linux-kernel - Re: [RFC 6/7] x86: Move kernel_fpu

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Date:	Wed, 17 Jun 2009 18:46:22 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Huang Ying <ying.huang@...el.com>
Cc:	Herbert Xu <herbert@...dor.apana.org.au>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org, linux-crypto@...r.kernel.org
Subject: Re: [RFC 6/7] x86: Move kernel_fpu_using to asm/i387.h


* Huang Ying <ying.huang@...el.com> wrote:

> This is used by AES-NI accelerated AES implementation and PCLMULQDQ
> accelerated GHASH implementation.
> 
> Signed-off-by: Huang Ying <ying.huang@...el.com>
> 
> ---
>  arch/x86/crypto/aesni-intel_glue.c |    7 -------
>  arch/x86/include/asm/i387.h        |    7 +++++++
>  2 files changed, 7 insertions(+), 7 deletions(-)
> 
> --- a/arch/x86/crypto/aesni-intel_glue.c
> +++ b/arch/x86/crypto/aesni-intel_glue.c
> @@ -59,13 +59,6 @@ asmlinkage void aesni_cbc_enc(struct cry
>  asmlinkage void aesni_cbc_dec(struct crypto_aes_ctx *ctx, u8 *out,
>  			      const u8 *in, unsigned int len, u8 *iv);
>  
> -static inline int kernel_fpu_using(void)
> -{
> -	if (in_interrupt() && !(read_cr0() & X86_CR0_TS))
> -		return 1;
> -	return 0;
> -}
> -
>  static inline struct crypto_aes_ctx *aes_ctx(void *raw_ctx)
>  {
>  	unsigned long addr = (unsigned long)raw_ctx;
> --- a/arch/x86/include/asm/i387.h
> +++ b/arch/x86/include/asm/i387.h
> @@ -302,6 +302,13 @@ static inline void kernel_fpu_end(void)
>  	preempt_enable();
>  }
>  
> +static inline int kernel_fpu_using(void)
> +{
> +	if (in_interrupt() && !(read_cr0() & X86_CR0_TS))
> +		return 1;
> +	return 0;
> +}
> +

Looks sane to me. Herbert, do you ack it?

	Ingo
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