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

[Cihangir Akturk <cakturk@gmail.com>]

On Sun, Aug 20, 2017 at 03:52:26AM +0100, James Simmons wrote:
> 
> > On Aug 17, 2017, at 10:26, Greg KH <gregkh@linuxfoundation.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?

No, I was just compiling the kernel for ARM architecture, and I hit
this issue. If it's possible, I can give it a try with a bunch of
raspberry pis or another cheap board?

>  
> > >> 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@gmail.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?