From: Conor Dooley <conor@kernel.org>
To: Guenter Roeck <linux@roeck-us.net>
Cc: Jisheng Zhang <jszhang@kernel.org>,
Palmer Dabbelt <palmer@dabbelt.com>,
Paul Walmsley <paul.walmsley@sifive.com>,
Albert Ou <aou@eecs.berkeley.edu>,
Anup Patel <anup@brainfault.org>,
Atish Patra <atishp@atishpatra.org>,
Heiko Stuebner <heiko@sntech.de>,
Andrew Jones <ajones@ventanamicro.com>,
Conor Dooley <conor.dooley@microchip.com>,
linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org,
kvm@vger.kernel.org, kvm-riscv@lists.infradead.org
Subject: Re: [PATCH v5 00/13] riscv: improve boot time isa extensions handling
Date: Sun, 12 Feb 2023 18:45:31 +0000 [thread overview]
Message-ID: <Y+kzy1y3Z3j3Ohs9@spud> (raw)
In-Reply-To: <48d2ac96-abdd-23bc-b167-08dc2c1a1dbe@roeck-us.net>
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On Sun, Feb 12, 2023 at 10:38:26AM -0800, Guenter Roeck wrote:
> On 2/12/23 10:20, Conor Dooley wrote:
> > On Sun, Feb 12, 2023 at 10:14:13AM -0800, Guenter Roeck wrote:
> > > On 2/12/23 10:06, Conor Dooley wrote:
> > > > On Sun, Feb 12, 2023 at 05:06:09PM +0000, Conor Dooley wrote:
> > > > > On Sun, Feb 12, 2023 at 04:33:58PM +0000, Conor Dooley wrote:
> > > > > > On Sun, Feb 12, 2023 at 03:59:59PM +0000, Conor Dooley wrote:
> > > > >
> > > > > So as not to lead anyone up the garden path, let me correct myself:
> > > > >
> > > > > > Hmm, so this appears to be us attempting to patch in alternatives where
> > > > > > none actually exists - seemingly F & D.
> > > > >
> > > > > And of course that's not true, riscv_has_extension_likely() now uses
> > > > > alternatives as of:
> > > > > bdda5d554e43 ("riscv: introduce riscv_has_extension_[un]likely()")
> > > > >
> > > > > From a quick look, it just happens that the only users are F & D.
> > > > >
> > > >
> > > > Samuel pointed out that this is a lockdep splat on irc.
> > > > There's a patch on the list that removes the lockdep annotation
> > > > entirely:
> > > > https://patchwork.kernel.org/project/linux-riscv/patch/20230202114116.3695793-1-changbin.du@huawei.com/
> > > >
> > > > So ye, no surprises that it was config based!
> > > >
> > > > Palmer posted a "better" fix for that lockdep warning a while ago:
> > > > https://lore.kernel.org/all/20220322022331.32136-1-palmer@rivosinc.com/
> > > >
> > > > So we'd have to duplicate/reuse that for cpufeature/errata patching.
> > > >
> > > >
> > >
> > > This does not (only) happen in stop_machine().
> >
> > Yah, sorry I meant that it's the same lockdep splat as is being
> > addressed there.
> > The first patch deletes the lockdep stuff entirely, so removes the
> > splat. I was thinking that we'd need to take Palmer's (IMO better)
> > patch and do the same thing for patching alternatives, but I figure we
> > can just take the text_mutex itself for alternatives & not have to
> > dance around the lock.
> >
> > I'll go do that I suppose!
>
> Thanks a lot for the clarification. That sounds like the backtrace
> can be largely ignored.
Yeah, sorry that I phrased that confusingly in the first place.
> However, I still see that the patch series
> results in boot hangs with the sifive_u qemu emulation, where
> the log ends with "Oops - illegal instruction". Is that problem
> being addressed as well ?
Hmm, if it died on the last commit in this series, then I am not sure.
