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Re: fs/xfs/xfs_ondisk.h:96:2: error: call to '__compiletime_assert_96' declared with attribute error: XFS: sizeof(xfs_dir2_sf_entry_t) is wrong, expected 3

From Christoph Hellwig <hch@infradead.org>
Newsgroups linux.kernel
Subject Re: fs/xfs/xfs_ondisk.h:96:2: error: call to '__compiletime_assert_96' declared with attribute error: XFS: sizeof(xfs_dir2_sf_entry_t) is wrong, expected 3
Date 2016-10-16 18:50 +0200
Message-ID <ssWNj-8ii-3@gated-at.bofh.it> (permalink)
References <ssQ5c-40D-15@gated-at.bofh.it>
Organization linux.* mail to news gateway

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> head:   1001354ca34179f3db924eb66672442a173147dc

That's Linux 4.9-rc1

> 30cbc591 Darrick J. Wong 2016-03-09 @86  	XFS_CHECK_STRUCT_SIZE(xfs_dir2_data_unused_t,		6);

But that's not how xfs_ondisk.h in 4.9-rc1 looks like

> 30cbc591 Darrick J. Wong 2016-03-09 @96  	XFS_CHECK_STRUCT_SIZE(xfs_dir2_sf_entry_t,		3);

And that's line 119.

Something is odd about this report. 

But both xfs_dir2_data_unused_t and xfs_dir2_sf_entry_t have one thing in
common: they are strutures that aren't padded to a natural alignment at
the end.  It seems like the openrisc gcc does implicit padding for them,
which sounds like a nightmware waiting to happen for any sort of disk
or network structure, so I'm really not sure if we should work around
it in xfs.

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Re: fs/xfs/xfs_ondisk.h:96:2: error: call to  '__compiletime_assert_96' declared with attribute error: XFS:  sizeof(xfs_dir2_sf_entry_t) is wrong, expected 3 Christoph Hellwig <hch@infradead.org> - 2016-10-16 18:50 +0200
  Re: [kbuild-all] fs/xfs/xfs_ondisk.h:96:2: error: call to  '__compiletime_assert_96' declared with attribute error: XFS:  sizeof(xfs_dir2_sf_entry_t) is wrong, expected 3 Fengguang Wu <fengguang.wu@intel.com> - 2016-10-17 16:40 +0200

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