linux-kernel - Re: [PATCH] MPILIB: disable usage of floating point registers on parisc

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Date:	Fri, 31 May 2013 17:43:19 +0300
From:	Dmitry Kasatkin <dmitry.s.kasatkin@...il.com>
To:	Helge Deller <deller@....de>
Cc:	Dmitry Kasatkin <dmitry.kasatkin@...el.com>,
	Linux Kernel Development <linux-kernel@...r.kernel.org>,
	linux-parisc@...r.kernel.org
Subject: Re: [PATCH] MPILIB: disable usage of floating point registers on parisc

Sorry. I am not at @intel.com any more. Did not see it.
Will handle.

- Dmitry


On Mon, May 6, 2013 at 1:08 AM, Helge Deller <deller@....de> wrote:
> The umul_ppmm() macro for parisc uses the xmpyu assembler statement
> which does calculation via a floating point register.
>
> But usage of floating point registers inside the Linux kernel are not
> allowed and gcc will stop compilation due to the -mdisable-fpregs
> compiler option.
>
> Fix this by disabling the umul_ppmm() and udiv_qrnnd() macros. The
> mpilib will then use the generic built-in implementations instead.
>
> Signed-off-by: Helge Deller <deller@....de>
>
> diff --git a/lib/mpi/longlong.h b/lib/mpi/longlong.h
> index 095ab15..d411355 100644
> --- a/lib/mpi/longlong.h
> +++ b/lib/mpi/longlong.h
> @@ -318,7 +318,8 @@ extern UDItype __udiv_qrnnd();
>              "rM" ((USItype)(bh)), \
>              "rM" ((USItype)(al)), \
>              "rM" ((USItype)(bl)))
> -#if defined(_PA_RISC1_1)
> +#if 0 && defined(_PA_RISC1_1)
> +/* xmpyu uses floating point register which is not allowed in Linux kernel. */
>  #define umul_ppmm(wh, wl, u, v) \
>  do { \
>         union {UDItype __ll; \
> @@ -337,7 +338,7 @@ do { \
>  #define UMUL_TIME 40
>  #define UDIV_TIME 80
>  #endif
> -#ifndef LONGLONG_STANDALONE
> +#if 0 /* #ifndef LONGLONG_STANDALONE */
>  #define udiv_qrnnd(q, r, n1, n0, d) \
>  do { USItype __r; \
>         (q) = __udiv_qrnnd(&__r, (n1), (n0), (d)); \
> --
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