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

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Message-ID: <Zn1FuxNw2CUttzdg@alpha.franken.de>
Date: Thu, 27 Jun 2024 12:58:03 +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:
> +++ b/arch/mips/kernel/elf.c
> @@ -318,6 +318,10 @@ void mips_set_personality_nan(struct arch_elf_state *state)
>  	t->thread.fpu.fcr31 = c->fpu_csr31;
>  	switch (state->nan_2008) {
>  	case 0:
> +		if (!(c->fpu_msk31 & FPU_CSR_NAN2008))
> +			t->thread.fpu.fcr31 &= ~FPU_CSR_NAN2008;
> +		if (!(c->fpu_msk31 & FPU_CSR_ABS2008))
> +			t->thread.fpu.fcr31 &= ~FPU_CSR_ABS2008;

why is this needed ?

Thomas.

-- 
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