From: "H. Peter Anvin" <hpa@zytor.com>
To: "Thomas Weißschuh" <thomas.weissschuh@linutronix.de>,
"Arnd Bergmann" <arnd@arndb.de>
Cc: Andy Lutomirski <luto@kernel.org>,
Thomas Gleixner <tglx@kernel.org>, Ingo Molnar <mingo@redhat.com>,
Borislav Petkov <bp@alien8.de>,
Dave Hansen <dave.hansen@linux.intel.com>,
x86@kernel.org, Russell King <linux@armlinux.org.uk>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>,
Madhavan Srinivasan <maddy@linux.ibm.com>,
Michael Ellerman <mpe@ellerman.id.au>,
Nicholas Piggin <npiggin@gmail.com>,
Christophe Leroy <chleroy@kernel.org>,
Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
Vincenzo Frascino <vincenzo.frascino@arm.com>,
linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
linuxppc-dev@lists.ozlabs.org, linux-mips@vger.kernel.org
Subject: Re: [PATCH 1/7] x86/vdso: Respect COMPAT_32BIT_TIME
Date: Tue, 3 Mar 2026 10:11:52 -0800 [thread overview]
Message-ID: <49b7c9f9-198a-49f7-880b-6ae74d7bd985@zytor.com> (raw)
In-Reply-To: <20260227103226-cc3bb32c-0107-4c09-b81a-ca33ea03ad5c@linutronix.de>
On 2026-02-27 01:34, Thomas Weißschuh wrote:
>>>
>> The thing about gettimeofday() and time() is that they don't have
>> a 64-bit version and libc implementations are expected to call
>> clock_gettime() instead. The result was that there was never a
>> patch to turn the off either.
>
> gettimeofday() is currently the only way to get the timezone of the kernel.
> But I guess this is a legacy thing anyways. If you say we should drop it,
> let's drop it.
>
The time zone in the kernel has never worked anyway, as it would require the
kernel to contain at least the forward portion of the zoneinfo/tzdata table in
order to actually work correctly. The only plausible use of it would be for
local time-based filesystems like FAT, but I don't think we bother.
A bigger question is whether or not we should omit these from the vDSO
completely (potentially causing link failures) or replace them with stubs
returning -ENOSYS.
-hpa
next prev parent reply other threads:[~2026-03-03 18:47 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-02-27 6:57 [PATCH 0/7] vDSO: Respect COMPAT_32BIT_TIME Thomas Weißschuh
2026-02-27 6:57 ` [PATCH 1/7] x86/vdso: " Thomas Weißschuh
2026-02-27 8:51 ` Arnd Bergmann
2026-02-27 8:58 ` Arnd Bergmann
2026-02-27 9:34 ` Thomas Weißschuh
2026-03-03 18:11 ` H. Peter Anvin [this message]
2026-03-03 20:50 ` Arnd Bergmann
2026-03-03 21:00 ` H. Peter Anvin
2026-03-03 21:27 ` Arnd Bergmann
2026-03-03 21:36 ` H. Peter Anvin
2026-04-10 7:24 ` Thomas Weißschuh
2026-04-13 15:59 ` Arnd Bergmann
2026-04-13 16:13 ` Thomas Weißschuh
2026-04-13 16:57 ` Arnd Bergmann
2026-04-14 10:16 ` Thomas Weißschuh
2026-03-04 7:35 ` Thomas Weißschuh
2026-03-04 18:30 ` H. Peter Anvin
2026-03-05 9:24 ` Thomas Weißschuh
2026-03-05 23:57 ` H. Peter Anvin
2026-03-06 9:42 ` Thomas Weißschuh
2026-03-06 20:52 ` H. Peter Anvin
2026-02-27 6:57 ` [PATCH 2/7] ARM: VDSO: " Thomas Weißschuh
2026-02-27 6:57 ` [PATCH 3/7] arm64: vdso32: " Thomas Weißschuh
2026-02-27 6:57 ` [PATCH 4/7] powerpc/vdso: " Thomas Weißschuh
2026-02-27 6:57 ` [PATCH 5/7] MIPS: VDSO: Drop kconfig MIPS_CLOCK_VSYSCALL Thomas Weißschuh
2026-02-27 8:46 ` Arnd Bergmann
2026-02-27 9:31 ` Thomas Weißschuh
2026-02-27 10:03 ` Arnd Bergmann
2026-02-27 10:17 ` Thomas Weißschuh
2026-02-27 6:57 ` [PATCH 6/7] MIPS: VDSO: Respect COMPAT_32BIT_TIME Thomas Weißschuh
2026-02-27 6:57 ` [PATCH 7/7] vdso/gettimeofday: Verify COMPAT_32BIT_TIME interactions Thomas Weißschuh
2026-02-27 8:49 ` Arnd Bergmann
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