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Thu, 06 Nov 2025 09:09:02 -0800 (PST) Received: from dw-tp ([171.76.85.117]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-7b0c9c0874bsm68007b3a.16.2025.11.06.09.08.52 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 06 Nov 2025 09:09:02 -0800 (PST) From: Ritesh Harjani (IBM) To: Alexander Gordeev Cc: Kevin Brodsky , 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 In-Reply-To: <87ikfn3yvs.ritesh.list@gmail.com> Date: Thu, 06 Nov 2025 22:31:27 +0530 Message-ID: <87h5v73xjs.ritesh.list@gmail.com> References: <20251029100909.3381140-1-kevin.brodsky@arm.com> <20251029100909.3381140-8-kevin.brodsky@arm.com> <87ms5050g0.ritesh.list@gmail.com> <50d1b63a-88d7-4484-82c0-3bde96e3207d-agordeev@linux.ibm.com> <87ikfn3yvs.ritesh.list@gmail.com> MIME-Version: 1.0 Content-Type: text/plain X-Stat-Signature: 6tn7f1cweje8j3t14wry171zfdaqtac3 X-Rspam-User: X-Rspamd-Queue-Id: 141BA40005 X-Rspamd-Server: rspam01 X-HE-Tag: 1762448943-602313 X-HE-Meta: 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 XT6x1stX aJR5frHVuJfOuIRGJLhWIM7kvX1XoMLwB7nHGdRQ3VnRBYyFBTeew+AMy75YUDSvHX1nUXSyC+ESKXwOoxPHN08XU4hfxaziRXuyLYKLRdTXT6P8iOjLxaE29kPo/lsMizBH7cf9PSupvKu8kEhdwW6D0JQ2EOH/apuemLmURTrju6C/y0/Hk3mfpcBVhBKR7inPGn164TidTYOMHMYQpARLi8xv8+P8PaVhRByhtxhTbk6zU8/M3dQkN4OKOaQzkj12jumPGeuy3nTUp8xmmmIkpRWprfh5/44hvvz0uwKIFShFiLxhSoFrPTxlwS0WpzYpgry790jiaKsb7t1MDCV04736MfWejEtXze25WFZzMfOqCQYWP6aj5DSgS5lf+NS3BjzV8LHuIwMiFEpn0berD/5t4XNe6Oa8P6NrqYUTcgvkyJldrcb85fUhJganBC4/MC+gNvXQ5/9cY6eEHP8/GOREJP1bemxcJyrqpAJVA5mI= 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: Ritesh Harjani (IBM) writes: > For e.g... > > arch_enter_lazy_mmu_mode() > hpte_need_flush() > get_cpu_var() // this takes care of preempt_disable() > adds vpns to per-cpu batch[i] > put_cpu_var() // > arch_leave_lazy_mmu_mode() > Sorry, here is the more accurate call sequence for previous email. caller()... arch_enter_lazy_mmu_mode() ptep_xxx_() pte_update() hpte_need_flush() get_cpu_var() // this takes care of preempt_disable() adds vpns to per-cpu batch[i] put_cpu_var() // arch_leave_lazy_mmu_mode() -ritesh