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Thu, 19 Dec 2024 02:03:45 -0500 (EST) X-Mailer: MessagingEngine.com Webmail Interface Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Date: Thu, 19 Dec 2024 08:03:24 +0100 From: "Arnd Bergmann" To: =?UTF-8?Q?Thomas_Wei=C3=9Fschuh?= Cc: "Conor Dooley" , "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: <0bdeda72-73e6-4749-8d54-66c7614a6f83@app.fastmail.com> In-Reply-To: <20241219072552-7cd4512c-4f61-408a-9422-167a6f2810db@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> <137c0594-e178-4c91-bc8b-5f99b3ddb2f0@app.fastmail.com> <20241219072552-7cd4512c-4f61-408a-9422-167a6f2810db@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 Thu, Dec 19, 2024, at 07:30, Thomas Wei=C3=9Fschuh wrote: > On Wed, Dec 18, 2024 at 05:35:31PM +0100, Arnd Bergmann wrote: >> >> > There is precedence in providing 64bit only vDSO functions, for exa= mple >> > __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? >>=20 >> 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. > > Should it use the specific _vdso_clock_gettime64() naming or leave out > the 64 suffix? The VDSO function name should match the syscall name, with the '64' suffix. Any syscall ending in _time64 uses the __kernel_time64_t derived types, while the corresponding syscall names that don't end in _time64 take a __kernel_old_time_t, which is defined as __kernel_long_t and only 32 bits wide. Arnd