linux-kernel - Re: [PATCH -v2 6/8] jump_label: Add a new static

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Date:	Tue, 28 Jul 2015 19:00:55 +0200
From:	Rabin Vincent <rabin@....in>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	linux-kernel@...r.kernel.org, mingo@...nel.org,
	jasonbaron0@...il.com, bp@...en8.de, luto@...capital.net,
	tglx@...utronix.de, rostedt@...dmis.org, will.deacon@....com,
	liuj97@...il.com, ralf@...ux-mips.org, ddaney@...iumnetworks.com,
	benh@...nel.crashing.org, michael@...erman.id.au,
	heiko.carstens@...ibm.com, davem@...emloft.net, vbabka@...e.cz
Subject: Re: [PATCH -v2 6/8] jump_label: Add a new static_key interface

On Tue, Jul 28, 2015 at 03:21:01PM +0200, Peter Zijlstra wrote:
> --- a/arch/arm/include/asm/jump_label.h
> +++ b/arch/arm/include/asm/jump_label.h
> @@ -7,20 +7,28 @@
>  
>  #define JUMP_LABEL_NOP_SIZE 4
>  
> -#ifdef CONFIG_THUMB2_KERNEL
> -#define JUMP_LABEL_NOP	"nop.w"
> -#else
> -#define JUMP_LABEL_NOP	"nop"
> -#endif
> +static __always_inline bool arch_static_branch(struct static_key *key, bool branch)
> +{
> +	asm_volatile_goto("1:\n\t"
> +		 WASM(nop) "\n\t"
> +		 ".pushsection __jump_table,  \"aw\"\n\t"
> +		 ".word 1b, %l[l_yes], %c0\n\t"
> +		 ".popsection\n\t"
> +		 : :  "i" (&((char *)key)[branch]) :  : l_yes);
> +
> +	return false;
> +l_yes:
> +	return true;
> +}
>  
> -static __always_inline bool arch_static_branch(struct static_key *key)
> +static __always_inline bool arch_static_branch_jump(struct static_key *key, bool branch)
>  {
>  	asm_volatile_goto("1:\n\t"
> -		 JUMP_LABEL_NOP "\n\t"
> +		 WASM(b) " %l[l_yes]\n\t"
>  		 ".pushsection __jump_table,  \"aw\"\n\t"
>  		 ".word 1b, %l[l_yes], %c0\n\t"
>  		 ".popsection\n\t"
> -		 : :  "i" (key) :  : l_yes);
> +		 : :  "i" (&((char *)key)[branch]) :  : l_yes);
>  
>  	return false;
>  l_yes:

This is missing an include of asm/unified.h for the WASM():

diff --git a/arch/arm/include/asm/jump_label.h b/arch/arm/include/asm/jump_label.h
index f8bc12f..34f7b69 100644
--- a/arch/arm/include/asm/jump_label.h
+++ b/arch/arm/include/asm/jump_label.h
@@ -4,6 +4,7 @@
 #ifndef __ASSEMBLY__
 
 #include <linux/types.h>
+#include <asm/unified.h>
 
 #define JUMP_LABEL_NOP_SIZE 4

With that added, it builds and works fine on ARM.
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