Re: [PATCH] wait_on_bit: add an acquire memory barrier

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On Fri, 26 Aug 2022, Mikulas Patocka wrote:

> 
> 
> On Fri, 26 Aug 2022, Will Deacon wrote:
> 
> > On Thu, Aug 25, 2022 at 05:03:40PM -0400, Mikulas Patocka wrote:
> > > 
> > > For me, the kernel 6.0-rc2 doesn't boot in an arm64 virtual machine at all 
> > > (with or without this patch), so I only compile-tested it on arm64. I have 
> > > to bisect it.
> > 
> > It's working fine for me and I haven't had any other reports that it's not
> > booting. Please could you share some more details about your setup so we
> > can try to reproduce the problem?
> 
> I'm bisecting it now. I'll post the offending commit when I'm done.

So, the bad commit is aacd149b62382c63911060b8f64c1e3d89bd405a ("arm64: 
head: avoid relocating the kernel twice for KASLR").

> It gets stuck without printing anything at this point:
> Loading Linux 6.0.0-rc2 ...
> Loading initial ramdisk ...
> EFI stub: Booting Linux Kernel...
> EFI stub: Using DTB from configuration table
> EFI stub: Exiting boot services...
> 
> I uploaded my .config here: 
> https://people.redhat.com/~mpatocka/testcases/arm64-config/config-6.0.0-rc2 
> so you can try it on your own.
> 
> The host system is MacchiatoBIN board with Debian 10.12.

Mikulas




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