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Thu, 23 Nov 2023 12:33:51 -0500 (EST) X-Mailer: MessagingEngine.com Webmail Interface User-Agent: Cyrus-JMAP/3.9.0-alpha0-1234-gac66594aae-fm-20231122.001-gac66594a MIME-Version: 1.0 Message-Id: <245d3985-9085-4be0-8c74-d95d06334584@app.fastmail.com> In-Reply-To: References: <20231122182419.30633-1-fancer.lancer@gmail.com> <20231122182419.30633-2-fancer.lancer@gmail.com> <8ca730b9-fa8c-46ea-bdc5-158da0f29c3a@app.fastmail.com> Date: Thu, 23 Nov 2023 17:33:31 +0000 From: "Jiaxun Yang" To: "Thomas Bogendoerfer" Cc: "Serge Semin" , "Arnd Bergmann" , "Andrew Morton" , "Mike Rapoport" , "Matthew Wilcox" , "Tiezhu Yang" , "Huacai Chen" , "Yinglu Yang" , "Alexey Malahov" , "Aleksandar Rikalo" , "Aleksandar Rikalo" , "Dragan Mladjenovic" , "Chao-ying Fu" , "Marc Zyngier" , "linux-mips@vger.kernel.org" , linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH 1/7] mips: dmi: Fix early remap on MIPS32 Content-Type: text/plain;charset=utf-8 Content-Transfer-Encoding: quoted-printable X-Rspamd-Queue-Id: 271EA40004 X-Rspam-User: X-Stat-Signature: 55wim8w4cmxatt1ijwmozzkw9ezj393i X-Rspamd-Server: rspam03 X-HE-Tag: 1700760835-759472 X-HE-Meta: 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 PFN2YMlP jg7gAzMnaVAhSxL9IY885RRtdjMBlZWv+gliFmZ4ruErehCLXYkYIB34Wkaw5gObymk5NbU0IMWzLlfw6AtAOfeQJ+GoCDRmK1MaFzX2ZhS8kHhEmfwvxXEUP/6YiN4ne2nA7VadOFx9RZxGCi7L6dGnPa8HUeWZ2/YTBBVLEs5r0MR76adX3o9sxIbShTz27V1mf7c69UheQEC4/3QnsaIWD0I9gmEKq5Rw/6PTuRxgn6v3APiBFGnsIljFHDOy3Q60Myq6fcMemxlhGS4WSUf1WQz0hFwPMQa+F3j21rjdxulFNqCUyVU6CY6SzTcS7YDBHopdhn2UClO9ualS/T6yKVA== 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: =E5=9C=A82023=E5=B9=B411=E6=9C=8823=E6=97=A5=E5=8D=81=E4=B8=80=E6=9C=88 = =E4=B8=8B=E5=8D=884:07=EF=BC=8CThomas Bogendoerfer=E5=86=99=E9=81=93=EF=BC=9A > On Thu, Nov 23, 2023 at 03:07:09PM +0000, Jiaxun Yang wrote: >>=20 [...] > > the problem with all 32bit unmapped segments is their limitations in > size. But there is always room to try to use unmapped and fall back > to mapped, if it doesn't work. But I doubt anybody is going to > implement that. Yep, I guess fallback should be implemented for ioremap_cache as well. > >> >> AFAIK for Loongson DMI is located at cached memory so using iorema= p_uc >> >> blindly will cause inconsistency. >> > >> > why ? >>=20 >> Firmware sometimes does not flush those tables from cache back to mem= ory. >> For Loongson systems (as well as most MTI systems) cache is enabled by >> firmware. > > kernel flushes all caches on startup, so there shouldn't be a problem. Actually dmi_setup() is called before cpu_cache_init(). Thanks > > Thomas. > > --=20 > Crap can work. Given enough thrust pigs will fly, but it's not necessa= rily a > good idea. [ RFC1925, 2= .3 ] --=20 - Jiaxun