linux-kernel - Re: [BUG] 2.6.23-rc3 can't see sd partitions on Alpha

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Date:	Sat, 08 Dec 2007 09:43:27 +1300
From:	Michael Cree <mcree@...on.net.nz>
To:	Bob Tracy <rct@...s.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>, mingo@...e.hu,
	linux-kernel@...r.kernel.org, rjw@...k.pl, rth@...ddle.net,
	ink@...assic.park.msu.ru, linux-scsi@...r.kernel.org,
	kay.sievers@...y.org, greg@...ah.com
Subject: Re: [BUG] 2.6.23-rc3 can't see sd partitions on Alpha

Bob Tracy wrote:
> That was quick :-).  Backing out the sysctl_check.c diff gives me a
> working kernel.  Beats the #$%@! out of me how/why, though.
> 
> Michael Cree: could you try backing out the diff below from your
> 2.6.24-rc3 tree and see if things are now working for you?

Yes (conference is now over).  I backed out the sysctl_check patch from 
2.6.24-rc3 and, indeed, got a working kernel.

The working kernel (was probably 2.6.24-rc3 less sysctl_check patch, but 
might have been a 2.6.23 variant) has the following in /sys/block

alpha:~# ls -l /sys/block/
total 0
drwxr-xr-x  5 root root 0 2007-12-08 08:55 fd0
drwxr-xr-x  6 root root 0 2007-12-08 08:55 hde
drwxr-xr-x  5 root root 0 2007-12-08 08:55 hdf
drwxr-xr-x 10 root root 0 2007-12-08 08:55 sda
drwxr-xr-x  9 root root 0 2007-12-08 08:55 sdb
alpha:~# ls -l /sys/block/sda
total 0
-r--r--r-- 1 root root 8192 2007-12-08 08:55 capability
-r--r--r-- 1 root root 8192 2007-12-08 08:55 dev
lrwxrwxrwx 1 root root    0 2007-12-08 08:55 device -> 
../../devices/pci0001:01/0001:01:06.0/host0/target0:0:1/0:0:1:0
drwxr-xr-x 2 root root    0 2007-12-08 08:55 holders
drwxr-xr-x 3 root root    0 2007-12-08 08:55 queue
-r--r--r-- 1 root root 8192 2007-12-08 08:55 range
-r--r--r-- 1 root root 8192 2007-12-08 08:55 removable
drwxr-xr-x 3 root root    0 2007-12-08 08:55 sda1
drwxr-xr-x 3 root root    0 2007-12-08 08:55 sda2
drwxr-xr-x 3 root root    0 2007-12-08 08:55 sda3
drwxr-xr-x 3 root root    0 2007-12-08 08:55 sda4
drwxr-xr-x 3 root root    0 2007-12-08 08:55 sda5
-r--r--r-- 1 root root 8192 2007-12-08 08:55 size
drwxr-xr-x 2 root root    0 2007-12-08 08:55 slaves
-r--r--r-- 1 root root 8192 2007-12-08 08:55 stat
lrwxrwxrwx 1 root root    0 2007-12-08 08:55 subsystem -> ../../block
--w------- 1 root root 8192 2007-12-08 08:55 uevent
alpha:~# grep . /sys/block/sda/*/dev
/sys/block/sda/sda1/dev:8:1
/sys/block/sda/sda2/dev:8:2
/sys/block/sda/sda3/dev:8:3
/sys/block/sda/sda4/dev:8:4
/sys/block/sda/sda5/dev:8:5



The broken kernel (2.6.24-rc3) has the following in /sys/block

alpha:~# ls -l /sys/block/
total 0
drwxr-xr-x  5 root root 0 Dec  8 09:22 fd0
drwxr-xr-x  6 root root 0 Dec  8 09:22 hde
drwxr-xr-x  5 root root 0 Dec  8 09:23 hdf
drwxr-xr-x 10 root root 0 Dec  8 09:22 sda
drwxr-xr-x  9 root root 0 Dec  8 09:23 sdb
alpha:~# ls -l /sys/block/sda
total 0
-r--r--r-- 1 root root 8192 Dec  8 09:22 capability
-r--r--r-- 1 root root 8192 Dec  8 09:22 dev
lrwxrwxrwx 1 root root    0 Dec  8 09:23 device -> 
../../devices/pci0001:01/0001:01:06.0/host0/target0:0:1/0:0:1:0
drwxr-xr-x 2 root root    0 Dec  8 09:22 holders
drwxr-xr-x 3 root root    0 Dec  8 09:22 queue
-r--r--r-- 1 root root 8192 Dec  8 09:22 range
-r--r--r-- 1 root root 8192 Dec  8 09:22 removable
drwxr-xr-x 3 root root    0 Dec  8 09:22 sda1
drwxr-xr-x 3 root root    0 Dec  8 09:22 sda2
drwxr-xr-x 3 root root    0 Dec  8 09:22 sda3
drwxr-xr-x 3 root root    0 Dec  8 09:22 sda4
drwxr-xr-x 3 root root    0 Dec  8 09:22 sda5
-r--r--r-- 1 root root 8192 Dec  8 09:22 size
drwxr-xr-x 2 root root    0 Dec  8 09:22 slaves
-r--r--r-- 1 root root 8192 Dec  8 09:22 stat
lrwxrwxrwx 1 root root    0 Dec  8 09:22 subsystem -> ../../block
--w------- 1 root root 8192 Dec  8 09:22 uevent
alpha:~# grep . /sys/block/sda/*/dev
/sys/block/sda/sda1/dev:8:1
/sys/block/sda/sda2/dev:8:2
/sys/block/sda/sda3/dev:8:3
/sys/block/sda/sda4/dev:8:4
/sys/block/sda/sda5/dev:8:5

I failed to spot any difference (other than the formatting of the dates) 
between the two!

Cheers
Michael.

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