linux-kernel - Re: [PATCH v4 07/16] riscv: cpufeature: Extract common elements from extension checking

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Date: Wed, 1 May 2024 12:48:13 -0700
From: Charlie Jenkins <charlie@...osinc.com>
To: Conor Dooley <conor@...nel.org>
Cc: Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Paul Walmsley <paul.walmsley@...ive.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>, Guo Ren <guoren@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, Chen-Yu Tsai <wens@...e.org>,
	Jernej Skrabec <jernej.skrabec@...il.com>,
	Samuel Holland <samuel@...lland.org>,
	Conor Dooley <conor.dooley@...rochip.com>,
	Evan Green <evan@...osinc.com>,
	Clément Léger <cleger@...osinc.com>,
	Jonathan Corbet <corbet@....net>, Shuah Khan <shuah@...nel.org>,
	linux-riscv@...ts.infradead.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, Palmer Dabbelt <palmer@...osinc.com>,
	linux-arm-kernel@...ts.infradead.org, linux-sunxi@...ts.linux.dev,
	linux-doc@...r.kernel.org, linux-kselftest@...r.kernel.org
Subject: Re: [PATCH v4 07/16] riscv: cpufeature: Extract common elements from
 extension checking

On Wed, May 01, 2024 at 12:37:14PM +0100, Conor Dooley wrote:
> On Fri, Apr 26, 2024 at 02:29:21PM -0700, Charlie Jenkins wrote:
> > The __riscv_has_extension_likely() and __riscv_has_extension_unlikely()
> > functions from the vendor_extensions.h can be used to simplify the
> > standard extension checking code as well. Migrate those functions to
> > cpufeature.h and reorganize the code in the file to use the functions.
> > 
> > Signed-off-by: Charlie Jenkins <charlie@...osinc.com>
> > ---
> >  arch/riscv/include/asm/cpufeature.h        | 78 +++++++++++++++++-------------
> >  arch/riscv/include/asm/vendor_extensions.h | 28 -----------
> >  2 files changed, 44 insertions(+), 62 deletions(-)
> > 
> > diff --git a/arch/riscv/include/asm/cpufeature.h b/arch/riscv/include/asm/cpufeature.h
> > index fedd479ccfd1..17896ec9ec11 100644
> > --- a/arch/riscv/include/asm/cpufeature.h
> > +++ b/arch/riscv/include/asm/cpufeature.h
> > @@ -98,59 +98,66 @@ extern bool riscv_isa_fallback;
> >  
> >  unsigned long riscv_isa_extension_base(const unsigned long *isa_bitmap);
> >  
> > +#define EXT_ALL_VENDORS		0
> 
> It's not really "all vendors", it's standard. Otherwise, this seems all

This hooks up into the alternatives:

ALTERNATIVE("nop", "j	%l[l_yes]", %[vendor], %[ext], 1)

Where the "vendor" argument is supposed to be 0 if the alternative is
applicable to all vendors. Is there a better way to convey this?

- Charlie

> grand to me,
> Reviewed-by: Conor Dooley <conor.dooley@...rochip.com>
> 
> Cheers,
> Conor.