linux-kernel - Re: 32-bit poweroc compile failure in v4.19-rc7-166-g7ec21823634d

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Message-ID: <7c9c56d8-df58-eac7-e41e-8d2746f1c0d5@linux.ee>
Date:   Mon, 15 Oct 2018 15:20:21 +0300
From:   Meelis Roos <mroos@...ux.ee>
To:     Michael Ellerman <mpe@...erman.id.au>,
        linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: Re: 32-bit poweroc compile failure in v4.19-rc7-166-g7ec21823634d

>> I tried to test the fix to 32-bit poweroc boot hang but found that current git does not compile on 32bit poweroc at all for me:
> 
> That's GCC 8 I think?

Yes, gcc version 8.2.0 (Debian 8.2.0-7).

> I have seen that but couldn't work out what the hell GCC is thinking.
> 
> I don't think there's an actual bug, the size of the copy is bounded by
> the count parameter, which *doesn't* come from user space, it's hard
> coded.
> 
> I suspect the logic is just to convoluted for GCC.
> 
> We should fix it somehow, but I haven't worked out what's the best option.
> 
> cheers

-- 
Meelis Roos <mroos@...ux.ee>