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From: Guenter Roeck <linux@roeck-us.net>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: linux-kernel@vger.kernel.org, stable@vger.kernel.org,
	Paul Burton <paul.burton@mips.com>,
	Huacai Chen <chenhc@lemote.com>,
	Jiaxun Yang <jiaxun.yang@flygoat.com>,
	linux-mips@vger.kernel.org
Subject: Re: [PATCH 4.19 66/81] MIPS: Disable Loongson MMI instructions for kernel build
Date: Wed, 26 Aug 2020 14:06:28 -0700	[thread overview]
Message-ID: <20200826210628.GA173536@roeck-us.net> (raw)
In-Reply-To: <20191016214845.344235056@linuxfoundation.org>

Hi,

On Wed, Oct 16, 2019 at 02:51:17PM -0700, Greg Kroah-Hartman wrote:
> From: Paul Burton <paul.burton@mips.com>
> 
> commit 2f2b4fd674cadd8c6b40eb629e140a14db4068fd upstream.
> 
> GCC 9.x automatically enables support for Loongson MMI instructions when
> using some -march= flags, and then errors out when -msoft-float is
> specified with:
> 
>   cc1: error: ‘-mloongson-mmi’ must be used with ‘-mhard-float’
> 
> The kernel shouldn't be using these MMI instructions anyway, just as it
> doesn't use floating point instructions. Explicitly disable them in
> order to fix the build with GCC 9.x.
> 

I still see this problem when trying to compile fuloong2e_defconfig with
gcc 9.x or later. Reason seems to be that the patch was applied to
arch/mips/loongson64/Platform, but fuloong2e_defconfig uses
arch/mips/loongson2ef/Platform.

Am I missing something ?

Thanks,
Guenter

  reply	other threads:[~2020-08-26 21:06 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20191016214805.727399379@linuxfoundation.org>
2019-10-16 21:51 ` [PATCH 4.19 66/81] MIPS: Disable Loongson MMI instructions for kernel build Greg Kroah-Hartman
2020-08-26 21:06   ` Guenter Roeck [this message]
2020-09-03  9:26     ` Greg Kroah-Hartman
2020-09-07  3:35       ` Philippe Mathieu-Daudé
2020-09-24 13:54         ` Thomas Bogendoerfer
2019-10-16 21:51 ` [PATCH 4.19 67/81] MIPS: elf_hwcap: Export userspace ASEs Greg Kroah-Hartman

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