linux-kernel - Re: [PATCH 3/4] arm64: LLVMLinux: Calculate current_thread_info from current_stack

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Date:	Thu, 31 Jul 2014 07:31:30 +0200
From:	Andreas Färber <afaerber@...e.de>
To:	behanw@...verseincode.com, ard.biesheuvel@...aro.org,
	catalin.marinas@....com, k.khlebnikov@...sung.com, olof@...om.net,
	peterz@...radead.org, takahiro.akashi@...aro.org,
	tglx@...utronix.de, will.deacon@....com
CC:	linux-kernel@...r.kernel.org, Mark Charlebois <charlebm@...il.com>,
	dwmw2@...radead.org, mingo@...nel.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 3/4] arm64: LLVMLinux: Calculate current_thread_info from
 current_stack_pointer

Hi,

Am 31.07.2014 01:57, schrieb behanw@...verseincode.com:
> From: Behan Webster <behanw@...verseincode.com>
> 
> Use the global current_stack_pointer to get the value of the stack pointer.
> This change supports being able to compile the kernel with both gcc and clang.
> 
> Signed-off-by: Behan Webster <behanw@...verseincode.com>
> Signed-off-by: Mark Charlebois <charlebm@...il.com>
> Reviewed-by: Jan-Simon M??ller <dl9pf@....de>

Something went wrong with ö encoding here and in 2/4.

> ---
>  arch/arm64/include/asm/thread_info.h | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/arm64/include/asm/thread_info.h b/arch/arm64/include/asm/thread_info.h
> index e6b6094..c2432d2 100644
> --- a/arch/arm64/include/asm/thread_info.h
> +++ b/arch/arm64/include/asm/thread_info.h
> @@ -80,8 +80,8 @@ static inline struct thread_info *current_thread_info(void) __attribute_const__;
>  
>  static inline struct thread_info *current_thread_info(void)
>  {
> -	register unsigned long sp asm ("sp");
> -	return (struct thread_info *)(sp & ~(THREAD_SIZE - 1));
> +	return (struct thread_info *) \

This is not a macro, so \ seems superfluous.

Looks okay otherwise.

Regards,
Andreas

> +		(current_stack_pointer & ~(THREAD_SIZE - 1));
>  }
>  
>  #define thread_saved_pc(tsk)	\

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