linux-kernel - Re: Help with atomic fallback

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Message-ID: <20241203144955.GL1253388@nvidia.com>
Date: Tue, 3 Dec 2024 10:49:55 -0400
From: Jason Gunthorpe <jgg@...dia.com>
To: Mark Rutland <mark.rutland@....com>
Cc: Uros Bizjak <ubizjak@...il.com>,
	Alejandro Jimenez <alejandro.j.jimenez@...cle.com>,
	linux-kernel@...r.kernel.org
Subject: Re: Help with atomic fallback

On Tue, Dec 03, 2024 at 02:40:15PM +0000, Mark Rutland wrote:
> > Which expands to:
> > 
> >  old = ({ typeof(ptep) __ai_ptr = (ptep); instrument_atomic_read_write(__ai_ptr, sizeof(*__ai_ptr)); raw_cmpxchg64_relaxed_not_implemented(); });
> > 
> > And no compiler error. Presumably it doesn't link, but my compiler
> > ICE's before it gets that far.
> 
> I don't think that "my compiler ICE's" implies "compiles OK".

Well, it ICE's later. I'm using the 0-day instructions with
make.cross

during RTL pass: mach
../drivers/iommu/of_iommu.c: In function 'of_iommu_configure':
../drivers/iommu/of_iommu.c:163:1: internal compiler error: in arc_ifcvt, at config/arc/arc.cc:9703
  163 | }
      | ^

> When building io-pgtable-arm.c for ARC (with your tree!) I see the same error:

Okay, I think I see it too, it got lost in all the other noise :\

Jason