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

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Message-Id: <1189755148.8165.15.camel@roc-desktop>
Date:	Fri, 14 Sep 2007 15:32:28 +0800
From:	Bryan Wu <bryan.wu@...log.com>
To:	Mike Frysinger <vapier.adi@...il.com>
Cc:	bryan.wu@...log.com, 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 Fri, 2007-09-14 at 02:44 -0400, Mike Frysinger wrote:
> 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

Yes, I know this. But currently, __NR_mremap does not exit in Blackfin
unistd.h:
/* 163 __NR_mremap */.

So the implementation of this kind syscalls should be in uClibc, right?

And Bernd said that the kernel version mremap/munmap is not very useful
for Blackfin arch. I think mremap/munmap can be ignored in Blackfin.

Thanks
-Bryan
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