linux-kernel - Re: linux-next: build failure after merge of the vfs tree

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Date:   Wed, 7 Oct 2020 10:46:33 -0500
From:   Josh Poimboeuf <jpoimboe@...hat.com>
To:     Stephen Rothwell <sfr@...b.auug.org.au>
Cc:     Al Viro <viro@...iv.linux.org.uk>,
        Linux Next Mailing List <linux-next@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Borislav Petkov <bp@...e.de>
Subject: Re: linux-next: build failure after merge of the vfs tree

On Wed, Oct 07, 2020 at 08:04:05AM +1100, Stephen Rothwell wrote:
> Hi Josh,
> 
> On Tue, 6 Oct 2020 09:30:12 -0500 Josh Poimboeuf <jpoimboe@...hat.com> wrote:
> >
> > On Mon, Sep 28, 2020 at 11:10:56PM -0500, Josh Poimboeuf wrote:
> > > > Josh, any ideas?  We could, of course, make it "r"(size), but that would
> > > > be unpleasant in all existing callers...  
> > > 
> > > Sorry, I've been traveling.  I'd just vote for making it "r".
> > > 
> > > array_index_nospec() is always called after a usercopy.  I don't think
> > > anyone will notice the extra mov, for the cases where it would be
> > > propagated as an immediate.  And the argument *is* an unsigned long
> > > after all.
> > > 
> > > Stephen, can you confirm this fixes it?  
> > 
> > Still traveling, I didn't see an update on this.  Any objections to the
> > below?  I assume it fixes Stephen's build issue.
> 
> Yes, it does fix my x86_64 allnoconfig build.

Stephen, thanks!

Al, do you want to fold that change in?  Or shall I post another
version?

-- 
Josh