linux-kernel - Re: [PATCH v9 4/5] jump_label: adjust inline asm to be consistent

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Message-ID: <ZvwgcBzLwYkgsJ2u@arm.com>
Date: Tue, 1 Oct 2024 17:16:48 +0100
From: Catalin Marinas <catalin.marinas@....com>
To: Alice Ryhl <aliceryhl@...gle.com>
Cc: Steven Rostedt <rostedt@...dmis.org>,
	Masami Hiramatsu <mhiramat@...nel.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Peter Zijlstra <peterz@...radead.org>,
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	Benno Lossin <benno.lossin@...ton.me>,
	Andreas Hindborg <a.hindborg@...nel.org>,
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	linux-arm-kernel@...ts.infradead.org,
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	WANG Xuerui <kernel@...0n.name>, Bibo Mao <maobibo@...ngson.cn>,
	Tiezhu Yang <yangtiezhu@...ngson.cn>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Tianrui Zhao <zhaotianrui@...ngson.cn>, loongarch@...ts.linux.dev
Subject: Re: [PATCH v9 4/5] jump_label: adjust inline asm to be consistent

On Tue, Oct 01, 2024 at 01:30:01PM +0000, Alice Ryhl wrote:
> diff --git a/arch/arm64/include/asm/jump_label.h b/arch/arm64/include/asm/jump_label.h
> index a0a5bbae7229..424ed421cd97 100644
> --- a/arch/arm64/include/asm/jump_label.h
> +++ b/arch/arm64/include/asm/jump_label.h
> @@ -19,10 +19,14 @@
>  #define JUMP_TABLE_ENTRY(key, label)			\
>  	".pushsection	__jump_table, \"aw\"\n\t"	\
>  	".align		3\n\t"				\
> -	".long		1b - ., %l["#label"] - .\n\t"	\
> -	".quad		%c0 - .\n\t"			\
> -	".popsection\n\t"				\
> -	:  :  "i"(key) :  : label
> +	".long		1b - ., " label " - .\n\t"	\
> +	".quad		" key " - .\n\t"		\
> +	".popsection\n\t"
> +
> +/* This macro is also expanded on the Rust side. */
> +#define ARCH_STATIC_BRANCH_ASM(key, label)		\
> +	"1:	nop\n\t"				\
> +	JUMP_TABLE_ENTRY(key, label)
>  
>  static __always_inline bool arch_static_branch(struct static_key * const key,
>  					       const bool branch)
> @@ -30,8 +34,8 @@ static __always_inline bool arch_static_branch(struct static_key * const key,
>  	char *k = &((char *)key)[branch];
>  
>  	asm goto(
> -		"1:	nop					\n\t"
> -		JUMP_TABLE_ENTRY(k, l_yes)
> +		ARCH_STATIC_BRANCH_ASM("%c0", "%l[l_yes]")
> +		:  :  "i"(k) :  : l_yes
>  		);
>  
>  	return false;
> @@ -43,9 +47,11 @@ static __always_inline bool arch_static_branch_jump(struct static_key * const ke
>  						    const bool branch)
>  {
>  	char *k = &((char *)key)[branch];
> +
>  	asm goto(
>  		"1:	b		%l[l_yes]		\n\t"
> -		JUMP_TABLE_ENTRY(k, l_yes)
> +		JUMP_TABLE_ENTRY("%c0", "%l[l_yes]")
> +		:  :  "i"(k) :  : l_yes
>  		);
>  	return false;
>  l_yes:

For the arm64 changes:

Acked-by: Catalin Marinas <catalin.marinas@....com>