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Tue, 30 Jun 2026 09:17:26 -0400 (EDT) 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: Precedence: list MIME-Version: 1.0 X-ThreadId: ALm-NtMBapr3 Date: Tue, 30 Jun 2026 15:16:45 +0200 From: "Arnd Bergmann" To: =?UTF-8?Q?Thomas_Wei=C3=9Fschuh?= , "Andy Lutomirski" , "Thomas Gleixner" , "Ingo Molnar" , "Borislav Petkov" , "Dave Hansen" , x86@kernel.org, "H. Peter Anvin" , "Russell King" , "Catalin Marinas" , "Will Deacon" , "Madhavan Srinivasan" , "Michael Ellerman" , "Nicholas Piggin" , "Christophe Leroy" , "Thomas Bogendoerfer" , "Vincenzo Frascino" , "John Stultz" , "Stephen Boyd" , "David S . Miller" , "Andreas Larsson" Cc: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, linux-mips@vger.kernel.org, linux-api@vger.kernel.org, sparclinux@vger.kernel.org Message-Id: <965a922e-e7f2-4399-8c63-a5f4bbd6b338@app.fastmail.com> In-Reply-To: <20260630-vdso-compat_32bit_time-v2-0-520d194640dd@linutronix.de> References: <20260630-vdso-compat_32bit_time-v2-0-520d194640dd@linutronix.de> Subject: Re: [PATCH v2 0/9] vDSO: Respect COMPAT_32BIT_TIME Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable On Tue, Jun 30, 2026, at 09:38, Thomas Wei=C3=9Fschuh wrote: > If CONFIG_COMPAT_32BIT_TIME is disabled then the vDSO should not > provide any 32-bit time related functionality. This is the intended > effect of the kconfig option and also the fallback system calls would > also not be implemented. > > Currently the kconfig option does not affect the gettimeofday() syscal= l, > so also keep that in the vDSO. > > I also tried to introduce some helpers to avoid much of the ifdeffery, > but due to the high variance in the architecture-specific glue code > these would need to handle they ended up being worse than the current > proposal. > > As a side-effect this will make the self-tests more reliable, > as there is now always a matching syscall available for each vDSO func= tion. > > clock_gettime_time64() was only introduced in v6.19, so libc implement= ations ^ clock_getres_time64() > Signed-off-by: Thomas Wei=C3=9Fschuh > --- Reviewed-by: Arnd Bergmann once we have consensus on my patch 1/9 comment. Thanks for continuing this work! Arnd