From: "Yaroslav Brustinov (ybrustin)" <ybrustin@cisco.com>
To: Shahaf Shuler <shahafs@mellanox.com>,
Adrien Mazarguil <adrien.mazarguil@6wind.com>
Cc: "Yongseok Koh" <yskoh@mellanox.com>,
"dev@dpdk.org" <dev@dpdk.org>,
"stable@dpdk.org" <stable@dpdk.org>,
"Nélio Laranjeiro" <nelio.laranjeiro@6wind.com>
Subject: Re: [dpdk-stable] [PATCH] net/mlx5: fix linkage error for glue lib
Date: Tue, 24 Jul 2018 14:24:12 +0000 [thread overview]
Message-ID: <f2667f4c0d0f4272bef96e9d0d766e28@XCH-ALN-002.cisco.com> (raw)
In-Reply-To: <DB7PR05MB4426199AE87257E29F482EFAC3550@DB7PR05MB4426.eurprd05.prod.outlook.com>
Hi,
Are you OK with C11?
I saw in file dpdk/drivers/net/mlx4/mlx4_utils.c:
* C11 code would include stdalign.h and use alignof(max_align_t) however
* we'll stick with C99 for the time being.
:)
As far as I understand, the issue is alignment of the pointer itself, not the struct.
I'm not familiar with this command: "alignof(max_align_t)".
Applying this on the struct:
struct mlx5_glue {
...
} __attribute__((__aligned__(64)));
struct __attribute__((__aligned__(64))) mlx5_glue {
...
};
...still keeps the linker unhappy.
Thanks,
Yaroslav.
-----Original Message-----
From: Shahaf Shuler [mailto:shahafs@mellanox.com]
Sent: Tuesday, July 24, 2018 16:51
To: Adrien Mazarguil <adrien.mazarguil@6wind.com>
Cc: Yongseok Koh <yskoh@mellanox.com>; dev@dpdk.org; Yaroslav Brustinov (ybrustin) <ybrustin@cisco.com>; stable@dpdk.org; Nélio Laranjeiro <nelio.laranjeiro@6wind.com>
Subject: RE: [PATCH] net/mlx5: fix linkage error for glue lib
Yaroslav,
Tuesday, July 24, 2018 3:06 PM, Adrien Mazarguil:
> Subject: Re: [PATCH] net/mlx5: fix linkage error for glue lib
> > Odd, how could this happen assuming both files are compiled during
> > the same run using identical flags? Looks like a compiler issue.
> >
> > Anyway, may I suggest an alignment constraint on the structure type
> > in mlx5_glue.h instead, so that all users inherit it. E.g. using C11 syntax:
> >
> > #include <stdalign.h>
> > #include <stddef.h>
> >
> > [...]
> > alignas(max_align_t)
> > struct mlx5_glue {
> > [...]
> > };
>
> My bad, this is not a correct use for alignas(), it doesn't work on types.
> How about this instead:
>
> alignas(max_align_t)
> const struct mlx5_glue *mlx5_glue;
Can you confirm the above suggestion fixes your issue?
>
> >
next prev parent reply other threads:[~2018-07-24 14:24 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-07-24 8:54 Shahaf Shuler
2018-07-24 12:00 ` Adrien Mazarguil
2018-07-24 12:05 ` Adrien Mazarguil
2018-07-24 13:51 ` Shahaf Shuler
2018-07-24 14:24 ` Yaroslav Brustinov (ybrustin) [this message]
2018-07-24 16:03 ` Adrien Mazarguil
2018-07-25 7:38 ` Yaroslav Brustinov (ybrustin)
2018-07-25 9:24 ` Adrien Mazarguil
2018-07-25 10:02 ` Yaroslav Brustinov (ybrustin)
2018-07-25 13:18 ` [dpdk-stable] [PATCH v2] " Shahaf Shuler
2018-07-25 13:22 ` Adrien Mazarguil
2018-07-26 5:44 ` Shahaf Shuler
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