linux-kernel - Re: [PATCH] m68k: Merge mmu and non-mmu versions of sys_call

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Date:	Fri, 6 May 2011 07:11:42 +0200
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	"Linux/m68k" <linux-m68k@...ts.linux-m68k.org>,
	Greg Ungerer <gerg@...inux.org>,
	Linux Kernel Development <linux-kernel@...r.kernel.org>,
	uClinux list <uclinux-dev@...inux.org>
Subject: Re: [PATCH] m68k: Merge mmu and non-mmu versions of sys_call_table

On Thu, May 5, 2011 at 22:37, Arnd Bergmann <arnd@...db.de> wrote:
> On Thursday 05 May 2011 20:44:20 Geert Uytterhoeven wrote:
>> recvmmsg is a false positive, as we set __ARCH_WANT_SYS_SOCKETCALL.
>
> This looks really strange. The commit that introduced recvmmsg (a2e27255)
> added it to both socketcall and as a separate syscall in a number of
> architectures, without a good reason for it. I guess it's too late
> to change that now, but we should at least fix the script so we
> don't report it missing when socketcall is set.

Some architectures don't use socketcall, so they use a separate syscall.
IIRC, powerpc is migrating away from socketcall (commit
86250b9d12caa1a3dee12a7cf638b7dd70eaadb6, "powerpc: Wire up direct
socket system calls"), hence they added a separate call for it.

> However, if your unistd.h has defined __NR_recvmmsg before, you should
> probably add it to the syscall table, just in case that someone built
> a binary with that number.

We never had it.

BTW, we have a hole at 218/219. I don't remember why, but it may have been
a placeholder for pselect6 and ppoll when that implementation was still in flux.
Couldn't find anything about it in git/cvs archives, so I'll check
have to check my
old mailing list archives...

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds
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