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h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=Rw7b4Ah+uga3FnevhlB/g0Y+OhmjMpx14GqulYuXCa//NJplqDatQszbIzym3ESTS sW9yHfsriNZHqLPswLscBCKXftbr0qmWcmhocrkKU1NYPwT6nfnJwbTcrPXFtiUE7A rtngZO/Fhzaxh7c0pZgrcQhTQJrcs+OabQ3b3I0E= Message-ID: <929dedc2-eea3-4153-be6d-d2dd727fed89@arm.com> Date: Tue, 14 Jul 2026 14:06:19 +0530 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v6 0/6] mm/vmalloc: Speed up ioremap, vmalloc and vmap with contiguous memory To: Wen Jiang , Andrew Morton Cc: catalin.marinas@arm.com, linux-mm@kvack.org, urezki@gmail.com, will@kernel.org, Xueyuan.chen21@gmail.com, ajd@linux.ibm.com, david@kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, rppt@kernel.org, ryan.roberts@arm.com, dev.jain@arm.com, Wen Jiang References: <20260709073823.6643-1-jiangwen6@xiaomi.com> <20260709160805.26e63bae89dd03cf2951104e@linux-foundation.org> Content-Language: en-US From: Anshuman Khandual In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspam-User: X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 4043280007 X-Stat-Signature: 6grmjxs8tros8tubf4dd6jt7m687kmd5 X-HE-Tag: 1784018188-35036 X-HE-Meta: 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 X/qSjPzT Pd2yuwkvZQFg3gHAcX+CJr3r/NQKW2uYU+RYklXx93Q542y4Sz44vWrxTzc3TwRsnu3xqRDxfuNnDiawmnw37jkfNtP6j+6pp81e2s+u5rRiD4HyDGMCRHp7mpj2ZDD0Sc+ymHwlMe9RK11C07XUZ/HNr3Vi6A1cTWGvuro4uYenuThS4MMT/hUCWL6l6F5QOluFDT25Jdun/jErF753lOUVxyuMPn5iFOpU8NhRTO6guPkGpdtDQ/cBu8ifVStW4c7mAYr0U1DiPnhr0fqHXMfoFKhWBHcisFX8GOMuboJf/KrzS95K7QxhE7F/Ybh3OdvE+94K3/LTjCKcn1FEc/oWRAvDr+AUrZLufISBbOoSo6GWYlCa49LvIlODSKo+lr1ib2EXN8iq6e8ntGu29sJ6pjb3GOId3ubz6DsAV0U4izZz2ceTyXSLUvbCI+cHofiN60GzjvLCTSE/4M6vpfLCnx7oxevSz7lcL Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 10/07/26 2:24 PM, Wen Jiang wrote: > On Fri, 10 Jul 2026 at 07:08, Andrew Morton wrote: >> >> On Thu, 9 Jul 2026 15:38:17 +0800 Wen Jiang wrote: >> >>> This patchset accelerates ioremap, vmalloc, and vmap when the memory >>> is physically fully or partially contiguous. >> >> Thanks, I added this to mm.git's mm-new branch for wider testing. >> >> AI review asked some questions, and some of them are new since the v5 >> series: >> https://sashiko.dev/#/patchset/20260709073823.6643-1-jiangwen6@xiaomi.com > > Hi Andrew, > > I've gone through the Sashiko findings: > > - Patch 1 (find_num_contig): Over-interpretation. No new hugetlbfs hstate > is added. The extra sizes are only used by init_mm kernel mappings via. But not sure if that is a right approach. If these multi CONT_PTE sized mappings need to be supported in vmalloc() but without adding corresponding HugeTLB sizes, probably these required helpers could just be factored outside HugeTLB. > > - Patch 5/6 (NULL page): Invalid input. vmap() expects a fully populated > array of valid struct page pointers. > > - Patch 6 (32-bit count << PAGE_SHIFT overflow): Pre-existing. This was > already discussed in the V3 thread, and a separate fix was proposed > there. > > Thanks, > Wen