linux-kernel - Re: What's in asm-generic.git

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Date:	Thu, 10 Dec 2009 22:25:05 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Mike Frysinger <vapier.adi@...il.com>
Cc:	liqin.chen@...plusct.com, linux-arch@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: What's in asm-generic.git

On Thursday 10 December 2009, Mike Frysinger wrote:
> > I have found now that sys_accept4 was missing. sys_set_thread_area however
> > is only defined on x86 and mips. Since you don't currently implement this
> > on score, maybe it would be more appropriate to handle it like the other
> > architectures do, rather than adding it to asm-generic/unistd.h?
> 
> isnt the point of asm-generic/unistd.h to collect all common syscalls
> ?  if there's syscalls that ideally should be handled by everyone but
> currently doesnt, then it's easy to define it in the header but have
> the actual entry.S leave it as a hole ...

Well, sys_thread_area is not a common syscall but rather an exception.
I haven't looked at how glibc does implents TLS on different architectures,
but I think this is commonly done purely in user space without the
need for a syscall.

	Arnd
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