linux-kernel - Re: [PATCH v3 06/17] riscv: Fix extension subset checking

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Message-ID: <20240424-gondola-cosmic-b7a02b2a8619@spud>
Date: Wed, 24 Apr 2024 16:21:05 +0100
From: Conor Dooley <conor@...nel.org>
To: Charlie Jenkins <charlie@...osinc.com>
Cc: Alexandre Ghiti <alex@...ti.fr>, 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 v3 06/17] riscv: Fix extension subset checking

On Wed, Apr 24, 2024 at 11:13:40AM -0400, Charlie Jenkins wrote:
> On Wed, Apr 24, 2024 at 03:51:54PM +0100, Conor Dooley wrote:
> > On Wed, Apr 24, 2024 at 04:22:02PM +0200, Alexandre Ghiti wrote:
> > > Hi Charlie,
> > > 
> > > On 21/04/2024 03:04, Charlie Jenkins wrote:
> > > > This loop is supposed to check if ext->subset_ext_ids[j] is valid, rather
> > > > than if ext->subset_ext_ids[i] is valid, before setting the extension
> > > > id ext->subset_ext_ids[j] in isainfo->isa.
> > > > 
> > > > Signed-off-by: Charlie Jenkins <charlie@...osinc.com>
> > > > Reviewed-by: Conor Dooley <conor.dooley@...rochip.com>
> > > > Fixes: 0d8295ed975b ("riscv: add ISA extension parsing for scalar crypto")
> > > > ---
> > > >   arch/riscv/kernel/cpufeature.c | 2 +-
> > > >   1 file changed, 1 insertion(+), 1 deletion(-)
> > > > 
> > > > diff --git a/arch/riscv/kernel/cpufeature.c b/arch/riscv/kernel/cpufeature.c
> > > > index 48874aac4871..b537731cadef 100644
> > > > --- a/arch/riscv/kernel/cpufeature.c
> > > > +++ b/arch/riscv/kernel/cpufeature.c
> > > > @@ -609,7 +609,7 @@ static int __init riscv_fill_hwcap_from_ext_list(unsigned long *isa2hwcap)
> > > >   			if (ext->subset_ext_size) {
> > > >   				for (int j = 0; j < ext->subset_ext_size; j++) {
> > > > -					if (riscv_isa_extension_check(ext->subset_ext_ids[i]))
> > > > +					if (riscv_isa_extension_check(ext->subset_ext_ids[j]))
> > > >   						set_bit(ext->subset_ext_ids[j], isainfo->isa);
> > > >   				}
> > > >   			}
> > > > 
> > > 
> > > I think this should go into -fixes, let's check with Palmer if he wants to
> > > take this patch only or if you should send the patch on its own.
> > 
> > I think splitting out this and patch 1 into a new series targeting fixes
> > would probably make things clearer?
> 
> Okay I can do that. I will give it a bit more time before I send this
> series split into two to allow time for the rest of the patches to
> gather comments so I avoid sending too many duplicate patches.

Ye, I do hope to get back to this series later in the week when I have
time to actually read through all of the patches in detail.

However, you wouldn't have to resend both parts of the series - you can
just split out the fixes portion and send that, leaving the rest of the
series sitting on the list to gather comments.

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