linux-kernel - Re: [PATCH] MIPS: Implement ieee754 NAN2008 emulation mode

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Message-ID: <e3cc1552-4f96-4aa0-a375-a5582094c1ae@linaro.org>
Date: Mon, 27 May 2024 14:38:36 +0200
From: Philippe Mathieu-Daudé <philmd@...aro.org>
To: Jiaxun Yang <jiaxun.yang@...goat.com>, Jonathan Corbet <corbet@....net>,
 Thomas Bogendoerfer <tsbogend@...ha.franken.de>
Cc: linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-mips@...r.kernel.org
Subject: Re: [PATCH] MIPS: Implement ieee754 NAN2008 emulation mode

On 7/5/24 14:34, Jiaxun Yang wrote:
> Implement ieee754 NAN2008 emulation mode.
> 
> When this mode is enabled, kernel will accept ELF file
> compiled for both NaN 2008 and NaN legacy, but if hardware
> does not have capability to match ELF's NaN mode, __own_fpu
> will fail for corresponding thread and fpuemu will then kick
> in.
> 
> This mode trade performance for corretness, while maintaining

"correctness"

> support for both NaN mode regardless of hardware capability.
> It is useful for multilib installation that have both types
> of binary exist in system.
> 
> Signed-off-by: Jiaxun Yang <jiaxun.yang@...goat.com>
> ---
>   Documentation/admin-guide/kernel-parameters.txt |  4 +++-
>   arch/mips/include/asm/fpu.h                     | 15 +++++++++++++++
>   arch/mips/kernel/elf.c                          |  4 ++++
>   arch/mips/kernel/fpu-probe.c                    | 10 +++++++++-
>   4 files changed, 31 insertions(+), 2 deletions(-)

Reviewed-by: Philippe Mathieu-Daudé <philmd@...aro.org>