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[209.85.218.45]) by smtp.gmail.com with ESMTPSA id 4fb4d7f45d1cf-5bbb2c41916sm861092a12.41.2024.08.08.11.20.12 for (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 08 Aug 2024 11:20:12 -0700 (PDT) Received: by mail-ej1-f45.google.com with SMTP id a640c23a62f3a-a7a8a4f21aeso156005766b.2 for ; Thu, 08 Aug 2024 11:20:12 -0700 (PDT) X-Forwarded-Encrypted: i=1; AJvYcCVw4m3p/VtscOVo4PxglmIz61MPsZoN84BrX1aecrhNa2IB1WK25hrXhPIPa3IwYq18YoV3TDg6krt5Br/Te0gLT3A= X-Received: by 2002:a17:907:969e:b0:a7d:2c91:fb1b with SMTP id a640c23a62f3a-a8090f1a339mr207711166b.68.1723141212363; Thu, 08 Aug 2024 11:20:12 -0700 (PDT) MIME-Version: 1.0 References: <20240731095022.970699670@linuxfoundation.org> <718b8afe-222f-4b3a-96d3-93af0e4ceff1@roeck-us.net> <53b2e1f2-4291-48e5-a668-7cf57d900ecd@suse.cz> <87le194kuq.ffs@tglx> <90e02d99-37a2-437e-ad42-44b80c4e94f6@suse.cz> <87frrh44mf.ffs@tglx> <76c643ee-17d6-463b-8ee1-4e30b0133671@roeck-us.net> <87plqjz6aa.ffs@tglx> <87a5hnyox6.ffs@tglx> <8734nezz0g.ffs@tglx> In-Reply-To: <8734nezz0g.ffs@tglx> From: Linus Torvalds Date: Thu, 8 Aug 2024 11:19:51 -0700 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [PATCH 6.10 000/809] 6.10.3-rc3 review To: Thomas Gleixner Cc: Guenter Roeck , Vlastimil Babka , linux-kernel@vger.kernel.org, Linux-MM , Helge Deller , linux-parisc@vger.kernel.org Content-Type: text/plain; charset="UTF-8" X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: EC49E100032 X-Stat-Signature: o465p4xw4zwqzty1ixgyj5i7xn3sekmo X-Rspam-User: X-HE-Tag: 1723141215-514394 X-HE-Meta: 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 ANFO4oqj 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000081, 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 Thu, 8 Aug 2024 at 10:48, Thomas Gleixner wrote: > > Here is the disassembly from my latest crashing debug kernel which > shifts it up a couple of pages. Add 0x10 or sub 0x20 to make it work. Looks like I was off by an instruction, it's the 28th divide-step (not 29) that does the page crosser: > 4121dffc: 0b 21 04 41 ds r1,r25,r1 > 4121e000: 0b bd 07 1d add,c ret1,ret1,ret1 but my parisc knowledge is not good enough to even guess at what could go wrong. And I have no actual reason to believe this has *anything* to do with an itlb miss, except for that whole "exact placement seems to matter, and it crosses a page boundary" detail. None of this makes sense. I think we'll have to wait for Helge. It's not like parisc is a huge concern, and for all we know this is all a qemu bug to begin with. Linus