linux-kernel - RE: [PATCH v3] hyperv: simplify and rename generate_guest

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Date:   Tue, 27 Sep 2022 04:54:30 +0000
From:   "Michael Kelley (LINUX)" <mikelley@...rosoft.com>
To:     Olaf Hering <olaf@...fle.de>
CC:     Li kunyu <kunyu@...china.com>, KY Srinivasan <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        "wei.liu@...nel.org" <wei.liu@...nel.org>,
        Dexuan Cui <decui@...rosoft.com>,
        "catalin.marinas@....com" <catalin.marinas@....com>,
        "will@...nel.org" <will@...nel.org>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "bp@...en8.de" <bp@...en8.de>,
        "dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>,
        "hpa@...or.com" <hpa@...or.com>, "arnd@...db.de" <arnd@...db.de>,
        "x86@...nel.org" <x86@...nel.org>,
        "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>
Subject: RE: [PATCH v3] hyperv: simplify and rename generate_guest_id

From: Olaf Hering <olaf@...fle.de> Sent: Monday, September 26, 2022 12:57 AM
> 
> Sat, 24 Sep 2022 05:31:34 +0000 "Michael Kelley (LINUX)" <mikelley@...rosoft.com>:
> 
> > From: Olaf Hering <olaf@...fle.de> Sent: Friday, September 23, 2022 2:09 PM
> 
> > > A very long time ago I removed most usage of version.h AFAIR,
> > Could you elaborate?
> 
> It is the cost of 'make LOCALVERSION=x' vs. 'make LOCALVERSION=y'.
> 
> Too many drivers will be recompiled for no good reason as of today.
> I claim no consumer below drivers/ and sound/ has a valid usecase for version.h.
> But, someone else has to take the energy and argue them out of the tree.
> 
> With the proposed change every consumer of asm-generic/mshyperv.h will be dirty,
> see 'touch include/asm-generic/mshyperv.h' for the impact. Therefore I think
> only the two existing c files should include this header, in case the provided
> information has a true value for the consumer.
> 

Thanks, Olaf.  That makes sense and I agree.

Li Kunyu -- that means you should "undo" part of your patch.  Keep the use
of LINUX_VERSION_CODE and the #include of <linux/version.h> in the two
.c files, and pass LINUX_VERSION_CODE as an argument to hv_generate_guest_id().
Remove the #include of <linux/version.h> from include/asm-generic/mshyperv.h.

Michael