Re: [PATCH] Revert "iommu/arm-smmu: Convert to domain_alloc_paging()"

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On Tue, Feb 13, 2024 at 02:09:00PM +0000, Will Deacon wrote:
> Hey Jason,
> 
> On Tue, Feb 13, 2024 at 09:47:26AM -0400, Jason Gunthorpe wrote:
> > On Tue, Feb 13, 2024 at 12:59:52PM +0000, Will Deacon wrote:
> > > > The typical kernel standard is to fix bugs in patches and only reach
> > > > for a wholesale revert if the community is struggling with bug
> > > > fixing. Dmitry already tested removing that hunk, Robin explained the
> > > > issue, we understand the bug fix is to remove the
> > > > arm_smmu_init_domain_context() call. Nothing justifies a full scale
> > > > revert.
> > > 
> > > I can't say I'm aware of any consensus for how to handle this, to be
> > > completely honest with you. 
> > 
> > Well, I work in a lot of subsystems and this is a surprise to me and
> > not something I've seen before. Fix the bug, move forward. Reverts are
> > a cultural admission of failure. I use threats of a revert as a hammer
> > to encourage people to pay attention to the bugs. I hardly ever
> > actually revert things. What does reverting their code say to my
> > submitters???
> 
> Huh. I guess I'm lucky never to have worked in a environment where that
> is the case. In fact, my experience is quite the opposite: revert first
> so that things get back to a working state and the developer/submitter
> has some breathing room to rework the broken code. It's actually fairly
> blameless if you get it right and when you have a half-functional CI it's
> pretty much a necessity. Anyway, I digress...

Fascinating, I am glad we had this discussion because I was pretty put
off by this talk of revert in this and the other thread. Cultural
differences!

Thanks,
Jason




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