linux-kernel - Re: [PATCH 22/23] sysctl arm: Remove binary sysctl support

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Date:	Sun, 08 Nov 2009 14:45:36 -0800
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Russell King <rmk+lkml@....linux.org.uk>
Cc:	linux-kernel@...r.kernel.org, Leo Chen <leochen@...adcom.com>
Subject: Re: [PATCH 22/23] sysctl arm: Remove binary sysctl support

Russell King <rmk+lkml@....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.

Eric
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