linux-kernel - RE: [PATCH v2] x86/hyper-v: Mark TLFS structures packed

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Message-ID: <CY4PR21MB0773D5DFA13BFA0701771F5ED7AE0@CY4PR21MB0773.namprd21.prod.outlook.com>
Date:   Mon, 3 Dec 2018 01:41:50 +0000
From:   Michael Kelley <mikelley@...rosoft.com>
To:     vkuznets <vkuznets@...hat.com>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>
CC:     Paolo Bonzini <pbonzini@...hat.com>,
        Radim Krčmář <rkrcmar@...hat.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Roman Kagan <rkagan@...tuozzo.com>,
        KY Srinivasan <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        "x86@...nel.org" <x86@...nel.org>,
        Nadav Amit <nadav.amit@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: RE: [PATCH v2] x86/hyper-v: Mark TLFS structures packed

From: Vitaly Kuznetsov <vkuznets@...hat.com>  Sent: Friday, November 30, 2018 4:54 AM
> 
> @@ -466,7 +466,7 @@ union hv_message_flags {
>  	struct {
>  		__u8 msg_pending:1;
>  		__u8 reserved:7;
> -	};
> +	} __packed;
>  };
> 
>  /* Define port identifier type. */

I think __packed is also needed in the definition
of struct u defined within union hv_port_id.  That
struct has bit fields, so shouldn't it be done just like
union hv_message_flags above?

Michael

> @@ -488,7 +488,7 @@ struct hv_message_header {
>  		__u64 sender;
>  		union hv_port_id port;
>  	};
> -};
> +} __packed;
>