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author | Jason Gunthorpe <jgg@mellanox.com> | 2018-06-29 11:31:50 -0600 |
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committer | Alex Williamson <alex.williamson@redhat.com> | 2018-06-30 13:58:09 -0600 |
commit | bb94b55af3461e26b32f0e23d455abeae0cfca5d (patch) | |
tree | 452551a00278b41d599598e1e80eed6b2e7c365b /samples | |
parent | 7733e05b34f5d855c5590d816b41ddfee972d188 (diff) | |
download | linux-bb94b55af3461e26b32f0e23d455abeae0cfca5d.tar.gz linux-bb94b55af3461e26b32f0e23d455abeae0cfca5d.tar.bz2 linux-bb94b55af3461e26b32f0e23d455abeae0cfca5d.zip |
vfio: Use get_user_pages_longterm correctly
The patch noted in the fixes below converted get_user_pages_fast() to
get_user_pages_longterm(), however the two calls differ in a few ways.
First _fast() is documented to not require the mmap_sem, while _longterm()
is documented to need it. Hold the mmap sem as required.
Second, _fast accepts an 'int write' while _longterm uses 'unsigned int
gup_flags', so the expression '!!(prot & IOMMU_WRITE)' is only working by
luck as FOLL_WRITE is currently == 0x1. Use the expected FOLL_WRITE
constant instead.
Fixes: 94db151dc892 ("vfio: disable filesystem-dax page pinning")
Cc: <stable@vger.kernel.org>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Acked-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Diffstat (limited to 'samples')
0 files changed, 0 insertions, 0 deletions