From: Christophe Leroy <christophe.leroy@csgroup.eu>
To: Michael Ellerman <mpe@ellerman.id.au>,
Arnd Bergmann <arnd@arndb.de>, Arnd Bergmann <arnd@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
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Subject: Re: [PATCH 15/22] arch: vdso: consolidate gettime prototypes
Date: Thu, 9 Nov 2023 10:49:05 +0000 [thread overview]
Message-ID: <886df4e4-9fc2-ca52-e7e9-53688e6e821a@csgroup.eu> (raw)
In-Reply-To: <87o7g3qlf5.fsf@mail.lhotse>
Le 09/11/2023 à 11:18, Michael Ellerman a écrit :
> "Arnd Bergmann" <arnd@arndb.de> writes:
>> On Wed, Nov 8, 2023, at 19:31, Christophe Leroy wrote:
>>> Le 08/11/2023 à 13:58, Arnd Bergmann a écrit :
>>
>>> 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 ?
>>
>> I don't actually know, my initial interpretation was that
>> these function names are part of the user ABI for the vdso,
>> but I never looked closely enough at how vdso works to
>> be sure what the actual ABI is.
>
> AFAIK the ABI is just the symbols we export, as defined in the linker
> script:
>
> /*
> * This controls what symbols we export from the DSO.
> */
> VERSION
> {
> VDSO_VERSION_STRING {
> global:
> __kernel_get_syscall_map;
> __kernel_gettimeofday;
> __kernel_clock_gettime;
> __kernel_clock_getres;
> __kernel_get_tbfreq;
> __kernel_sync_dicache;
> __kernel_sigtramp_rt64;
> __kernel_getcpu;
> __kernel_time;
>
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/powerpc/kernel/vdso/vdso64.lds.S?h=v6.6&#n117
>
>> If __c_kernel_clock_gettime() etc are not part of the user-facing
>> ABI, I think renaming them for consistency with the other
>> architectures would be best.
>
> The __c symbols are not part of the ABI, so we could rename them.
>
> At the moment though they don't have the same prototype as the generic
> versions, because we find the VDSO data in asm and pass it to the C
> functions, eg:
>
> int __c_kernel_gettimeofday(struct __kernel_old_timeval *tv, struct timezone *tz,
> const struct vdso_data *vd);
>
> I think we can rework that though, by implementing
> __arch_get_vdso_data() and getting the vdso_data in C. Then we'd be able
> to share the prototypes.
I think it would not a been good idea, it would be less performant, for
explanation see commit
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=e876f0b69dc993e86ca7795e63e98385aa9a7ef3
Christophe
next prev parent reply other threads:[~2023-11-09 10:49 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-11-08 12:58 [PATCH 00/22] -Wmissing-prototype warning fixes Arnd Bergmann
2023-11-08 12:58 ` [PATCH 01/22] [RESEND^2] ida: make 'ida_dump' static Arnd Bergmann
2023-11-08 12:58 ` [PATCH 02/22] [RESEND^2] jffs2: mark __jffs2_dbg_superblock_counts() static Arnd Bergmann
2023-11-09 1:07 ` Zhihao Cheng
2023-11-08 12:58 ` [PATCH 03/22] [RESEND] kprobes: unify kprobes_exceptions_nofify() prototypes Arnd Bergmann
2023-11-08 23:20 ` Masami Hiramatsu
2023-11-08 12:58 ` [PATCH 04/22] [RESEND] time: make sysfs_get_uname() function visible in header Arnd Bergmann
2023-11-10 12:41 ` Uwe Kleine-König
2023-11-08 12:58 ` [PATCH 05/22] [RESEND] parport: gsc: mark init function static Arnd Bergmann
2023-11-08 12:58 ` [PATCH 06/22] [RESEND] stackleak: add declarations for global functions Arnd Bergmann
2023-11-08 12:58 ` [PATCH 07/22] [RESEND] sched: fair: move unused stub functions to header Arnd Bergmann
2023-11-08 12:58 ` [PATCH 08/22] [v2] arch: consolidate arch_irq_work_raise prototypes Arnd Bergmann
2024-01-10 9:03 ` Geert Uytterhoeven
2024-01-10 10:20 ` Arnd Bergmann
2023-11-08 12:58 ` [PATCH 09/22] [v2] arch: fix asm-offsets.c building with -Wmissing-prototypes Arnd Bergmann
2023-11-08 19:10 ` Sam Ravnborg
2023-11-08 12:58 ` [PATCH 10/22] microblaze: include linux/cpu.h for trap_init() prototype Arnd Bergmann
2023-11-08 20:42 ` Geert Uytterhoeven
2023-11-08 21:07 ` Arnd Bergmann
2023-11-08 21:10 ` Geert Uytterhoeven
2023-11-08 12:58 ` [PATCH 11/22] x86: sta2x11: include header for sta2x11_get_instance() prototype Arnd Bergmann
2023-11-08 12:58 ` [PATCH 12/22] csky: fix arch_jump_label_transform_static override Arnd Bergmann
2023-11-12 4:21 ` Guo Ren
2023-11-08 12:58 ` [PATCH 13/22] arch: add do_page_fault prototypes Arnd Bergmann
2023-11-08 12:58 ` [PATCH 14/22] arch: add missing prepare_ftrace_return() prototypes Arnd Bergmann
2023-11-08 12:58 ` [PATCH 15/22] arch: vdso: consolidate gettime prototypes Arnd Bergmann
2023-11-08 18:31 ` Christophe Leroy
2023-11-08 19:37 ` Arnd Bergmann
2023-11-09 7:50 ` Christophe Leroy
2023-11-09 10:18 ` Michael Ellerman
2023-11-09 10:49 ` Christophe Leroy [this message]
2023-11-09 12:23 ` Michael Ellerman
2023-11-10 10:16 ` Vincenzo Frascino
2023-11-24 12:04 ` Mark Brown
2023-11-08 12:58 ` [PATCH 16/22] bcachefs: mark bch2_target_to_text_sb() static Arnd Bergmann
2023-11-08 20:19 ` Kent Overstreet
2023-11-08 12:58 ` [PATCH 17/22] powerpc: ps3: move udbg_shutdown_ps3gelic prototype Arnd Bergmann
2023-11-08 14:18 ` Geoff Levand
2023-11-08 15:10 ` Jakub Kicinski
2023-11-08 12:58 ` [PATCH 18/22] powerpc: pasemi: mark pas_shutdown() static Arnd Bergmann
2023-11-08 12:58 ` [PATCH 19/22] powerpc: powermac: mark smp_psurge_{give,take}_timebase static Arnd Bergmann
2023-11-08 12:58 ` [PATCH 20/22] usb: fsl-mph-dr-of: mark fsl_usb2_mpc5121_init() static Arnd Bergmann
2023-11-21 14:12 ` Greg Kroah-Hartman
2023-11-08 12:58 ` [PATCH 21/22] fbdev/fsl-diu-fb: mark wr_reg_wa() static Arnd Bergmann
2023-11-08 12:58 ` [PATCH 22/22] Makefile.extrawarn: turn on missing-prototypes globally Arnd Bergmann
2023-12-07 12:38 ` (subset) [PATCH 00/22] -Wmissing-prototype warning fixes Michael Ellerman
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