linux-kernel - Re: [PATCH 1/3] jump_label: Allow asm/jump

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Message-ID: <20150107113004.GJ7485@arm.com>
Date:	Wed, 7 Jan 2015 11:30:05 +0000
From:	Will Deacon <will.deacon@....com>
To:	Anton Blanchard <anton@...ba.org>
Cc:	"benh@...nel.crashing.org" <benh@...nel.crashing.org>,
	"paulus@...ba.org" <paulus@...ba.org>,
	"mpe@...erman.id.au" <mpe@...erman.id.au>,
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	Catalin Marinas <Catalin.Marinas@....com>,
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Subject: Re: [PATCH 1/3] jump_label: Allow asm/jump_label.h to be included in
 assembly

On Wed, Jan 07, 2015 at 10:35:56AM +0000, Anton Blanchard wrote:
> Wrap asm/jump_label.h for all archs with #ifndef __ASSEMBLY__.
> Since these are kernel only headers, we don't need #ifdef __KERNEL__
> so can simplify things a bit.
> 
> If an architecture wants to use jump labels in assembly, it
> will still need to define a macro to create the __jump_table
> entries (see ARCH_STATIC_BRANCH in the powerpc asm/jump_label.h
> for an example).
> 
> Signed-off-by: Anton Blanchard <anton@...ba.org>
> ---
>  arch/arm/include/asm/jump_label.h   | 5 ++---
>  arch/arm64/include/asm/jump_label.h | 8 ++++----
>  arch/mips/include/asm/jump_label.h  | 7 +++----
>  arch/s390/include/asm/jump_label.h  | 3 +++
>  arch/sparc/include/asm/jump_label.h | 5 ++---
>  arch/x86/include/asm/jump_label.h   | 5 ++---
>  6 files changed, 16 insertions(+), 17 deletions(-)

[...]

> diff --git a/arch/arm64/include/asm/jump_label.h b/arch/arm64/include/asm/jump_label.h
> index 076a1c7..c0e5165 100644
> --- a/arch/arm64/include/asm/jump_label.h
> +++ b/arch/arm64/include/asm/jump_label.h
> @@ -18,11 +18,12 @@
>   */
>  #ifndef __ASM_JUMP_LABEL_H
>  #define __ASM_JUMP_LABEL_H
> +
> +#ifndef __ASSEMBLY__
> +
>  #include <linux/types.h>
>  #include <asm/insn.h>
>  
> -#ifdef __KERNEL__
> -
>  #define JUMP_LABEL_NOP_SIZE		AARCH64_INSN_SIZE
>  
>  static __always_inline bool arch_static_branch(struct static_key *key)
> @@ -39,8 +40,6 @@ l_yes:
>  	return true;
>  }
>  
> -#endif /* __KERNEL__ */
> -
>  typedef u64 jump_label_t;
>  
>  struct jump_entry {
> @@ -49,4 +48,5 @@ struct jump_entry {
>  	jump_label_t key;
>  };
>  
> +#endif  /* __ASSEMBLY__ */
>  #endif	/* __ASM_JUMP_LABEL_H */

The arm64 bit looks fine to me:

  Acked-by: Will Deacon <will.deacon@....com>

Will
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