linux-kernel - Re: [PATCH 2/2] riscv: Fix Zbb alternative IDs

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Date:   Sun, 12 Feb 2023 15:20:36 +0000
From:   Conor Dooley <conor@...nel.org>
To:     Samuel Holland <samuel@...lland.org>
Cc:     Heiko Stuebner <heiko@...ech.de>,
        Jisheng Zhang <jszhang@...nel.org>,
        Palmer Dabbelt <palmer@...belt.com>,
        linux-riscv@...ts.infradead.org,
        Andrew Jones <ajones@...tanamicro.com>,
        Christoph Muellner <christoph.muellner@...ll.eu>,
        Conor Dooley <conor.dooley@...rochip.com>,
        Guo Ren <guoren@...nel.org>,
        Heiko Stuebner <heiko.stuebner@...ll.eu>,
        Nathan Chancellor <nathan@...nel.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] riscv: Fix Zbb alternative IDs

On Sat, Feb 11, 2023 at 08:15:33PM -0600, Samuel Holland wrote:
> Commit 4bf8860760d9 ("riscv: cpufeature: extend
> riscv_cpufeature_patch_func to all ISA extensions") switched ISA
> extension alternatives to use the RISCV_ISA_EXT_* macros instead of
> CPUFEATURE_*. This was mismerged when applied on top of the Zbb series,
> so the Zbb alternatives referenced the wrong errata ID values.
> 
> Fixes: 9daca9a5b9ac ("Merge patch series "riscv: improve boot time isa extensions handling"")

Re: your question on irc, I think you did the right thing here as
Jisheng did remove them in his series:
https://lore.kernel.org/linux-riscv/20230128172856.3814-5-jszhang@kernel.org/
Reviewed-by: Conor Dooley <conor.dooley@...rochip.com>

> Signed-off-by: Samuel Holland <samuel@...lland.org>
> ---
> 
>  arch/riscv/include/asm/errata_list.h | 5 -----
>  arch/riscv/lib/strcmp.S              | 2 +-
>  arch/riscv/lib/strlen.S              | 2 +-
>  arch/riscv/lib/strncmp.S             | 2 +-
>  4 files changed, 3 insertions(+), 8 deletions(-)
> 
> diff --git a/arch/riscv/include/asm/errata_list.h b/arch/riscv/include/asm/errata_list.h
> index e158439029ce..274c6f889602 100644
> --- a/arch/riscv/include/asm/errata_list.h
> +++ b/arch/riscv/include/asm/errata_list.h
> @@ -23,11 +23,6 @@
>  #define	ERRATA_THEAD_NUMBER 3
>  #endif
>  
> -#define	CPUFEATURE_SVPBMT 0
> -#define	CPUFEATURE_ZICBOM 1
> -#define	CPUFEATURE_ZBB 2
> -#define	CPUFEATURE_NUMBER 3
> -
>  #ifdef __ASSEMBLY__
>  
>  #define ALT_INSN_FAULT(x)						\
> diff --git a/arch/riscv/lib/strcmp.S b/arch/riscv/lib/strcmp.S
> index 8148b6418f61..986ab23fe787 100644
> --- a/arch/riscv/lib/strcmp.S
> +++ b/arch/riscv/lib/strcmp.S
> @@ -9,7 +9,7 @@
>  /* int strcmp(const char *cs, const char *ct) */
>  SYM_FUNC_START(strcmp)
>  
> -	ALTERNATIVE("nop", "j strcmp_zbb", 0, CPUFEATURE_ZBB, CONFIG_RISCV_ISA_ZBB)
> +	ALTERNATIVE("nop", "j strcmp_zbb", 0, RISCV_ISA_EXT_ZBB, CONFIG_RISCV_ISA_ZBB)
>  
>  	/*
>  	 * Returns
> diff --git a/arch/riscv/lib/strlen.S b/arch/riscv/lib/strlen.S
> index 0f9dbf93301a..8345ceeee3f6 100644
> --- a/arch/riscv/lib/strlen.S
> +++ b/arch/riscv/lib/strlen.S
> @@ -9,7 +9,7 @@
>  /* int strlen(const char *s) */
>  SYM_FUNC_START(strlen)
>  
> -	ALTERNATIVE("nop", "j strlen_zbb", 0, CPUFEATURE_ZBB, CONFIG_RISCV_ISA_ZBB)
> +	ALTERNATIVE("nop", "j strlen_zbb", 0, RISCV_ISA_EXT_ZBB, CONFIG_RISCV_ISA_ZBB)
>  
>  	/*
>  	 * Returns
> diff --git a/arch/riscv/lib/strncmp.S b/arch/riscv/lib/strncmp.S
> index 7940ddab2d48..ee49595075be 100644
> --- a/arch/riscv/lib/strncmp.S
> +++ b/arch/riscv/lib/strncmp.S
> @@ -9,7 +9,7 @@
>  /* int strncmp(const char *cs, const char *ct, size_t count) */
>  SYM_FUNC_START(strncmp)
>  
> -	ALTERNATIVE("nop", "j strncmp_zbb", 0, CPUFEATURE_ZBB, CONFIG_RISCV_ISA_ZBB)
> +	ALTERNATIVE("nop", "j strncmp_zbb", 0, RISCV_ISA_EXT_ZBB, CONFIG_RISCV_ISA_ZBB)
>  
>  	/*
>  	 * Returns
> -- 
> 2.37.4
> 

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