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Kirill Smelkov
linux
Commits
2164d334
Commit
2164d334
authored
Jun 23, 2012
by
Cong Wang
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pipe: remove KM_USER0 from comments
Signed-off-by:
Cong Wang
<
amwang@redhat.com
>
parent
a8e5202d
Changes
2
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4 additions
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6 deletions
+4
-6
fs/pipe.c
fs/pipe.c
+1
-1
include/linux/pipe_fs_i.h
include/linux/pipe_fs_i.h
+3
-5
No files found.
fs/pipe.c
View file @
2164d334
...
@@ -224,7 +224,7 @@ static void anon_pipe_buf_release(struct pipe_inode_info *pipe,
...
@@ -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
* and the caller has to be careful not to fault before calling
* the unmap function.
* 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
,
void
*
generic_pipe_buf_map
(
struct
pipe_inode_info
*
pipe
,
struct
pipe_buffer
*
buf
,
int
atomic
)
struct
pipe_buffer
*
buf
,
int
atomic
)
...
...
include/linux/pipe_fs_i.h
View file @
2164d334
...
@@ -86,11 +86,9 @@ struct pipe_buf_operations {
...
@@ -86,11 +86,9 @@ struct pipe_buf_operations {
* mapping or not. The atomic map is faster, however you can't take
* 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
* page faults before calling ->unmap() again. So if you need to eg
* access user data through copy_to/from_user(), then you must get
* access user data through copy_to/from_user(), then you must get
* a non-atomic map. ->map() uses the KM_USER0 atomic slot for
* a non-atomic map. ->map() uses the kmap_atomic slot for
* atomic maps, so you can't map more than one pipe_buffer at once
* atomic maps, you have to be careful if mapping another page as
* and you have to be careful if mapping another page as source
* source or destination for a copy.
* or destination for a copy (IOW, it has to use something else
* than KM_USER0).
*/
*/
void
*
(
*
map
)(
struct
pipe_inode_info
*
,
struct
pipe_buffer
*
,
int
);
void
*
(
*
map
)(
struct
pipe_inode_info
*
,
struct
pipe_buffer
*
,
int
);
...
...
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