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| author | Andrew G. Harvey <agh@cisco.com> | 2008-09-23 19:10:02 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2008-10-16 12:24:54 -0400 |
| commit | 02683ffdf655b4ae15245376ba6fea6d9e5829a6 (patch) | |
| tree | 9b66a97df10db3d09be94e90b90f1e3b6eaa4934 /Documentation/kernel-parameters.txt | |
| parent | a6030fcc608bd333c80eab3bfc72f63906476c61 (diff) | |
UIO: Fix mapping of logical and virtual memory
mmap() doesn't work as expected for UIO_MEM_LOGICAL or UIO_MEM_VIRTUAL
mappings. The offset into the memory needs to be added, otherwise
uio_vma_fault always returns the first page only. Note that for UIO
userspace calls mmap() with offset = N * getpagesize() to access
mapping N. This must be compensated when calculating the offset. A
comment was added to explain this since it is not obvious.
Signed-off-by: Andrew G. Harvey <agh@cisco.com>
Signed-off-by: Hans J. Koch <hjk@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'Documentation/kernel-parameters.txt')
0 files changed, 0 insertions, 0 deletions