linux-kernel - Re: sparc32 vs lib/mpi

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Message-ID: <CALLzPKZ8iR0TumBc5wa+BLTFZeo7ABv47O4P4d=sv8MaSzeTLA@mail.gmail.com>
Date:	Wed, 25 Jan 2012 13:05:28 +0200
From:	"Kasatkin, Dmitry" <dmitry.kasatkin@...el.com>
To:	Al Viro <viro@...iv.linux.org.uk>
Cc:	linux-kernel@...r.kernel.org, David Miller <davem@...emloft.net>
Subject: Re: sparc32 vs lib/mpi

On Sat, Jan 21, 2012 at 3:12 AM, Al Viro <viro@...iv.linux.org.uk> wrote:
>        I realize that very few people care about sparc32 these days,
> but...
>        a) __clz_tab[] is defined (with identical contents) in
> lib/mpi/mpi-bit.c and arch/sparc/lib/divdi3.S.  Linker is unhappy,
> of course...
>        b) the same thing ends up using __udiv_qrnnd(), which simply
> does not exist on sparc32.  There's a Cthulhu-scaring cascade of
> ifdefs in lib/mpi/longlong.h, with several variants of udiv_qrnnd()
> for sparc.  Unfortunately, it falls back on use of __udiv_qrnnd()...
> Note that arch/sparc/math-emu/sfp-util_32.h has a definition of
> udiv_qrnnd() which might match one of inline assembly variants in

Would need to test it and see how it works...

> lib/mpi/longlong.h.  Or not.  BTW, what the hell is LONGLONG_STANDALONE?
>

i see that it comes from gnupg code as it is, but do not see any
scripts which might define it.

>        Could somebody who might remember still remember that stuff
> come up with comments?  For now I'm disabling everything from
> INTEGRITY_SIGNATURE down to MPILIB on sparc32 cross-build, but it
> would be nice to get it at least somewhat sorted out...
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