diff options
| author | Andy Lutomirski <[email protected]> | 2016-08-30 08:04:15 -0700 |
|---|---|---|
| committer | Ingo Molnar <[email protected]> | 2016-09-08 08:48:35 +0200 |
| commit | 9472fe7040bba45c6200858cbe40d643cf02bccb (patch) | |
| tree | 42fbdc86d2feb50ff5c288c4ef32dc9cfa977e94 /tools/perf/util/scripting-engines/trace-event-python.c | |
| parent | 6271cfdfc0e4731b76921ef02fdd87409d71dfdf (diff) | |
virtio_console: Stop doing DMA on the stack
virtio_console uses a small DMA buffer for control requests. Move
that buffer into heap memory.
Doing virtio DMA on the stack is normally okay on non-DMA-API virtio
systems (which is currently most of them), but it breaks completely
if the stack is virtually mapped (CONFIG_VMAP_STACK=y).
Tested by typing both directions using picocom aimed at /dev/hvc0.
Signed-off-by: Andy Lutomirski <[email protected]>
Reviewed-by: Amit Shah <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Michael S. Tsirkin <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: [email protected]
Link: http://lkml.kernel.org/r/0afe68f9b4be6c95af9e7672b07acd0274c26dfe.1472569320.git.luto@kernel.org
Signed-off-by: Ingo Molnar <[email protected]>
Diffstat (limited to 'tools/perf/util/scripting-engines/trace-event-python.c')
0 files changed, 0 insertions, 0 deletions