linux-kernel - Re: [Uclinux-dist-devel] Re: [PATCH] Blackfin arch: add some missing syscall

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Date:	Fri, 14 Sep 2007 02:44:37 -0400
From:	"Mike Frysinger" <vapier.adi@...il.com>
To:	bryan.wu@...log.com
Cc:	"Bernd Schmidt" <bernds_cb1@...nline.de>, bernd.schmidt@...log.com,
	linux-arch@...r.kernel.org, "Matthew Wilcox" <matthew@....cx>,
	"Linux Kernel" <linux-kernel@...r.kernel.org>,
	"Paul Mundt" <lethal@...ux-sh.org>,
	uclinux-dist-devel@...ckfin.uclinux.org,
	"Andrew Morton" <akpm@...ux-foundation.org>
Subject: Re: [Uclinux-dist-devel] Re: [PATCH] Blackfin arch: add some missing syscall

On 9/14/07, Bryan Wu <bryan.wu@...log.com> wrote:
> On Thu, 2007-09-13 at 13:03 +0200, Bernd Schmidt wrote:
> > Bryan Wu wrote:
> > >>> but mremap doesn't -- there's even an implementation in mm/nommu.c.
> > >>> Could you check the rest of these over to see if they truly don't need
> > >>> to be implemented for no-mmu?
> > >> you're right we want mremap, my fault
> > >>
> > >
> > > Yes, I do think so, both sys_mremap and sys_munmap are implemented in
> > > mm/nommu.c. How do think of this, Bernd?
> >
> > There's a mremap in nommu.c, but it doesn't do a lot that is useful.
> > With some further mm changes in our tree, it's little more than a fancy
> > way of saying munmap, and uClibc does not use it, so there's no
> > compelling need to have it in userspace.
>
> Make sense. So currently Blackfin uClinux use the mremap/munmap in
> uClibc?

most functions like this dont have any real libc component ... uClibc
will define userspace symbols that merely make a syscall iff the __NR_
exists in the headers

if we have __NR_mremap in our unistd.h, we'll automagically get the
mremap() symbol in uClibc which simply passes along the args to the
kernel
-mike
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