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Thu, 20 Jun 2024 12:31:06 -0400 (EDT) X-Mailer: MessagingEngine.com Webmail Interface User-Agent: Cyrus-JMAP/3.11.0-alpha0-522-ga39cca1d5-fm-20240610.002-ga39cca1d Precedence: bulk X-Mailing-List: linux-mips@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <743a2297-ff4a-4cb3-ae61-8cd4956aa565@app.fastmail.com> In-Reply-To: References: <20240612-mips-llsc-v2-0-a42bd5562bdb@flygoat.com> <20240612-mips-llsc-v2-2-a42bd5562bdb@flygoat.com> Date: Thu, 20 Jun 2024 17:30:48 +0100 From: "Jiaxun Yang" To: "Thomas Bogendoerfer" Cc: "Jonas Gorski" , "Maciej W. Rozycki" , "linux-mips@vger.kernel.org" , linux-kernel@vger.kernel.org Subject: Re: [PATCH v2 2/4] MIPS: Introduce config options for LLSC availability Content-Type: text/plain;charset=utf-8 Content-Transfer-Encoding: quoted-printable =E5=9C=A82024=E5=B9=B46=E6=9C=8820=E6=97=A5=E5=85=AD=E6=9C=88 =E4=B8=8B=E5= =8D=885:06=EF=BC=8CThomas Bogendoerfer=E5=86=99=E9=81=93=EF=BC=9A [...] > do you have an user manual stating that the R5k bug is fixed on this C= PUs ? I actually investigated R5500 a little bit. There is no explicit document mentioned this bug is fixed on R5500, but = it's not mentioned on "VR Series 64-/32-Bit Microprocessor Programming Guide" [1]= either, while some other hardware limitations are mentioned in that guide. Plus EMMA platform, which was removed form the kernel, doesn't have cpu-feature-overrides.h. This means that the platform was running with L= LSC enabled. So I think this CPU is not affected. [1]: https://repo.oss.cipunited.com/archives/docs/NEC/U10710EJ5V0AN00.pdf > > 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