linux-kernel - Re: [PATCH v3] MIPS: Implement ieee754 NAN2008 emulation mode

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <ZpER1TRlHOxUXtSZ@alpha.franken.de>
Date: Fri, 12 Jul 2024 13:21:57 +0200
From: Thomas Bogendoerfer <tsbogend@...ha.franken.de>
To: Jiaxun Yang <jiaxun.yang@...goat.com>
Cc: Jonathan Corbet <corbet@....net>, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-mips@...r.kernel.org,
	Philippe Mathieu-Daudé <philmd@...aro.org>
Subject: Re: [PATCH v3] MIPS: Implement ieee754 NAN2008 emulation mode

On Wed, Jun 12, 2024 at 09:38:19AM +0100, 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 correctness, while maintaining
> support for both NaN mode regardless of hardware capability.
> It is useful for multilib installation that have both types
> of binary exist in system.
> 
> Reviewed-by: Philippe Mathieu-Daudé <philmd@...aro.org>
> Signed-off-by: Jiaxun Yang <jiaxun.yang@...goat.com>
> ---
> Changes in v3:
> - Fix typo in commit message
> - Collect R-b tags
> - Link to v2: https://lore.kernel.org/r/20240511-mips_ieee754_emul-v2-1-af796ea21ef0@flygoat.com
> 
> Changes in v2:
> - Fix a typo
> - Link to v1: https://lore.kernel.org/r/20240507-mips_ieee754_emul-v1-1-1dc7c0d13cac@flygoat.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                    |  9 ++++++++-
>  4 files changed, 30 insertions(+), 2 deletions(-)

applied to mips-next.

Thomas.

-- 
Crap can work. Given enough thrust pigs will fly, but it's not necessarily a
good idea.                                                [ RFC1925, 2.3 ]