linux-kernel - Re: [PATCH] staging: lustre: fix structure size for ARM OABI

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Date:   Sun, 20 Aug 2017 03:52:26 +0100 (BST)
From:   James Simmons <jsimmons@...radead.org>
To:     "Dilger, Andreas" <andreas.dilger@...el.com>
cc:     Greg KH <gregkh@...uxfoundation.org>,
        Cihangir Akturk <cakturk@...il.com>,
        Lustre Development List <lustre-devel@...ts.lustre.org>,
        "devel@...verdev.osuosl.org" <devel@...verdev.osuosl.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "Drokin, Oleg" <oleg.drokin@...el.com>
Subject: Re: [PATCH] staging: lustre: fix structure size for ARM OABI


> On Aug 17, 2017, at 10:26, Greg KH <gregkh@...uxfoundation.org> wrote:
> > 
> > On Wed, Aug 16, 2017 at 05:44:15PM +0300, Cihangir Akturk wrote:
> >> When building the kernel for the ARM architecture without setting
> >> CONFIG_AEABI, size of struct lov_user_md_v3 and struct lov_mds_md_v3
> >> differs, due to different alignment requirements of OABI and EABI.

I have to ask are you testing the lustre on ARM?
 
> >> Marking the anonymous union within struct lov_user_md_v3 as
> >> '_packed' solves this issue. Otherwise we get the following
> >> error:
> >> 
> >> drivers/staging/lustre/lustre/lov/lov_pack.c:352:2: note: in expansion
> >> of macro ‘BUILD_BUG_ON’
> >>  BUILD_BUG_ON(sizeof(lum) != sizeof(struct lov_mds_md_v3));
> >> 
> >> Signed-off-by: Cihangir Akturk <cakturk@...il.com>
> >> ---
> >> drivers/staging/lustre/lustre/include/lustre/lustre_user.h | 2 +-
> >> 1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > This file is no longer in the tree :(
> 
> With James' recent patch series, this has moved to include/uapi/linux/lustre/lustre_user.h

BTW is __packed valid for UAPI headers?