDMHemPKRhS1OARIsFnwRA==:117 a=aDMHemPKRhS1OARIsFnwRA==:17 a=660iZSQnnn4A:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=Y2IxJ9c9Rs8Kov3niI8_:22 a=1VkLTK7BBF5flZQr4b0A:9 X-Proofpoint-GUID: bbuLSOFfmDkhpI9xqXS-OOb1-KkHk7h0 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 bulkscore=0 adultscore=0 impostorscore=0 suspectscore=0 clxscore=1015 phishscore=0 spamscore=0 malwarescore=0 lowpriorityscore=0 priorityscore=1501 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2610190000 definitions=main-2610260046 Other architectures serialize kernel text patching with text_mutex. s390 does not: __s390_kernel_write() relies on a private spinlock, and callers partially depend on implicit exclusion (e.g. no kprobe can be set on a jump label). Make s390 consistent with other architectures: - Patches 1-3 add text_mutex to the jump_label, ftrace and bpf text patching paths - Patch 4 removes the redundant spinlock from __s390_kernel_write(). CPU serialization, previously done implicitly, is now explicit via sync_core() Thanks, Heiko Heiko Carstens (4): s390/jump_label: Serialize text patching with text_mutex s390/ftrace: Serialize text patching with text_mutex s390/bpf: Serialize text patching with text_mutex s390/maccess: Remove spinlock from __s390_kernel_write() arch/s390/kernel/ftrace.c | 9 +++++++++ arch/s390/kernel/jump_label.c | 3 +++ arch/s390/mm/maccess.c | 9 ++++----- arch/s390/net/bpf_jit_comp.c | 21 +++++++++++++++++---- 4 files changed, 33 insertions(+), 9 deletions(-) -- 2.53.0