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Re: [qemu-s390x] [PATCH] pc-bios/s390-ccw: struct tpi_info must be decla
From: |
Cornelia Huck |
Subject: |
Re: [qemu-s390x] [PATCH] pc-bios/s390-ccw: struct tpi_info must be declared as aligned(4) |
Date: |
Tue, 8 May 2018 14:20:48 +0200 |
On Tue, 8 May 2018 12:17:52 +0200
Thomas Huth <address@hidden> wrote:
> I've run into a compilation error today with the current version of GCC 8:
>
> In file included from s390-ccw.h:49,
> from main.c:12:
> cio.h:128:1: error: alignment 1 of 'struct tpi_info' is less than 4
> [-Werror=packed-not-aligned]
> } __attribute__ ((packed));
> ^
> cc1: all warnings being treated as errors
>
> Since the struct tpi_info contains an element ("struct subchannel_id schid")
> which is marked as aligned(4), we've got to mark the struct tpi_info as
> aligned(4), too.
>
> Signed-off-by: Thomas Huth <address@hidden>
> ---
> pc-bios/s390-ccw/cio.h | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/pc-bios/s390-ccw/cio.h b/pc-bios/s390-ccw/cio.h
> index 55eaeee..1a0795f 100644
> --- a/pc-bios/s390-ccw/cio.h
> +++ b/pc-bios/s390-ccw/cio.h
> @@ -125,7 +125,7 @@ struct tpi_info {
> __u32 reserved3 : 12;
> __u32 int_type : 3;
> __u32 reserved4 : 12;
> -} __attribute__ ((packed));
> +} __attribute__ ((packed, aligned(4)));
>
> /* channel command word (type 1) */
> struct ccw1 {
Thanks, queued to s390-next with a cc:stable.