linux-kernel - Re: [PATCH] arch/tile: new multi-core architecture for Linux

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Message-ID: <4BFBE8FF.6080208@tilera.com>
Date:	Tue, 25 May 2010 11:13:03 -0400
From:	Chris Metcalf <cmetcalf@...era.com>
To:	Arnd Bergmann <arnd@...db.de>
CC:	Ulrich Drepper <drepper@...il.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-arch@...r.kernel.org, Chen Liqin <liqin.chen@...plusct.com>
Subject: Re: [PATCH] arch/tile: new multi-core architecture for Linux

On 5/25/2010 11:03 AM, Arnd Bergmann wrote:
> I would keep allocating from the bottom. For now, maybe we should just
> reserve 16 arch specific syscall numbers starting at 244, and add
>
> #define __NR_tile_cmpxchg_baddr (__NR_arch_specific_syscall + 0)
> #define __NR_tile_raise_fpe	(__NR_arch_specific_syscall + 1)
> #define __NR_tile_flush_cache	(__NR_arch_specific_syscall + 2)
>
> to your own unistd.h.
>   

OK.

>  The idea was to only have them around as a transitional helper for
> new architectures while getting merged, but nothing should ever
> use these in production.
>   

Perhaps the best strategy for Tile for now is to enable the transitional
helpers, and then when glibc no longer requires any of those syscalls,
we can remove them from the kernel.  If this happens in the relatively
short term (e.g. before our 3.0 release later this year) all the better,
but for now we can separate this into a first change that preserves most
of the compatibility syscalls, and work towards remove them in a later
release.

-- 
Chris Metcalf, Tilera Corp.
http://www.tilera.com


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