Linux kernel 3.x problems on PowerMac G5
benh at kernel.crashing.org
Sun Mar 10 11:45:08 EST 2013
On Sun, 2013-03-10 at 01:26 +0100, Phileas Fogg wrote:
> i managed to find the bad commit after a couple of days bisecting.
> 44ae3ab3358e962039c36ad4ae461ae9fb29596c is the first bad commit
> commit 44ae3ab3358e962039c36ad4ae461ae9fb29596c
> Author: Matt Evans <matt at ozlabs.org>
> Date: Wed Apr 6 19:48:50 2011 +0000
> powerpc: Free up some CPU feature bits by moving out MMU-related
> Some of the 64bit PPC CPU features are MMU-related, so this patch moves
> them to MMU_FTR_ bits. All cpu_has_feature()-style tests are moved to
> mmu_has_feature(), and seven feature bits are freed as a result.
> Signed-off-by: Matt Evans <matt at ozlabs.org>
> Signed-off-by: Benjamin Herrenschmidt <benh at kernel.crashing.org>
Have you verified that if you checkout git at the above commit point, it
fails and if you then just revert that commit on top, it works again ?
The above should have been mostly a NOP change but I'll have a closer
look in case a typo of some kind actually broke something.
> Actually, there are 2 problems i found.
> The first problem occurs when i enable IDE CDROM driver on my machine.
> The following commit causes hangs on my machine at boot:
Ok. You may want to switch to the new libata instead of the old IDE
(CONFIG_IDE off, CONFIG_ATA on, CONFIG_PATA_MACIO on and from there it
will use the SCSI CDROM driver).
> commit 5b03a1b140e13a28ff6be1526892a9dc538ddef6
> Author: Tejun Heo <tj at kernel.org>
> Date: Wed Mar 9 19:54:27 2011 +0100
> ide: Convert to bdops->check_events()
> Convert ->media_changed() to the new ->check_events() method. The
> conversion is mostly mechanical. The only notable change is that
> cdrom now doesn't generate any event if @slot_nr isn't CDSL_CURRENT.
> It used to return -EINVAL which would be treated as media changed. As
> media changer isn't supported anyway, this doesn't make any
> This makes ide emit the standard disk events and allows kernel event
> polling. Currently, only MEDIA_CHANGE event is implemented. Adding
> support for EJECT_REQUEST shouldn't be difficult; however, given that
> ide driver is already deprecated, it probably is best to leave it
> Signed-off-by: Tejun Heo <tj at kernel.org>
> If i disable IDE CDROM driver then the Linux kernel boots again
> and then it hits the commit 44ae3ab3358e962039c36ad4ae461ae9fb29596c
> and hangs again :)
> The commit eca590f402332ab873d13f2d8d00fa0b91cfff36 which is before
> the commit 44ae3ab3358e962039c36ad4ae461ae9fb29596c works fine,
> i tested it myself to be on the safe side.
Ok thanks. I'll dig a bit if I get a chance next week.
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