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| author | Dan Williams <[email protected]> | 2015-11-13 02:33:54 +0000 |
|---|---|---|
| committer | Dan Williams <[email protected]> | 2015-11-13 02:33:54 +0000 |
| commit | 152d7bd80dca5ce77ec2d7313149a2ab990e808e (patch) | |
| tree | 0278dcde82a608216233147c2adf58fa0911b7b0 /drivers/fpga/fpga-mgr.c | |
| parent | libnvdimm: documentation clarifications (diff) | |
| download | kernel-152d7bd80dca5ce77ec2d7313149a2ab990e808e.tar.gz kernel-152d7bd80dca5ce77ec2d7313149a2ab990e808e.zip | |
dax: fix __dax_pmd_fault crash
Since 4.3 introduced devm_memremap_pages() the pfns handled by DAX may
optionally have a struct page backing. When a mapped pfn reaches
vmf_insert_pfn_pmd() it fails with a crash signature like the following:
kernel BUG at mm/huge_memory.c:905!
[..]
Call Trace:
[<ffffffff812a73ba>] __dax_pmd_fault+0x2ea/0x5b0
[<ffffffffa01a4182>] xfs_filemap_pmd_fault+0x92/0x150 [xfs]
[<ffffffff811fbe02>] handle_mm_fault+0x312/0x1b50
Fix this by falling back to 4K mappings in the pfn_valid() case. Longer
term, vmf_insert_pfn_pmd() needs to grow support for architectures that
can provide a 'pmd_special' capability.
Cc: <[email protected]>
Cc: Andrew Morton <[email protected]>
Reported-by: Ross Zwisler <[email protected]>
Signed-off-by: Dan Williams <[email protected]>
Diffstat (limited to 'drivers/fpga/fpga-mgr.c')
0 files changed, 0 insertions, 0 deletions