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Re: Regression in 028abd92 for Sun UltraSPARC T1



Hello!

On 3/22/21 10:30 PM, Frank Scheiner wrote:
> Riccardo Mottola first recognized a problem with 5.10.x kernels on his
> Sun T2000 with UltraSPARC T1 (details in [this thread]). I could verify
> the problem also on my Sun T1000 and it looks like this specific issue
> breaks the mounting of the root FS or maybe mounting file systems at
> all. This affects both booting from disk and from network.
> (...)
> ...as first bad commit.
> 
> ```
> commit 028abd9222df0cf5855dab5014a5ebaf06f90565
> Author: Christoph Hellwig <hch@lst.de>
> Date:   Thu Sep 17 10:22:34 2020 +0200
> 
>     fs: remove compat_sys_mount
> 
>     compat_sys_mount is identical to the regular sys_mount now, so
> remove it
>     and use the native version everywhere.
> ```
> 
> [1]:
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=028abd9222df0cf5855dab5014a5ebaf06f90565

Looking at this change, I think it's rather unexpected that this particular
change would break the kernel on a specific CPU target. Are you sure that
this is the right bad commit?

If you found the right commit, then I assume there is something wrong with
the syscall handling on UltraSPARC T1.

Adrian

-- 
 .''`.  John Paul Adrian Glaubitz
: :' :  Debian Developer - glaubitz@debian.org
`. `'   Freie Universitaet Berlin - glaubitz@physik.fu-berlin.de
  `-    GPG: 62FF 8A75 84E0 2956 9546  0006 7426 3B37 F5B5 F913


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