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To: Russell King <rmk+lkml@arm.linux.org.uk>
Cc: linux-kernel@vger.kernel.org, Leo Chen <leochen@broadcom.com>
Subject: Re: [PATCH 22/23] sysctl arm: Remove binary sysctl support
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From: ebiederm@xmission.com (Eric W. Biederman)
Date: Sun, 08 Nov 2009 15:05:05 -0800
In-Reply-To: <m1pr7siqjz.fsf@fess.ebiederm.org> (Eric W. Biederman's message of "Sun\, 08 Nov 2009 14\:45\:36 -0800")
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ebiederm@xmission.com (Eric W. Biederman) writes:

> Russell King <rmk+lkml@arm.linux.org.uk> writes:
>
>>
>> NAK.  Glibc uses these numeric sysctls to support ioperm emulation on ARM.
>> Therefore, removal of these numeric sysctls breaks that user interface:
>>
>>   static int iobase_name[] = { CTL_BUS, BUS_ISA, BUS_ISA_PORT_BASE };
>>   static int ioshift_name[] = { CTL_BUS, BUS_ISA, BUS_ISA_PORT_SHIFT };
>>   if (! sysctl (iobase_name, 3, &io.io_base, &len, NULL, 0)
>>       && ! sysctl (ioshift_name, 3, &io.shift, &len, NULL, 0))
>>     {
>>       io.initdone = 1;
>>       return 0;
>>     }
>
> Those still exist in sysctl_binary.c are provided by reading
> /proc/sys/bus/isa/membase, /proc/sys/bus/isa/portbase, and
> /proc/sys/bus/isa/portshift.
>
> The practical difference is that /proc support now must be compiled
> in to support sys_sysctl.

But thanks for the reminder that I need to go into glibc and fix this before
we disable the sys_sysctl emulation by default.

Eric