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From: Richard Henderson <rth-hL46jP5Bxq7R7s880joybQ@public.gmane.org>
To: Arnd Bergmann <arnd-r2nGTMty4D4@public.gmane.org>,
	Michael Cree <mcree-q3Ck4f9/EBK9koe0gwxAeg@public.gmane.org>
Cc: Russell King - ARM Linux
	<linux-I+IVW8TIWO2tmTQ+vhA3Yw@public.gmane.org>,
	linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org,
	linux-arch <linux-arch-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
	linux-api <linux-api-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
	linux-alpha-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Re: [PATCH 2/3] ARM: convert to generated system call tables
Date: Tue, 25 Oct 2016 10:03:43 -0700	[thread overview]
Message-ID: <d113bb21-cf52-6531-10b4-f73fc0b9e809@twiddle.net> (raw)
In-Reply-To: <4146248.jXuviLlvH5@wuerfel>

On 10/25/2016 03:28 AM, Arnd Bergmann wrote:
> On Tuesday, October 25, 2016 10:12:10 PM CEST Michael Cree wrote:
>> On Fri, Oct 21, 2016 at 03:06:45PM +0200, Arnd Bergmann wrote:
>>> I see your point, but I think there are serious issues with the current
>>> approach as well:
>>>
>>> - a lot of the less common architectures just don't get updated
>>>   in time, out of 22 architectures that don't use asm-generic/unistd.h,
>>>   only 12 have pwritev2 in linux-next, and only three have pkey_mprotect
>>>
>>> - some architectures that add all syscalls sometimes make a mistake
>>>   and forget one, e.g. alpha apparently never added __NR_bpf, but it
>>>   did add the later __NR_execveat.
>>
>> __NR_bpf was not forgotten on Alpha.  It was not wired up because
>> extra architecture support is needed which has not been implemented.
>>
>> But maybe we should just wire it up to sys_ni_syscall in the meantime
>> so a syscall number is reserved for it, and user space can call it to
>> get -ENOSYS returned.
> 
> Ah, I must have misinterpreted the code then. I assumed that the
> bpf syscall always works on all architectures, but that only the
> jit compiler for it required architecture specific code to make it
> more efficient.

That was my interpretation as well.  What's the problem, Michael?


r~

  reply	other threads:[~2016-10-25 17:03 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <E1bwa6s-0004ZY-4k@rmk-PC.armlinux.org.uk>
     [not found] ` <13702107.LdHY4HTXyY@wuerfel>
     [not found]   ` <20161019155325.GR1041@n2100.armlinux.org.uk>
2016-10-21 13:06     ` [PATCH 2/3] ARM: convert to generated system call tables Arnd Bergmann
2016-10-21 13:37       ` Russell King - ARM Linux
     [not found]         ` <20161021133708.GA1041-l+eeeJia6m9URfEZ8mYm6t73F7V6hmMc@public.gmane.org>
2016-10-21 15:18           ` Arnd Bergmann
2016-10-21 15:48             ` Russell King - ARM Linux
     [not found]               ` <20161021154856.GC1041-l+eeeJia6m9URfEZ8mYm6t73F7V6hmMc@public.gmane.org>
2016-10-21 16:48                 ` Joseph Myers
     [not found]                   ` <alpine.DEB.2.20.1610211641430.27636-9YEB1lltEqivcGRMvF24k2I39yigxGEX@public.gmane.org>
2016-10-21 16:57                     ` Russell King - ARM Linux
2016-10-21 20:35               ` Arnd Bergmann
2016-10-22 20:23                 ` Robert Jarzmik
2016-10-24  9:25                   ` Geert Uytterhoeven
     [not found]                     ` <CAMuHMdVy_h6Uss9bwVK5hGD42bXeEBcBsBDwCpx_eYnT9r+=Lw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2016-10-26 20:14                       ` Robert Jarzmik
2016-10-24  9:29       ` Geert Uytterhoeven
2016-10-25  9:12       ` Michael Cree
2016-10-25 10:28         ` Arnd Bergmann
2016-10-25 17:03           ` Richard Henderson [this message]
2016-10-25 17:09           ` Geert Uytterhoeven
2016-10-26  7:04           ` Michael Cree
2016-10-26  9:12             ` bpf on Alpha [was Re: [PATCH 2/3] ARM: convert to generated system call tables] Michael Cree

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