linux-kernel - Re: [PATCH 08/11] riscv: alternative: Add an ALTERNATIVE

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Message-ID: <20241115-1c2467159f117132dc94db26@orel>
Date: Fri, 15 Nov 2024 14:05:32 +0100
From: Andrew Jones <ajones@...tanamicro.com>
To: Samuel Holland <samuel.holland@...ive.com>
Cc: Palmer Dabbelt <palmer@...belt.com>, linux-riscv@...ts.infradead.org, 
	Conor Dooley <conor@...nel.org>, devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
	Alexandre Ghiti <alexghiti@...osinc.com>, Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>, 
	Emil Renner Berthing <kernel@...il.dk>, Rob Herring <robh+dt@...nel.org>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>
Subject: Re: [PATCH 08/11] riscv: alternative: Add an ALTERNATIVE_3 macro

On Fri, Nov 01, 2024 at 05:08:02PM -0700, Samuel Holland wrote:
> ALT_FIXUP_PMA() is already using ALTERNATIVE_2(), but needs to be
> extended to handle a fourth case. Add ALTERNATIVE_3(), which extends
> ALTERNATIVE_2() with another block of new content.
> 
> Signed-off-by: Samuel Holland <samuel.holland@...ive.com>
> ---
> 
>  arch/riscv/include/asm/alternative-macros.h | 45 ++++++++++++++++++---
>  1 file changed, 40 insertions(+), 5 deletions(-)
> 
> diff --git a/arch/riscv/include/asm/alternative-macros.h b/arch/riscv/include/asm/alternative-macros.h
> index 721ec275ce57..b6027a8b6b50 100644
> --- a/arch/riscv/include/asm/alternative-macros.h
> +++ b/arch/riscv/include/asm/alternative-macros.h
> @@ -50,8 +50,17 @@
>  	ALT_NEW_CONTENT \vendor_id_2, \patch_id_2, \enable_2, "\new_c_2"
>  .endm
>  
> +.macro ALTERNATIVE_CFG_3 old_c, new_c_1, vendor_id_1, patch_id_1, enable_1,	\
> +				new_c_2, vendor_id_2, patch_id_2, enable_2,	\
> +				new_c_3, vendor_id_3, patch_id_3, enable_3
> +	ALTERNATIVE_CFG_2 "\old_c", "\new_c_1", \vendor_id_1, \patch_id_1, \enable_1 \
> +				    "\new_c_2", \vendor_id_2, \patch_id_2, \enable_2 \

We don't want the '\' on the end of the above line.

