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2214f707de
The patch fixes two problems: 1. Working with task->mm w/o getting mm or grabing the task lock is dangerous as ->mm might disappear (exit_mm() assigns NULL under task_lock(), so tasklist lock is not enough). We can't use get_task_mm()/mmput() pair as mmput() might sleep, so we have to take the task lock while handle its mm. 2. Checking for process->mm is not enough because process' main thread may exit or detach its mm via use_mm(), but other threads may still have a valid mm. To catch this we use find_lock_task_mm(), which walks up all threads and returns an appropriate task (with task lock held). Suggested-by: Oleg Nesterov <oleg@redhat.com> Signed-off-by: Anton Vorontsov <anton.vorontsov@linaro.org> Cc: Mike Frysinger <vapier@gentoo.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> |
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| .. | ||
| boot | ||
| configs | ||
| include | ||
| kernel | ||
| lib | ||
| mach-bf518 | ||
| mach-bf527 | ||
| mach-bf533 | ||
| mach-bf537 | ||
| mach-bf538 | ||
| mach-bf548 | ||
| mach-bf561 | ||
| mach-bf609 | ||
| mach-common | ||
| mm | ||
| oprofile | ||
| Clear_BSD.txt | ||
| Kconfig | ||
| Kconfig.debug | ||
| Makefile | ||