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Wed, 28 Oct 2026 10:50:24 +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 10:50:24 +0000 (GMT) Message-ID: <8310f115-2320-42f5-9dd8-f8f23c38a95d@linux.ibm.com> Date: Wed, 28 Oct 2026 11:50:24 +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 01/10] s390/jump_label: 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> <20261027143030.3154657-2-hca@linux.ibm.com> Content-Language: en-US From: Ilya Leoshkevich In-Reply-To: <20261027143030.3154657-2-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: AW1haW4tMjYxMDI4MDA0MiBTYWx0ZWRfX2p4eYJqOCLYI /qHrnahcczaK14tWRO07VUkOAwS3qHC7GIE7wGWSh9hCUlZvpwNYsxdZYe24mY0nz59cVoo0ZgO enxT58TueMzVkQgaF+BdGTT025BHPjg= X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYxMDI4MDA0MiBTYWx0ZWRfX/Uf+iT7IEI9F g169VpVjNFYZbr+uuHkuObBNqZxqAOiKZAC3/MtKlVQBgaFk76DPh7BwmMBYXwPGZ0hXYQcDQpJ H8VAcXt9F0GYCehuwIWAfGaV9mvwBUTkZ8BeqqCxu5wT+C1ZYnysOmPQpD1ZEJ3yEB8KbHbmvXL ybH76RnlTIcwbpWFz8hBVVi2L9ga/EiimKX55J8LEvHmQoVmD0fGtArY3RfzEA9+aKcCprVoAlr 6kdmwGz9sNRIaWVKNj9/YoQ3k74tJHuzAzLcsr4l2jN9pwfqsjuAt+6dyFkzn1kgCNH94XodseR CJBN3wAePny6hJ3eeitpa1oJrX9C/OwW9DbhTRbH/AJKKo/1L1n5lt48pdAu3Cwkw9dv01blRY8 Rk6N5TytEVHLI+lQ4szkhQEyVcwTT6rz1/2tOP93J4Ll0DyywS8mRJUEDUuxqpRxMrsgmL6r018 WzcQcWHEbpzAWIalinw== X-Proofpoint-ORIG-GUID: HQks9kt4WJ0cAxSJ3jj62Siu0AHcq824 X-Authority-Analysis: v=2.4 cv=Uu32pOwB c=1 sm=1 tr=0 ts=6ae1d376 cx=c_pps a=3Bg1Hr4SwmMryq2xdFQyZA==:117 a=3Bg1Hr4SwmMryq2xdFQyZA==:17 a=IkcTkHD0fZMA:10 a=660iZSQnnn4A:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=iQ6ETzBq9ecOQQE5vZCe:22 a=VnNF1IyMAAAA:8 a=X-ume5MsJspur9KCOK4A:9 a=QEXdDO2ut3YA:10 a=ZXulRonScM0A:10 a=zZCYzV9kfG8A:10 X-Proofpoint-GUID: HQks9kt4WJ0cAxSJ3jj62Siu0AHcq824 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: > Acquire text_mutex around the verify-then-patch sequence in > jump_label_transform(). This way s390 uses text_mutex like other > architectures and does not need to rely on other implicit semantics > (e.g. no kprobe can be set on a jump label). > > 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/jump_label.c | 2 ++ > 1 file changed, 2 insertions(+) Reviewed-by: Ilya Leoshkevich