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Peter Anvin" , Andy Lutomirski , Peter Zijlstra , Steven Rostedt , Andrew Morton , Mark Rutland , Tom Lendacky , Ashish Kalra , James Gowans , Stanislav Kinsburskii , arnd@arndb.de, pbonzini@redhat.com, madvenka@linux.microsoft.com, Anthony Yznaga , Usama Arif , David Woodhouse , Benjamin Herrenschmidt Subject: Re: [PATCH v2 17/17] devicetree: Add bindings for ftrace KHO Message-ID: <20240102145317.GA2815776-robh@kernel.org> References: <20231222193607.15474-1-graf@amazon.com> <20231222195144.24532-1-graf@amazon.com> <20231222195144.24532-12-graf@amazon.com> <39a33f9b-0290-428d-ab1f-f90856cdb31d@kernel.org> <34e78a84-a29d-4b01-a860-cac3959f6cb6@amazon.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <34e78a84-a29d-4b01-a860-cac3959f6cb6@amazon.com> X-Rspamd-Queue-Id: B3E42C000A X-Rspam-User: X-Stat-Signature: z454hbyawji9cpun34xacrwrat8yw3ze X-Rspamd-Server: rspam01 X-HE-Tag: 1704207203-935389 X-HE-Meta: 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 vpgnFiD1 K10WWVSk1amHGj+Q3L21idKBmhPA8in70BPwmwFDqky+8Q2YSQ7CiNOksHoNFHo7AlY6mIS7Uecf7r3M670KMtORsgcfpfHHDfEizoRzFIESRUFNEAn5nYd54azmyD+AjnNo6rbpMp5WuqasG4dtwGrLgQ7xJiqoV8rONatGzhnGH4hCyqh+Lq6p+ymOuYMV3y8Ix 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: On Sun, Dec 24, 2023 at 12:20:17AM +0100, Alexander Graf wrote: > Hi Krzysztof! > > Thanks a lot for the fast review! > > On 23.12.23 15:30, Krzysztof Kozlowski wrote: > > On 22/12/2023 20:51, Alexander Graf wrote: > > > With ftrace in KHO, we are creating an ABI between old kernel and new > > > kernel about the state that they transfer. To ensure that we document > > > that state and catch any breaking change, let's add its schema to the > > > common devicetree bindings. This way, we can quickly reason about the > > > state that gets passed. > > Please use scripts/get_maintainers.pl to get a list of necessary people > > and lists to CC (and consider --no-git-fallback argument). It might > > happen, that command when run on an older kernel, gives you outdated > > entries. Therefore please be sure you base your patches on recent Linux > > kernel. [...] > > > > > + mem = < 0x101000000ULL 0x38ULL 0x101000100ULL 0x1000ULL 0x101000038ULL 0x38ULL 0x101002000ULL 0x1000ULL>; > > ? Do you see any of such syntax in DTS? > > > I was trying to make it easy to reason to readers about 64bit numbers - and > then potentially extend dtc to consume that new syntax. KHO DTs are > native/little endian, so dtc already has some difficulties interpreting it > which I'll need to fix up with patches to it eventually :). I'll change it > to something that looks more 32bit'y for now. "/bits/ 64 <0x0 ...>" is what you are looking for. Rob