> +	ALT_NEW_CONTENT \vendor_id_3, \patch_id_3, \enable_3, "\new_c_3"
> +.endm
> +
>  #define __ALTERNATIVE_CFG(...)		ALTERNATIVE_CFG __VA_ARGS__
>  #define __ALTERNATIVE_CFG_2(...)	ALTERNATIVE_CFG_2 __VA_ARGS__
> +#define __ALTERNATIVE_CFG_3(...)	ALTERNATIVE_CFG_3 __VA_ARGS__
>  
>  #else /* !__ASSEMBLY__ */
>  
> @@ -98,6 +107,13 @@
>  	__ALTERNATIVE_CFG(old_c, new_c_1, vendor_id_1, patch_id_1, enable_1)	\
>  	ALT_NEW_CONTENT(vendor_id_2, patch_id_2, enable_2, new_c_2)
>  
> +#define __ALTERNATIVE_CFG_3(old_c, new_c_1, vendor_id_1, patch_id_1, enable_1,	\
> +				   new_c_2, vendor_id_2, patch_id_2, enable_2,	\
> +				   new_c_3, vendor_id_3, patch_id_3, enable_3)	\
> +	__ALTERNATIVE_CFG_2(old_c, new_c_1, vendor_id_1, patch_id_1, enable_1,	\
> +				   new_c_2, vendor_id_2, patch_id_2, enable_2)	\
> +	ALT_NEW_CONTENT(vendor_id_3, patch_id_3, enable_3, new_c_3)
> +
>  #endif /* __ASSEMBLY__ */
>  
>  #define _ALTERNATIVE_CFG(old_c, new_c, vendor_id, patch_id, CONFIG_k)	\
> @@ -108,6 +124,13 @@
>  	__ALTERNATIVE_CFG_2(old_c, new_c_1, vendor_id_1, patch_id_1, IS_ENABLED(CONFIG_k_1),	\
>  				   new_c_2, vendor_id_2, patch_id_2, IS_ENABLED(CONFIG_k_2))
>  
> +#define _ALTERNATIVE_CFG_3(old_c, new_c_1, vendor_id_1, patch_id_1, CONFIG_k_1,		\
> +				  new_c_2, vendor_id_2, patch_id_2, CONFIG_k_2,		\
> +				  new_c_3, vendor_id_3, patch_id_3, CONFIG_k_3)		\
> +	__ALTERNATIVE_CFG_3(old_c, new_c_1, vendor_id_1, patch_id_1, IS_ENABLED(CONFIG_k_1),	\
> +				   new_c_2, vendor_id_2, patch_id_2, IS_ENABLED(CONFIG_k_2),	\
> +				   new_c_3, vendor_id_3, patch_id_3, IS_ENABLED(CONFIG_k_3))
> +
>  #else /* CONFIG_RISCV_ALTERNATIVE */
>  #ifdef __ASSEMBLY__
>  
> @@ -121,6 +144,9 @@
>  #define _ALTERNATIVE_CFG_2(old_c, ...)	\
>  	ALTERNATIVE_CFG old_c
>  
> +#define _ALTERNATIVE_CFG_3(old_c, ...)	\
> +	ALTERNATIVE_CFG old_c
> +
>  #else /* !__ASSEMBLY__ */
>  
>  #define __ALTERNATIVE_CFG(old_c)	\
> @@ -132,6 +158,9 @@
>  #define _ALTERNATIVE_CFG_2(old_c, ...)	\
>  	__ALTERNATIVE_CFG(old_c)
>  
> +#define _ALTERNATIVE_CFG_3(old_c, ...)	\
> +	__ALTERNATIVE_CFG(old_c)
> +
>  #endif /* __ASSEMBLY__ */
>  #endif /* CONFIG_RISCV_ALTERNATIVE */
>  
> @@ -152,15 +181,21 @@
>  	_ALTERNATIVE_CFG(old_content, new_content, vendor_id, patch_id, CONFIG_k)
>  
>  /*
> - * A vendor wants to replace an old_content, but another vendor has used
> - * ALTERNATIVE() to patch its customized content at the same location. In
> - * this case, this vendor can create a new macro ALTERNATIVE_2() based
> - * on the following sample code and then replace ALTERNATIVE() with
> - * ALTERNATIVE_2() to append its customized content.
> + * Variant of ALTERNATIVE() that supports two sets of replacement content.
>   */
>  #define ALTERNATIVE_2(old_content, new_content_1, vendor_id_1, patch_id_1, CONFIG_k_1,		\
>  				   new_content_2, vendor_id_2, patch_id_2, CONFIG_k_2)		\
>  	_ALTERNATIVE_CFG_2(old_content, new_content_1, vendor_id_1, patch_id_1, CONFIG_k_1,	\
>  					new_content_2, vendor_id_2, patch_id_2, CONFIG_k_2)
>  
> +/*
> + * Variant of ALTERNATIVE() that supports three sets of replacement content.
> + */
> +#define ALTERNATIVE_3(old_content, new_content_1, vendor_id_1, patch_id_1, CONFIG_k_1,		\
> +				   new_content_2, vendor_id_2, patch_id_2, CONFIG_k_2,		\
> +				   new_content_3, vendor_id_3, patch_id_3, CONFIG_k_3)		\
> +	_ALTERNATIVE_CFG_3(old_content, new_content_1, vendor_id_1, patch_id_1, CONFIG_k_1,	\
> +					new_content_2, vendor_id_2, patch_id_2, CONFIG_k_2,	\
> +					new_content_3, vendor_id_3, patch_id_3, CONFIG_k_3)
> +
>  #endif
> -- 
> 2.45.1
>

Otherwise,

Reviewed-by: Andrew Jones <ajones@...tanamicro.com>