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Wed, 18 Dec 2024 11:36:32 -0500 (EST) X-Mailer: MessagingEngine.com Webmail Interface X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: MIME-Version: 1.0 Date: Wed, 18 Dec 2024 17:35:31 +0100 From: "Arnd Bergmann" To: =?UTF-8?Q?Thomas_Wei=C3=9Fschuh?= , "Conor Dooley" Cc: "James E . J . Bottomley" , "Helge Deller" , "Andy Lutomirski" , "Thomas Gleixner" , "Vincenzo Frascino" , "Anna-Maria Gleixner" , "Frederic Weisbecker" , "Andrew Morton" , "Catalin Marinas" , "Will Deacon" , "Theodore Ts'o" , "Jason A . Donenfeld" , "Paul Walmsley" , "Palmer Dabbelt" , "Albert Ou" , "Huacai Chen" , "WANG Xuerui" , "Russell King" , "Heiko Carstens" , "Vasily Gorbik" , "Alexander Gordeev" , "Christian Borntraeger" , "Sven Schnelle" , "Thomas Bogendoerfer" , "Michael Ellerman" , "Nicholas Piggin" , "Christophe Leroy" , "Naveen N Rao" , "Madhavan Srinivasan" , "Ingo Molnar" , "Borislav Petkov" , "Dave Hansen" , x86@kernel.org, "H. Peter Anvin" , linux-parisc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-riscv@lists.infradead.org, loongarch@lists.linux.dev, linux-s390@vger.kernel.org, linux-mips@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, Linux-Arch , "Nam Cao" Message-Id: <137c0594-e178-4c91-bc8b-5f99b3ddb2f0@app.fastmail.com> In-Reply-To: <20241218162031-ee920684-db10-4f17-b1cb-50373d7ea954@linutronix.de> References: <20241216-vdso-store-rng-v1-0-f7aed1bdb3b2@linutronix.de> <20241216-vdso-store-rng-v1-7-f7aed1bdb3b2@linutronix.de> <20241218-action-matchbook-571b597b7f55@spud> <20241218162031-ee920684-db10-4f17-b1cb-50373d7ea954@linutronix.de> Subject: Re: [PATCH 07/17] riscv: vdso: Switch to generic storage implementation Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable On Wed, Dec 18, 2024, at 16:46, Thomas Wei=C3=9Fschuh wrote: > On Wed, Dec 18, 2024 at 03:08:28PM +0000, Conor Dooley wrote: >> On Mon, Dec 16, 2024 at 03:10:03PM +0100, Thomas Wei=C3=9Fschuh wrote: >> Might be a clang thing, allmodconfig with clang doesn't build either. > > The proposed generic storage infrastructure currently expects that all > its users also use HAVE_GENERIC_VDSO. > I missed rv32 when checking this assumption. > > I can add a bunch of ifdefs into the storage code to handle this. > > Or we re-add the time vDSO functions which were removed in commit > d4c08b9776b3 ("riscv: Use latest system call ABI"). > Today there are upstream ports of musl and glibc which can use them. > (currently musl even tries to use __vdso_clock_gettime() as 64-bit only > on rv32 due to a copy-and-paste error from its rv64 code) Adding back __vdso_clock_gettime() wouldn't work on rv32 because there is no fallback syscall for it, and it wouldn't really help since there is no existing userspace that uses time32 structures. > There is precedence in providing 64bit only vDSO functions, for example > __vdso_clock_gettime64() in arm. > I do have a small, so far untested, proof-of-concept patch for it. > This would even be less code than the ifdefs. > > What do you think about it? Yes, simply exposing the normal time64 syscalls through vdso should be fine. I think this currently works on everything except rv32 and sparc32, probably because neither of them have actual users that are able to test. Arnd