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Message-ID: <ecedb0f1-9543-35c6-18bd-723e6bf21173@csgroup.eu>
Date: Wed, 8 Nov 2023 18:31:17 +0000
From: Christophe Leroy <christophe.leroy@...roup.eu>
To: Arnd Bergmann <arnd@...nel.org>,
Andrew Morton <akpm@...ux-foundation.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
Masahiro Yamada <masahiroy@...nel.org>,
"linux-kbuild@...r.kernel.org" <linux-kbuild@...r.kernel.org>
CC: Arnd Bergmann <arnd@...db.de>, Matt Turner <mattst88@...il.com>,
Vineet Gupta <vgupta@...nel.org>,
Russell King <linux@...linux.org.uk>,
Catalin Marinas <catalin.marinas@....com>,
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Subject: Re: [PATCH 15/22] arch: vdso: consolidate gettime prototypes
Hi Arnd,
Le 08/11/2023 à 13:58, Arnd Bergmann a écrit :
> From: Arnd Bergmann <arnd@...db.de>
>
> The VDSO functions are defined as globals in the kernel sources but intended
> to be called from userspace, so there is no need to declare them in a kernel
> side header.
>
> Without a prototype, this now causes warnings such as
>
> arch/mips/vdso/vgettimeofday.c:14:5: error: no previous prototype for '__vdso_clock_gettime' [-Werror=missing-prototypes]
> arch/mips/vdso/vgettimeofday.c:28:5: error: no previous prototype for '__vdso_gettimeofday' [-Werror=missing-prototypes]
> arch/mips/vdso/vgettimeofday.c:36:5: error: no previous prototype for '__vdso_clock_getres' [-Werror=missing-prototypes]
> arch/mips/vdso/vgettimeofday.c:42:5: error: no previous prototype for '__vdso_clock_gettime64' [-Werror=missing-prototypes]
> arch/sparc/vdso/vclock_gettime.c:254:1: error: no previous prototype for '__vdso_clock_gettime' [-Werror=missing-prototypes]
> arch/sparc/vdso/vclock_gettime.c:282:1: error: no previous prototype for '__vdso_clock_gettime_stick' [-Werror=missing-prototypes]
> arch/sparc/vdso/vclock_gettime.c:307:1: error: no previous prototype for '__vdso_gettimeofday' [-Werror=missing-prototypes]
> arch/sparc/vdso/vclock_gettime.c:343:1: error: no previous prototype for '__vdso_gettimeofday_stick' [-Werror=missing-prototypes]
>
> Most architectures have already added workarounds for these by adding
> declarations somewhere, but since these are all compatible, we should
> really just have one copy, with an #ifdef check for the 32-bit vs
> 64-bit variant and use that everywhere.
>
> Unfortunately, the sparc version is currently incompatible since
> that never added support for __vdso_clock_gettime64() in 32-bit
> userland. For the moment, I'm leaving this one out, as I can't
> easily test it and it requires a larger rework.
>
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
> arch/arm/include/asm/vdso.h | 5 -----
> arch/arm/vdso/vgettimeofday.c | 1 +
> arch/arm64/kernel/vdso32/vgettimeofday.c | 1 +
> arch/csky/kernel/vdso/vgettimeofday.c | 11 +----------
> arch/loongarch/vdso/vgettimeofday.c | 7 +------
> arch/mips/vdso/vgettimeofday.c | 1 +
> arch/riscv/kernel/vdso/vgettimeofday.c | 7 +------
> arch/x86/entry/vdso/vclock_gettime.c | 10 +---------
> arch/x86/include/asm/vdso/gettimeofday.h | 2 --
> arch/x86/um/vdso/um_vdso.c | 1 +
> include/vdso/gettime.h | 23 +++++++++++++++++++++++
> 11 files changed, 31 insertions(+), 38 deletions(-)
> create mode 100644 include/vdso/gettime.h
powerpc has functions doing more or less the same, they are called
__c_kernel_clock_gettime() and alike with their prototypes siting in
arch/powerpc/include/asm/vdso/gettimeofday.h
Should those prototypes be moved to include/vdso/gettime.h too and
eventually renamed, or are they considered too powerpc specific ?
Christophe
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