linux-kernel - Re: [PATCH 2/2] sysctl: remove sysctl syscall

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Date:	Wed, 20 Oct 2010 13:41:05 +0800
From:	Cong Wang <amwang@...hat.com>
To:	Andi Kleen <ak@...ux.intel.com>
CC:	Andreas Schwab <schwab@...hat.com>, linux-kernel@...r.kernel.org,
	Randy Dunlap <rdunlap@...otime.net>,
	Mauro Carvalho Chehab <mchehab@...hat.com>,
	Len Brown <len.brown@...el.com>, Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Howells <dhowells@...hat.com>,
	Eric Paris <eparis@...hat.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Eric Dumazet <eric.dumazet@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	Andy Shevchenko <ext-andriy.shevchenko@...ia.com>,
	linux-doc@...r.kernel.org
Subject: Re: [PATCH 2/2] sysctl: remove sysctl syscall

On 10/19/10 23:05, Andi Kleen wrote:
> On 10/19/2010 4:10 PM, Andreas Schwab wrote:
>>> On 10/19/2010 10:22 AM, Amerigo Wang wrote:
>>>> Remove the obsolete sysctl syscall. It was scheduled
>>>> to be removed in Sept.
>>>
>>> I thought at least older glibc was still using it? Did anyone check
>>> what happens if it sees no sysctl(2)?
>> It will fall back reading from /proc/sys.
>
> First that's slow (but ok), but that will fail if there is no /proc.
>

I strongly doubt glibc will work if there is no /proc,
a quick grep shows lots of "/proc" strings in glibc code.
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