linux-kernel - Re: [PATCH 1/2] RISC-V: fix ordering of Zbb extension

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Date:   Thu, 09 Feb 2023 00:26:50 +0100
From:   Heiko Stübner <heiko@...ech.de>
To:     palmer@...osinc.com, Conor Dooley <conor@...nel.org>
Cc:     linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org,
        christoph.muellner@...ll.eu, ajones@...tanamicro.com
Subject: Re: [PATCH 1/2] RISC-V: fix ordering of Zbb extension

Am Donnerstag, 9. Februar 2023, 00:20:10 CET schrieb Conor Dooley:
> Hey Heiko,
> 
> On 8 February 2023 22:53:27 GMT, Heiko Stuebner <heiko@...ech.de> wrote:
> >From: Heiko Stuebner <heiko.stuebner@...ll.eu>
> >
> >As Andrew reported,
> >    Zb* comes after Zi* according 27.11 "Subset Naming Convention"
> >so fix the ordering accordingly.
> >
> >Reported-by: Andrew Jones <ajones@...tanamicro.com>
> >Signed-off-by: Heiko Stuebner <heiko.stuebner@...ll.eu>
> 
> The whole "getting it wrong immediately after fixing it up" ;)
> 
> Reviewed-by: Conor Dooley <conor.dooley@...rochip.com>

I'm still hopefully that I'll learn at some point that "b" comes after "i",
at least with riscv extensions. Decades of sorting the other way around are
hard to break :-D .

> >---
> > arch/riscv/kernel/cpu.c | 2 +-
> > 1 file changed, 1 insertion(+), 1 deletion(-)
> >
> >diff --git a/arch/riscv/kernel/cpu.c b/arch/riscv/kernel/cpu.c
> >index 420228e219f7..8400f0cc9704 100644
> >--- a/arch/riscv/kernel/cpu.c
> >+++ b/arch/riscv/kernel/cpu.c
> >@@ -185,9 +185,9 @@ arch_initcall(riscv_cpuinfo_init);
> >  * New entries to this struct should follow the ordering rules described above.
> >  */
> > static struct riscv_isa_ext_data isa_ext_arr[] = {
> >-	__RISCV_ISA_EXT_DATA(zbb, RISCV_ISA_EXT_ZBB),
> > 	__RISCV_ISA_EXT_DATA(zicbom, RISCV_ISA_EXT_ZICBOM),
> > 	__RISCV_ISA_EXT_DATA(zihintpause, RISCV_ISA_EXT_ZIHINTPAUSE),
> >+	__RISCV_ISA_EXT_DATA(zbb, RISCV_ISA_EXT_ZBB),
> > 	__RISCV_ISA_EXT_DATA(sscofpmf, RISCV_ISA_EXT_SSCOFPMF),
> > 	__RISCV_ISA_EXT_DATA(sstc, RISCV_ISA_EXT_SSTC),
> > 	__RISCV_ISA_EXT_DATA(svinval, RISCV_ISA_EXT_SVINVAL),
>