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[188.141.5.72]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-47f63eddd27sm41048235f8f.28.2026.07.21.11.17.46 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 21 Jul 2026 11:17:47 -0700 (PDT) From: David Carlier To: baohua@kernel.org Cc: jiangwenxiaomi@gmail.com, dev.jain@arm.com, david@kernel.org, urezki@gmail.com, linux-mm@kvack.org, linux-arm-kernel@lists.infradead.org, David Carlier Subject: Re: [PATCH v7 2/7] arm64/vmalloc: Allow arch_vmap_pte_range_map_size to batch multiple CONT_PTE Date: Tue, 21 Jul 2026 19:17:29 +0100 Message-ID: <20260721181729.305137-1-devnexen@gmail.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260715120813.3609949-3-jiangwen6@xiaomi.com> References: <20260715120813.3609949-3-jiangwen6@xiaomi.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260721_111750_562168_08E51C0E X-CRM114-Status: UNSURE ( 7.68 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Barry, Wen - the returned span is capped at PMD_SIZE >> 1 but only checked for CONT_PTE_SIZE alignment. In the batched vmap() path pages are only contiguous within a naturally aligned block, so when a PMD boundary splits a batch the next region starts mid block and the span runs past the contiguous run - set_huge_pte_at() maps the wrong pages, tail of the array left unmapped, no warning. What do you think of clamping the span to the pfn physical alignment, like 8xx does: while (!IS_ALIGNED(PFN_PHYS(pfn), size)) size >>= 1; Cheers.