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| author | David Howells <dhowells@redhat.com> | 2010-01-15 17:01:32 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2010-01-16 12:15:39 -0800 |
| commit | ed5e5894b234ce4793d78078c026915b853e0678 (patch) | |
| tree | 199db2a5cc821d4de9645418fb00c03d438eae1f /ipc/shm.c | |
| parent | 8ff410daa009c4b44be445ded5b0cec00abc0426 (diff) | |
| download | lwn-ed5e5894b234ce4793d78078c026915b853e0678.tar.gz lwn-ed5e5894b234ce4793d78078c026915b853e0678.zip | |
nommu: fix SYSV SHM for NOMMU
Commit c4caa778157dbbf04116f0ac2111e389b5cd7a29 ("file
->get_unmapped_area() shouldn't duplicate work of get_unmapped_area()")
broke SYSV SHM for NOMMU by taking away the pointer to
shm_get_unmapped_area() from shm_file_operations.
Put it back conditionally on CONFIG_MMU=n.
file->f_ops->get_unmapped_area() is used to find out the base address for a
mapping of a mappable chardev device or mappable memory-based file (such as a
ramfs file). It needs to be called prior to file->f_ops->mmap() being called.
Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Al Viro <viro@zeniv.linux.org.uk>
Cc: Greg Ungerer <gerg@snapgear.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'ipc/shm.c')
| -rw-r--r-- | ipc/shm.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/ipc/shm.c b/ipc/shm.c index 92fe9236258b..23256b855819 100644 --- a/ipc/shm.c +++ b/ipc/shm.c @@ -298,6 +298,9 @@ static const struct file_operations shm_file_operations = { .mmap = shm_mmap, .fsync = shm_fsync, .release = shm_release, +#ifndef CONFIG_MMU + .get_unmapped_area = shm_get_unmapped_area, +#endif }; static const struct file_operations shm_file_operations_huge = { |