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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> 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: <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 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!