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

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Date:   Sun, 13 Nov 2022 10:50:14 +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 Sat, Nov 12 2022 at 21:55, Michael Kelley wrote:
> But I can see the problem with too much getting dragged into the VDSO
> builds.  If hv_get_raw_timer() is added to hyperv_timer.h, it should
> be under #ifdef CONFIG_X86.  Adding an #ifdef isn't ideal, and a more
> more proper solution might be to have a separate hyperv_timer.h include
> file under arch/x86/include/asm.  But the latter seems like overkill for just
> hv_get_raw_timer(), so I'm OK with the #ifdef.

We surely can have asm/hyperv_timer.h but TBH:

>>  static inline notrace u64
>>  hv_read_tsc_page_tsc(const struct ms_hyperv_tsc_page *tsc_pg, u64 *cur_tsc)
>>  {

hv_read_tsc_page_tsc() does not look architecture agnostic either. TSC
is pretty x86 specific :)

Thanks,

        tglx