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pipe: remove KM_USER0 from comments 

Signed-off-by: Cong Wang <amwang@redhat.com>
This commit is contained in:
Cong Wang 2012-06-23 11:33:51 +08:00
parent a8e5202d09
commit 2164d33446
2 changed files with 4 additions and 6 deletions
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2
fs/pipe.c
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@ -224,7 +224,7 @@ static void anon_pipe_buf_release(struct pipe_inode_info *pipe,
* and the caller has to be careful not to fault before calling
* the unmap function.
*
* Note that this function occupies KM_USER0 if @atomic != 0.
* Note that this function calls kmap_atomic() if @atomic != 0.
*/
void *generic_pipe_buf_map(struct pipe_inode_info *pipe,
struct pipe_buffer *buf, int atomic)

8
include/linux/pipe_fs_i.h
View File

@ -86,11 +86,9 @@ struct pipe_buf_operations {
* mapping or not. The atomic map is faster, however you can't take
* page faults before calling ->unmap() again. So if you need to eg
* access user data through copy_to/from_user(), then you must get
* a non-atomic map. ->map() uses the KM_USER0 atomic slot for
* atomic maps, so you can't map more than one pipe_buffer at once
* and you have to be careful if mapping another page as source
* or destination for a copy (IOW, it has to use something else
* than KM_USER0).
* a non-atomic map. ->map() uses the kmap_atomic slot for
* atomic maps, you have to be careful if mapping another page as
* source or destination for a copy.
*/
void * (*map)(struct pipe_inode_info *, struct pipe_buffer *, int);