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[PATCH] NOMMU: Make SYSV IPC SHM use ramfs facilities on NOMMU

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The attached patch makes the SYSV IPC shared memory facilities use the new
ramfs facilities on a no-MMU kernel.

The following changes are made:

 (1) There are now shmem_mmap() and shmem_get_unmapped_area() functions to
     allow the IPC SHM facilities to commune with the tiny-shmem and shmem
     code.

 (2) ramfs files now need resizing using do_truncate() rather than by modifying
     the inode size directly (see shmem_file_setup()). This causes ramfs to
     attempt to bind a block of pages of sufficient size to the inode.

 (3) CONFIG_SYSVIPC is no longer contingent on CONFIG_MMU.

Signed-off-by: David Howells <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
David Howells 2006-01-06 00:11:42 -08:00 • committed by Linus Torvalds
commit b0e15190ea
6 changed files with 58 additions and 8 deletions
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2
mm/shmem.c
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@ -1270,7 +1270,7 @@ out_nomem:
return retval;
}
static int shmem_mmap(struct file *file, struct vm_area_struct *vma)
int shmem_mmap(struct file *file, struct vm_area_struct *vma)
{
file_accessed(file);
vma->vm_ops = &shmem_vm_ops;