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Wed, 28 Oct 2026 11:09:27 +0000 (GMT) Received: from osiris (unknown [9.68.31.201]) by smtpav02.fra02v.mail.ibm.com (Postfix) with ESMTPS; Wed, 28 Oct 2026 11:09:27 +0000 (GMT) Date: Wed, 28 Oct 2026 12:09:26 +0100 From: Heiko Carstens To: Ilya Leoshkevich Cc: Alexander Gordeev , Sven Schnelle , Vasily Gorbik , Christian Borntraeger , linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org Subject: Re: [PATCH v2 04/10] s390/runtime-const: Serialize text patching with text_mutex Message-ID: <20261028110926.8417C5c-hca@linux.ibm.com> References: <20261027143030.3154657-1-hca@linux.ibm.com> <20261027143030.3154657-5-hca@linux.ibm.com> <034dc4fa-520b-4ad5-9d9d-8ae469692698@linux.ibm.com> X-Mailing-List: linux-s390@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <034dc4fa-520b-4ad5-9d9d-8ae469692698@linux.ibm.com> X-TM-AS-GCONF: 00 X-Authority-Analysis: v=2.4 cv=BOMmP1QG c=1 sm=1 tr=0 ts=6ae1d7ec cx=c_pps a=bLidbwmWQ0KltjZqbj+ezA==:117 a=bLidbwmWQ0KltjZqbj+ezA==:17 a=kj9zAlcOel0A:10 a=660iZSQnnn4A:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=V8glGbnc2Ofi9Qvn3v5h:22 a=SoOlLlOYVDHFfBhTSR0A:9 a=CjuIK1q_8ugA:10 X-Proofpoint-ORIG-GUID: qHb4vcB2bfdmTTQjx5QKVEmqlX_bMzjI X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYxMDI4MDA0MiBTYWx0ZWRfX4YwjaWp2HCav Rgx+O5aa8CkAXuE0/SwdSZW+DD11Qae40nx5zqBL93vkxWW9RhHfMH/wXlG4HS7iSHC43M5kBBZ I/2//V4c1Uazm9bmIm2WDcKklBhqcDED07hCOf22833rzlEjacIer+HhkeKUY1MOFXHUe6LcpnZ kocq3+r8Ln3PH3+MyDLgtbR4nCNs/PA6N5V8xwSrrnT4NKg3/yrjlMOuhmPEQmu9LqURr0r+04P Pkf/BHnV3eBXWsObafFnUKuevfzT3LKkimrfnvrqqpQ3JaHo1bVut0iyd/ye0pMxva/rUrDZR+A hc5r//zpHFjwqm2A0XmwPvDxcmMOisapoYZumPy+W6KTzb8jiNrM8Hut5V4gf9rWbBWkeBUWKlY 6ff4SAzMeSSnRI6hQW7qrFQ+7jAk+dHPn05gDOj7wnmtYmEezFFjnhGxd2Twmzad49xIKROXEYl eU3sibRBA1WmB2k8cCg== X-Proofpoint-GUID: qHb4vcB2bfdmTTQjx5QKVEmqlX_bMzjI X-Proofpoint-Spam-Info: AW1haW4tMjYxMDI4MDA0MiBTYWx0ZWRfX6fSzC89in7I5 /l9YdahMcNaZe/FJ8OCXcGZYUcU6zwJJvHe8t3W20Ul1UVWhTT1BQsNk0UCdUMl0i+URlfCyRRF xkT+HPSvrFxL7kDXpcyUDGxox6BLkDA= 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 suspectscore=0 bulkscore=0 malwarescore=0 clxscore=1015 spamscore=0 phishscore=0 adultscore=0 impostorscore=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-2610280042 On Wed, Oct 28, 2026 at 11:58:27AM +0100, Ilya Leoshkevich wrote: > > @@ -88,6 +89,7 @@ static inline void __runtime_fixup_mask(void *where, unsigned long val) > > static inline void runtime_const_fixup(void (*fn)(void *, unsigned long), > > unsigned long val, s32 *start, s32 *end) > > { > > + guard(mutex)(&text_mutex); > > while (start < end) { > > fn(*start + (void *)start, val); > > start++; > > Interesting, so clang is able to propagate context even through indirect > calls without explicit annotations? There is no clang context analysis involved here - this is purely lockdep based (with the last patch of this series, which adds lockdep_assert_held() to s390_kernel_write()).