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

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Date:	Sat, 7 May 2011 15:16:40 +0200
From:	Mikael Pettersson <mikpe@...uu.se>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:	Mikael Pettersson <mikpe@...uu.se>, Arnd Bergmann <arnd@...db.de>,
	"Linux/m68k" <linux-m68k@...r.kernel.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 Sat, 7 May 2011 10:34:25 +0200, Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
> On Thu, May 5, 2011 at 22:39, Mikael Pettersson <mikpe@...uu.se> wrote:
> > Geert Uytterhoeven writes:
> > =C2=A0> On Thu, 5 May 2011, Arnd Bergmann wrote:
> > =C2=A0> > Did you check the macros in unistd to see if they match the
> > =C2=A0> > actual table? I guess it would be a good time to comment out
> > =C2=A0> > the ones that are not implemented in either of the two ABIs.
> > =C2=A0>
> > =C2=A0> Like this?
> > =C2=A0>
> > =C2=A0> warning: #warning syscall pselect6 not implemented
> > =C2=A0> warning: #warning syscall ppoll not implemented
> > =C2=A0> warning: #warning syscall recvmmsg not implemented
> > =C2=A0>
> > =C2=A0> Do we need pselect6 and ppoll? I have vague memories not requirin=
> g it.
> >
> > They close user-space race conditions, so you want them.
> 
> So do you recommend to backport the wiring up of pselect6/ppoll to -stable?
> We always had their _NR_* defines, so I guess glibc was always compiled
> with pselect6/ppoll support, and will use it if it's present.

Any kernel with working TIF_RESTORE_SIGMASK should ideally also
wire up pselect6/ppoll.  But their omission is not a regression
so backporting to 2.6.38 is probably sufficient.

/Mikael
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