linux-kernel - Re: [PATCH 08/10] clocksource/drivers/hyper-v: Handle sched

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Date:   Thu, 4 Feb 2021 16:31:31 +0000
From:   Wei Liu <wei.liu@...nel.org>
To:     Michael Kelley <mikelley@...rosoft.com>
Cc:     Wei Liu <wei.liu@...nel.org>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        KY Srinivasan <kys@...rosoft.com>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "bp@...en8.de" <bp@...en8.de>, "hpa@...or.com" <hpa@...or.com>,
        "daniel.lezcano@...aro.org" <daniel.lezcano@...aro.org>,
        "arnd@...db.de" <arnd@...db.de>,
        "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "x86@...nel.org" <x86@...nel.org>,
        "linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>
Subject: Re: [PATCH 08/10] clocksource/drivers/hyper-v: Handle sched_clock
 differences inline

On Thu, Feb 04, 2021 at 04:28:38PM +0000, Michael Kelley wrote:
> From: Wei Liu <wei.liu@...nel.org> Sent: Monday, February 1, 2021 10:55 AM
> > 
> > On Wed, Jan 27, 2021 at 12:23:43PM -0800, Michael Kelley wrote:
> > [...]
> > > +/*
> > > + * Reference to pv_ops must be inline so objtool
> > > + * detection of noinstr violations can work correctly.
> > > + */
> > > +static __always_inline void hv_setup_sched_clock(void *sched_clock)
> > 
> > sched_clock_register is not trivial. Having __always_inline here is
> > going to make the compiled object bloated.
> > 
> > Given this is a static function, I don't think we need to specify any
> > inline keyword. The compiler should be able to determine whether this
> > function should be inlined all by itself.
> > 
> > Wei.
> 
> There was an explicit request from Peter Zijlstra and Thomas Gleixner
> to force it inline.  See https://lore.kernel.org/patchwork/patch/1283635/ and
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/arch/x86/include/asm/mshyperv.h?id=b9d8cf2eb3ceecdee3434b87763492aee9e28845

Oh. noinstr. I failed to notice the comment. Sorry for the noise.

Wei.