If you meant with riscv/for-next or linux-next that's fixed by a patch
from Samuel:
https://patchwork.kernel.org/project/linux-riscv/patch/20230212021534.59121-3-samuel@sholland.org/
Cheers,
Conor.
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next prev parent reply other threads:[~2023-02-12 18:45 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-01-28 17:28 [PATCH v5 00/13] riscv: improve boot time isa extensions handling Jisheng Zhang
2023-01-28 17:28 ` [PATCH v5 01/13] riscv: move riscv_noncoherent_supported() out of ZICBOM probe Jisheng Zhang
2023-01-28 17:28 ` [PATCH v5 02/13] riscv: cpufeature: detect RISCV_ALTERNATIVES_EARLY_BOOT earlier Jisheng Zhang
2023-01-28 17:28 ` [PATCH v5 03/13] riscv: hwcap: make ISA extension ids can be used in asm Jisheng Zhang
2023-01-28 17:28 ` [PATCH v5 04/13] riscv: cpufeature: extend riscv_cpufeature_patch_func to all ISA extensions Jisheng Zhang
2023-01-28 17:28 ` [PATCH v5 05/13] riscv: introduce riscv_has_extension_[un]likely() Jisheng Zhang
2023-01-28 17:28 ` [PATCH v5 06/13] riscv: fpu: switch has_fpu() to riscv_has_extension_likely() Jisheng Zhang
2023-03-22 12:01 ` Jason A. Donenfeld
2023-03-22 12:09 ` [PATCH] riscv: require alternatives framework when selecting FPU support Jason A. Donenfeld
2023-03-22 12:46 ` Andrew Jones
2023-03-22 15:17 ` Conor Dooley
2023-03-22 19:26 ` Andrew Jones
2023-03-22 19:44 ` Conor Dooley
2023-03-22 20:05 ` Conor Dooley
2023-03-22 20:19 ` Jason A. Donenfeld
2023-03-23 14:49 ` Conor Dooley
2023-03-23 15:56 ` Jason A. Donenfeld
2023-03-23 22:19 ` Conor Dooley
2023-01-28 17:28 ` [PATCH v5 07/13] riscv: module: move find_section to module.h Jisheng Zhang
2023-01-28 17:28 ` [PATCH v5 08/13] riscv: module: Add ADD16 and SUB16 rela types Jisheng Zhang
2023-01-28 17:28 ` [PATCH v5 09/13] riscv: switch to relative alternative entries Jisheng Zhang
2023-01-28 17:28 ` [PATCH v5 10/13] riscv: alternative: patch alternatives in the vDSO Jisheng Zhang
2023-01-28 17:28 ` [PATCH v5 11/13] riscv: cpu_relax: switch to riscv_has_extension_likely() Jisheng Zhang
2023-01-28 17:28 ` [PATCH v5 12/13] riscv: KVM: Switch has_svinval() to riscv_has_extension_unlikely() Jisheng Zhang
2023-01-28 17:28 ` [PATCH v5 13/13] riscv: remove riscv_isa_ext_keys[] array and related usage Jisheng Zhang
2023-02-02 23:39 ` [PATCH v5 00/13] riscv: improve boot time isa extensions handling Palmer Dabbelt
2023-02-02 23:40 ` patchwork-bot+linux-riscv
2023-02-12 15:43 ` Guenter Roeck
2023-02-12 15:59 ` Conor Dooley
2023-02-12 16:33 ` Conor Dooley
2023-02-12 17:06 ` Conor Dooley
2023-02-12 18:06 ` Conor Dooley
2023-02-12 18:14 ` Guenter Roeck
2023-02-12 18:20 ` Conor Dooley
2023-02-12 18:38 ` Guenter Roeck
2023-02-12 18:45 ` Conor Dooley [this message]
2023-02-12 20:27 ` Guenter Roeck
2023-02-12 20:39 ` Conor Dooley
2023-02-12 22:21 ` Guenter Roeck
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