linux-kernel - Re: [PATCH v2 4/6] RISC-V: Detect unaligned vector accesses supported.

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Message-ID: <20240614-broadly-lucrative-d2c1e746ee32@spud>
Date: Fri, 14 Jun 2024 15:32:11 +0100
From: Conor Dooley <conor@...nel.org>
To: Jesse Taube <jesse@...osinc.com>
Cc: Conor Dooley <conor.dooley@...rochip.com>,
	linux-riscv@...ts.infradead.org, Jonathan Corbet <corbet@....net>,
	Paul Walmsley <paul.walmsley@...ive.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Clément Léger <cleger@...osinc.com>,
	Evan Green <evan@...osinc.com>,
	Andrew Jones <ajones@...tanamicro.com>,
	Charlie Jenkins <charlie@...osinc.com>,
	Xiao Wang <xiao.w.wang@...el.com>, Andy Chiu <andy.chiu@...ive.com>,
	Eric Biggers <ebiggers@...gle.com>,
	Greentime Hu <greentime.hu@...ive.com>,
	Björn Töpel <bjorn@...osinc.com>,
	Heiko Stuebner <heiko@...ech.de>,
	Costa Shulyupin <costa.shul@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Baoquan He <bhe@...hat.com>, Anup Patel <apatel@...tanamicro.com>,
	Zong Li <zong.li@...ive.com>,
	Sami Tolvanen <samitolvanen@...gle.com>,
	Ben Dooks <ben.dooks@...ethink.co.uk>,
	Alexandre Ghiti <alexghiti@...osinc.com>,
	"Gustavo A. R. Silva" <gustavoars@...nel.org>,
	Erick Archer <erick.archer@....com>,
	Joel Granados <j.granados@...sung.com>, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH v2 4/6] RISC-V: Detect unaligned vector accesses
 supported.

On Fri, Jun 14, 2024 at 10:28:17AM -0400, Jesse Taube wrote:
> 
> 
> On 6/14/24 04:40, Conor Dooley wrote:
> > On Fri, Jun 14, 2024 at 09:36:55AM +0100, Conor Dooley wrote:
> > > On Thu, Jun 13, 2024 at 03:16:13PM -0400, Jesse Taube wrote:
> > > > --- a/arch/riscv/kernel/unaligned_access_speed.c
> > > > +++ b/arch/riscv/kernel/unaligned_access_speed.c
> > > > @@ -19,7 +19,8 @@
> > > >   #define MISALIGNED_BUFFER_ORDER get_order(MISALIGNED_BUFFER_SIZE)
> > > >   #define MISALIGNED_COPY_SIZE ((MISALIGNED_BUFFER_SIZE / 2) - 0x80)
> > > > -DEFINE_PER_CPU(long, misaligned_access_speed);
> > > > +DEFINE_PER_CPU(long, misaligned_access_speed) = RISCV_HWPROBE_MISALIGNED_UNKNOWN;
> > > > +DEFINE_PER_CPU(long, vector_misaligned_access) = RISCV_HWPROBE_VEC_MISALIGNED_UNSUPPORTED;
> > > >   #ifdef CONFIG_RISCV_PROBE_UNALIGNED_ACCESS
> > > >   static cpumask_t fast_misaligned_access;
> > > > @@ -268,12 +269,18 @@ static int check_unaligned_access_all_cpus(void)
> > > >   	if (riscv_has_extension_unlikely(RISCV_ISA_EXT_ZICCLSM)) {
> > > >   		for_each_online_cpu(cpu) {
> > > > +#ifdef CONFIG_RISCV_VECTOR_MISALIGNED
> > > > +			per_cpu(vector_misaligned_access, cpu) = RISCV_HWPROBE_VEC_MISALIGNED_FAST;
> > > > +#endif
> > > > +#ifdef CONFIG_RISCV_MISALIGNED
> > > >   			per_cpu(misaligned_access_speed, cpu) = RISCV_HWPROBE_MISALIGNED_FAST;
> > > > +#endif
> > > 
> > > Can you IS_ENABLED()-ify these two as well please?
> > 
> > Ah, you can't cos the variable doesn't exist in the other case.
> 
> Yeah kinda just dealing with how it was originally written ideally we would
> use IS_ENABLED. I don't really want to have a 500+ diff patch
> IS_ENABLED()-ifying the original code as well. I can do that if necessary
> though.

No, dw about it. I made a mistake.

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