linux-kernel - RE: [PATCH] clocksource/drivers/hyper-v: Include asm/hyperv-tlfs.h not asm/mshyperv.h

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Message-ID: <87cz9mo6ey.ffs@tglx>
Date:   Wed, 16 Nov 2022 23:56:05 +0100
From:   Thomas Gleixner <tglx@...utronix.de>
To:     "Michael Kelley (LINUX)" <mikelley@...rosoft.com>,
        LKML <linux-kernel@...r.kernel.org>
Cc:     "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Wei Liu <wei.liu@...nel.org>, Dexuan Cui <decui@...rosoft.com>,
        Andy Lutomirski <luto@...nel.org>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>
Subject: RE: [PATCH] clocksource/drivers/hyper-v: Include asm/hyperv-tlfs.h
 not asm/mshyperv.h

On Wed, Nov 16 2022 at 22:34, Michael Kelley wrote:
> From: Thomas Gleixner <tglx@...utronix.de> Sent: Wednesday, November 16, 2022 12:52 PM
>> On Sun, Nov 13 2022 at 22:21, Thomas Gleixner wrote:
>> > Subject: clocksource/drivers/hyper-v: Include asm/hyperv-tlfs.h not
>> asm/mshyperv.h
>> > From: Thomas Gleixner <tglx@...utronix.de>
>> > Date: Sat, 12 Nov 2022 19:08:15 +0100
>> >
>> > clocksource/hyperv_timer.h is included into the VDSO build. It includes
>> > asm/mshyperv.h which in turn includes the world and some more. This worked
>> > so far by chance, but any subtle change in the include chain results in a
>> > build breakage because VDSO builds are building user space libraries.
>> >
>> > Include asm/hyperv-tlfs.h instead which contains everything what the VDSO
>> > build needs and move the hv_get_raw_timer() define into the header file.
>> >
>> > Fixup drivers/hv/vmbus_drv.c which relies on the indirect include of
>> > asm/mshyperv.h.
>> 
>> Any comments on this latest version?
>
> Sorry.  This looks good to me.  Maybe the commit message needs a
> bit of tweaking -- it's not clear what "move hv_get_raw_timer()
> define into the header file" exactly refers to.  But otherwise,

That should obviously be 'into a separate header file, which is included
from clocksource/hyperv_timer.h' or something like that.

Thanks,

        tglx