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Wed, 29 Oct 2025 16:41:16 GMT Received: from smtpav06.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 7782620049; Wed, 29 Oct 2025 16:41:16 +0000 (GMT) Received: from smtpav06.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 5CF4F20040; Wed, 29 Oct 2025 16:41:14 +0000 (GMT) Received: from li-008a6a4c-3549-11b2-a85c-c5cc2836eea2.ibm.com (unknown [9.111.14.225]) by smtpav06.fra02v.mail.ibm.com (Postfix) with ESMTPS; Wed, 29 Oct 2025 16:41:14 +0000 (GMT) Date: Wed, 29 Oct 2025 17:41:12 +0100 From: Alexander Gordeev To: Kevin Brodsky Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, Andreas Larsson , Andrew Morton , Boris Ostrovsky , Borislav Petkov , Catalin Marinas , Christophe Leroy , Dave Hansen , David Hildenbrand , "David S. Miller" , David Woodhouse , "H. Peter Anvin" , Ingo Molnar , Jann Horn , Juergen Gross , "Liam R. Howlett" , Lorenzo Stoakes , Madhavan Srinivasan , Michael Ellerman , Michal Hocko , Mike Rapoport , Nicholas Piggin , Peter Zijlstra , Ryan Roberts , Suren Baghdasaryan , Thomas Gleixner , Vlastimil Babka , Will Deacon , Yeoreum Yun , linux-arm-kernel@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, sparclinux@vger.kernel.org, xen-devel@lists.xenproject.org, x86@kernel.org Subject: Re: [PATCH v4 07/12] mm: enable lazy_mmu sections to nest Message-ID: References: <20251029100909.3381140-1-kevin.brodsky@arm.com> <20251029100909.3381140-8-kevin.brodsky@arm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20251029100909.3381140-8-kevin.brodsky@arm.com> X-TM-AS-GCONF: 00 X-Authority-Analysis: v=2.4 cv=K+gv3iWI c=1 sm=1 tr=0 ts=690243b0 cx=c_pps a=AfN7/Ok6k8XGzOShvHwTGQ==:117 a=AfN7/Ok6k8XGzOShvHwTGQ==:17 a=kj9zAlcOel0A:10 a=x6icFKpwvdMA:10 a=VkNPw1HP01LnGYTKEx00:22 a=A7EgIBmc_bNo8zDYgroA:9 a=CjuIK1q_8ugA:10 a=zZCYzV9kfG8A:10 a=DXsff8QfwkrTrK3sU8N1:22 a=Z5ABNNGmrOfJ6cZ5bIyy:22 a=bWyr8ysk75zN3GCy5bjg:22 X-Proofpoint-ORIG-GUID: 4s5OgOW5GqS8eVWCgDfypaa1QGghCrCr X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUxMDI4MDE2NiBTYWx0ZWRfXxhPJM2SCp9M3 JIxHzUs/CGPXr2j/HKIQSyzP/NPWYyBAsUaz21z4d+ni6Yh52/bKe6ciGNuCC/yvPIu873sf8eD gUHIw+TkZjXiw5u5gLht6WE4fmO7hFP9NwF2MCouQJJ1JbmQRPIZ83a9wuBP/AITVNjmJ0xGGmG qezpKkQxzyKV9sl1nHhwJfM6t+wdGPLGm2dgusnKzSs3rGhIdUuwvWs6rihxfKcmPaUdbPSNC2O eRn1rutFYoUesHzwc84/+sqyzl9CY76RRz3bxV43lF1ZZZBVTvKGz/ggCG3uOGlSWeIVhUkfR5+ V0NM8GYqpxuXlg/ptkK3CqTUml5yz9fsasWNSY3QfT7gjFUhGJ7eXLt9sN5PD8nzr1T3dYuMu78 3y4Xh9Rxn4COiXYCY3Cfr/IFgKK3Dg== X-Proofpoint-GUID: mFGA4Vr_KjknbicSy-pCCIOL2RNOgklo X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.9,FMLib:17.12.100.49 definitions=2025-10-29_06,2025-10-29_03,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 priorityscore=1501 impostorscore=0 suspectscore=0 adultscore=0 clxscore=1011 malwarescore=0 phishscore=0 spamscore=0 bulkscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2510240000 definitions=main-2510280166 X-Rspamd-Server: rspam12 X-Rspamd-Queue-Id: 8EA141A0018 X-Stat-Signature: cyu1fqkeyoze9xatkdghifgsgs1oiioe X-Rspam-User: X-HE-Tag: 1761756109-25808 X-HE-Meta: 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 7HUDX2CZ BcaO2Hxv53lP7HynZtkCQ5Dxa6XlRq6OCFSM3gg6ps30A6dQricOkVh7TJqBo8k+mrz7g3e8y00+zMi70Mz7bwnz8ig+s33X0DxXTtHEVB3c0BktaNyj3q+76kfroNBsASryxJf3Iaxkn3I1OUSq2/3hs5+fvQasK4CdCZ47sBVrcLmyrFZyemeM5W80l8LzfMo1Hk9e5fCLTlYyITmNAiXTuR4YmWt6UYJKWBw+TwpBVyOHDjeBzyZ1spT/JEs9SYsJLkINTnJW3N1EtG40BfdXRjMZmtEgqabq8kMA7z94qinpFs+TDJ6Cu4DYLKyCy5IoKA7E0QJnhT9VTfwzUPvesuHAbqa+gouL6S05yYhiP0KBkSY3RY0LHAW2YcCJE4KGqjnxR7cadyhWhfFMuu2iyaaDOP5n6T7lqgJQjLSzsBEE= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Wed, Oct 29, 2025 at 10:09:04AM +0000, Kevin Brodsky wrote: Hi Kevin, > +#ifdef CONFIG_ARCH_HAS_LAZY_MMU_MODE > +static inline bool in_lazy_mmu_mode(void) > +{ > + return current->lazy_mmu_state.active; Whether (nesting_level > 0) is more correct check? Otherwise, it returns false while in paused mode. May be check both nesting_level and active and also introduce in_lazy_mmu_paused_mode() right away to avoid any confusion? > +} > +#else > +static inline bool in_lazy_mmu_mode(void) > +{ > + return false; > +} > +#endif > + > extern struct pid *cad_pid; > > /* Thanks!