linux-kernel - RE: [PATCH v3 3/3] PCI: hv: Introduce hv_msi

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Message-ID: <HK0P153MB0148D7765062717B0AE6B4D3BF1A0@HK0P153MB0148.APCP153.PROD.OUTLOOK.COM>
Date:   Thu, 13 Feb 2020 08:05:12 +0000
From:   Dexuan Cui <decui@...rosoft.com>
To:     Boqun Feng <boqun.feng@...il.com>
CC:     "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        Michael Kelley <mikelley@...rosoft.com>,
        KY Srinivasan <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Sasha Levin <sashal@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        "x86@...nel.org" <x86@...nel.org>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Andrew Murray <andrew.murray@....com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Andrew Murray <amurray@...goodpenguin.co.uk>
Subject: RE: [PATCH v3 3/3] PCI: hv: Introduce hv_msi_entry

> From: Boqun Feng <boqun.feng@...il.com>
> Sent: Wednesday, February 12, 2020 11:14 PM
> 
> On Thu, Feb 13, 2020 at 04:18:01AM +0000, Dexuan Cui wrote:
> > > From: linux-hyperv-owner@...r.kernel.org
> > > <linux-hyperv-owner@...r.kernel.org> On Behalf Of Boqun Feng
> > > diff --git a/arch/x86/include/asm/hyperv-tlfs.h
> > > b/arch/x86/include/asm/hyperv-tlfs.h
> > >
> > > +union hv_msi_entry {
> > > +	u64 as_uint64;
> > > +	struct {
> > > +		u32 address;
> > > +		u32 data;
> > > +	} __packed;
> > > +};
> >
> > Just a small thing: should we move the __packed to after the "}" of
> > the union hv_msi_entry ?
> >
> 
> Actually, in TLFS header, it's common to put the "__packed" inside the
> union, rather than after the union. It makes sense because union is
> different than struct: the alignment requirement of a union is already
> decided by the "as_*" member, so no need for "__packed" attribute.
> 
> Regards,
> Boqun

I see. Thanks for the explanation!

Thanks,
-- Dexuan