linux-kernel - Re: [PATCH 7/9] LoongArch: Tweak CFLAGS for Clang compatibility

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Message-ID: <64955942-274c-047d-aab3-308fbbe6dfbc@xen0n.name>
Date:   Sat, 24 Jun 2023 01:06:59 +0800
From:   WANG Xuerui <kernel@...0n.name>
To:     Xi Ruoyao <xry111@...111.site>, Huacai Chen <chenhuacai@...nel.org>
Cc:     WANG Rui <wangrui@...ngson.cn>, loongarch@...ts.linux.dev,
        linux-kbuild@...r.kernel.org, llvm@...ts.linux.dev,
        linux-kernel@...r.kernel.org, WANG Xuerui <git@...0n.name>
Subject: Re: [PATCH 7/9] LoongArch: Tweak CFLAGS for Clang compatibility

On 6/24/23 01:00, Xi Ruoyao wrote:
> On Fri, 2023-06-23 at 21:43 +0800, WANG Xuerui wrote:
>
>> -cflags-y                       += -G0 -pipe -msoft-float
> -msoft-float should not be removed.  Our consensus (made when I was
> developing https://gcc.gnu.org/r13-6500) is -mabi=lp64s does *not*
> disable floating point instructions, but only disable FPRs for passing
> arguments and return values.  So w/o -msoft-float (or -mfpu=none) GCC is
> allowed to generate FP instructions everywhere in kernel and it may
> cause kernel FPD exception in the future.
Hmm, now I remember (still vaguely) about the discussion... I'll have to 
check how to minimize churn around FPU-touching code though if 
-msoft-float is to be kept.

-- 
WANG "xen0n" Xuerui

Linux/LoongArch mailing list: https://lore.kernel.org/loongarch/