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| author | Frederic Weisbecker <fweisbec@gmail.com> | 2009-02-10 16:52:37 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-02-11 11:04:16 +0100 |
| commit | cf2592f59c0e8ed4308adbdb2e0a88655379d579 (patch) | |
| tree | 383b30bc13af8ce83e15825b041d8bb791ea4cea /drivers/acpi/video.c | |
| parent | softlockup: remove timestamp checking from hung_task (diff) | |
| download | linux-cf2592f59c0e8ed4308adbdb2e0a88655379d579.tar.xz linux-cf2592f59c0e8ed4308adbdb2e0a88655379d579.zip | |
softlockup: ensure the task has been switched out once
When we check if a task has been switched out since the last scan, we might
have a race condition on the following scenario:
- the task is freshly created and scheduled
- it puts its state to TASK_UNINTERRUPTIBLE and is not yet switched out
- check_hung_task() scans this task and will report a false positive because
t->nvcsw + t->nivcsw == t->last_switch_count == 0
Add a check for such cases.
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Acked-by: Mandeep Singh Baines <msb@google.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'drivers/acpi/video.c')
0 files changed, 0 insertions, 0 deletions