linux-kernel - Re: [GIT PULL] Please pull rdma.git

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Message-ID: <acf2b9a82e0c28a9c63d04a8153e1ff4fc814327.camel@redhat.com>
Date:   Mon, 29 Apr 2019 14:17:35 -0400
From:   Doug Ledford <dledford@...hat.com>
To:     Leon Romanovsky <leon@...nel.org>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        linux-rdma <linux-rdma@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        "Gunthorpe, Jason" <jgg@...pe.ca>
Subject: Re: [GIT PULL] Please pull rdma.git

On Mon, 2019-04-29 at 21:00 +0300, Leon Romanovsky wrote:
> On Mon, Apr 29, 2019 at 01:13:01PM -0400, Doug Ledford wrote:
> > On Mon, 2019-04-29 at 09:48 -0700, Linus Torvalds wrote:
> > > On Mon, Apr 29, 2019 at 9:29 AM Doug Ledford <dledford@...hat.com> wrote:
> > > >  drivers/infiniband/core/uverbs_main.c | 2 +-
> > > >  1 file changed, 1 insertion(+), 1 deletion(-)
> > > 
> > > This trivial one-liner is actually incorrect.
> > > 
> > > It should use 'vmf->address', because the point of the ZERO_PAGE
> > > argument is to pick the page with the right virtual address alias for
> > > broken architectures that need those kinds.
> > > 
> > > I'm actually surprised s390 wants it, usually it's just MIPS that has
> > > the horribly broken virtual address translation stuff. But it looks
> > > like for s390 it's at least only a performance issue (ie it causes
> > > some aliases in L1 that cause cacheline ping-pong rather than anything
> > > else).
> > 
> > That's what I get for listening to Jason ;-)
> > 
> > Well, since you have just essentially re-written the patch to be
> > correct, you are now the developer of origin.  Do you want to commit the
> > fix directly or shall I respin it for you to pull?
> 
> Linus already committed it.
> 
> The whole breakage is mystery for me, the patch which introduced
> breakage, got successful build report from 0-build.

Yeah, successful 0-day build is a good indicator, but not a guarantee. 
You just can't test all possible permutations and sometimes things slip
by.  But it's still way better than 20 years ago when half the patches
weren't even compile tested before coming to Linus ;-)


-- 
Doug Ledford <dledford@...hat.com>
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