Michael Ellerman [off-list ref] writes:

"Linux regression tracking (Thorsten Leemhuis)" [off-list ref] writes:

quoted

[CCing the regression list, as it should be in the loop for regressions:
https://docs.kernel.org/admin-guide/reporting-regressions.html]

On 20.05.24 17:15, Christoph Hellwig wrote:

quoted

Adding ben and the linuxppc list.

Hmm, no reply and no other progress to get this resolved afaics. So lets
bring Michael into the mix, he might be able to help out.

Sorry I didn't see the original forward for some reason.

I haven't seen this on my G5, but it's hard drive is on SATA. I think
the CDROM is pata_macio, but there isn't a disk in the drive to test
with.

quoted

BTW TWIMC: a PowerMac G5 user user reported similar symptoms here
recently: https://bugzilla.kernel.org/show_bug.cgi?id=218858

AFAICS that report is from a 4K page size kernel (Page orders: ...
virtual = 12), so there must be something else going on?

No that's wrong. The actual hardware page size is 4K, but
CONFIG_PAGE_SIZE and PAGE_SHIFT etc. is 64K.

So at least for this user the driver used to work with 64K pages, and
now doesn't.

cheers