A-Team_Digital_Solutions/android_kernel_motorola_sm6375
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nommu: fix SYSV SHM for NOMMU

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Commit c4caa77815 ("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 <[email protected]>
Acked-by: Al Viro <[email protected]>
Cc: Greg Ungerer <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
David Howells 2010-01-15 17:01:32 -08:00 • committed by Linus Torvalds
commit ed5e5894b2
1 changed files with 3 additions and 0 deletions
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3
ipc/shm.c
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@ -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 = {