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Thu, 16 Apr 2026 05:51:26 +0000 (GMT) Date: Thu, 16 Apr 2026 07:51:24 +0200 From: Alexander Gordeev To: Heiko Carstens Cc: Kevin Brodsky , David Hildenbrand , Andrew Morton , Gerald Schaefer , Christian Borntraeger , Vasily Gorbik , Claudio Imbrenda , linux-s390@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v2 5/6] s390/mm: Batch PTE updates in lazy MMU mode Message-ID: <140b7365-e3c9-4bbe-ae10-15332ab97b62-agordeev@linux.ibm.com> References: <924c91e711e8b16470eb2af7e31d0b6ffcf2940c.1776264097.git.agordeev@linux.ibm.com> <20260416054045.10407A20-hca@linux.ibm.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260416054045.10407A20-hca@linux.ibm.com> X-TM-AS-GCONF: 00 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNDE2MDA1MiBTYWx0ZWRfX5pIGN9vk30we dEdDpjHcN3OtZZhU9RR6MeNf2QNxxFkV0hzShlf5P32vZ/72MVdRnUOWgAxVNPplaFNcT7/QSIj SY48LJKBDrMU+HVnn0iunlzFd4dEWGN9mvCyZfloITf19pxIuel2ViUn1UuCcCuKrtdT0Ha01Vg /OuqiETY1NC9qBcwMWOAXzx2f7kI6n2ofhS825l2tlzwjHweZCOHZAcj8zNOnh3yMq3k754+rfg FflZ67AzX/ZpvN/HkPVVwt8ZvutgINT6fmLfnla0yRzg3kweZL/aDR8lAttzHHfb5XAV7DWrPnb 9CmmK+3kTHDLOIEXy2AXfgmT9z2CV1ml7G2+4rl7ojVbARA4EdhLNc0oOYLSQiRRCT3dgfIntaZ J+ZHcjZVXsUbhx9dTS3Y9MUckE/QT1hYqjEIRXjIjJFs0m3hBFva0/ZvNhwnXzDL0zVo2QTos/G 7c5UeehORU3RaYMGSgg== X-Proofpoint-ORIG-GUID: UEg3ZGRPSaxBIgycQGOzLqPcS2ClwgUn X-Proofpoint-GUID: UEg3ZGRPSaxBIgycQGOzLqPcS2ClwgUn X-Authority-Analysis: v=2.4 cv=fYidDUQF c=1 sm=1 tr=0 ts=69e078e3 cx=c_pps a=aDMHemPKRhS1OARIsFnwRA==:117 a=aDMHemPKRhS1OARIsFnwRA==:17 a=kj9zAlcOel0A:10 a=A5OVakUREuEA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=U7nrCbtTmkRpXpFmAIza:22 a=glRYRA6g95Ob0rDooU8A:9 a=CjuIK1q_8ugA:10 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-04-16_01,2026-04-13_04,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 adultscore=0 impostorscore=0 clxscore=1015 malwarescore=0 phishscore=0 bulkscore=0 priorityscore=1501 spamscore=0 suspectscore=0 lowpriorityscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2604070000 definitions=main-2604160052 On Thu, Apr 16, 2026 at 07:40:45AM +0200, Heiko Carstens wrote: > > +#if !defined(CONFIG_IPTE_BATCH) || defined(__DECOMPRESSOR) > > +static inline > > +bool ipte_batch_ptep_test_and_clear_young(struct vm_area_struct *vma, > > + unsigned long addr, pte_t *ptep, > > + int *res) > > +{ > > + return false; > > +} > > Why does this depend on __DECOMPRESSOR? Which code in the decompressor > would generate a call to the ipte_batch functions? Any call to ptep_get() or set_pte().