linux-kernel - Re: [PATCH 3/3] arm64: stacktrace: Convert to ARCH

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Message-ID: <alpine.LSU.2.21.2007171105250.21694@pobox.suse.cz>
Date:   Fri, 17 Jul 2020 11:06:31 +0200 (CEST)
From:   Miroslav Benes <mbenes@...e.cz>
To:     Mark Brown <broonie@...nel.org>
cc:     Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        Christian Borntraeger <borntraeger@...ibm.com>,
        Ingo Molnar <mingo@...nel.org>,
        Jiri Slaby <jirislaby@...nel.org>, x86@...nel.org,
        linux-arm-kernel@...ts.infradead.org, linux-s390@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] arm64: stacktrace: Convert to ARCH_STACKWALK

On Thu, 16 Jul 2020, Mark Brown wrote:

> On Thu, Jul 16, 2020 at 01:56:13PM +0200, Miroslav Benes wrote:
> > On Wed, 15 Jul 2020, Mark Brown wrote:
> 
> > > -void save_stack_trace(struct stack_trace *trace)
> > > -{
> > > -	__save_stack_trace(current, trace, 0);
> > > +	walk_stackframe(task, &frame, consume_entry, cookie);
> > >  }
> 
> > just an idea for further improvement (and it might be a matter of taste). 
> 
> Yeah, there's some more stuff that can be done - the reason I'm looking
> at this code is to do reliable stack trace which is going to require at
> least some changes to the actual unwinder, this just seemed like a
> useful block moving things forwards in itself and I particularly wanted
> feedback on patch 1.

Understood. Reliable stack traces would be an important step for live 
patching on arm64, so I am looking forward to seeing that.

Thanks
Miroslav