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authorPaul Jackson <pj@sgi.com>2006-03-31 02:30:50 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-03-31 12:18:55 -0800
commit4a01c8d5be628ac20cfd432c21808d76be5813e6 (patch)
tree040ae0d60df3993a752ce852d3e3dc036586b037 /kernel/cpuset.c
parent2cf8d82d63807c2c68adf20bb28bf502496186dd (diff)
[PATCH] cpuset: task_lock comment fix
Fix cpuset comment involving case of a tasks cpuset pointer being NULL. Thanks to "the_top_cpuset_hack", this code no longer sees NULL task->cpuset pointers. Signed-off-by: Paul Jackson <pj@sgi.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'kernel/cpuset.c')
-rw-r--r--kernel/cpuset.c10
1 files changed, 4 insertions, 6 deletions
diff --git a/kernel/cpuset.c b/kernel/cpuset.c
index 18aea1bd1284..2523a4b6a8c6 100644
--- a/kernel/cpuset.c
+++ b/kernel/cpuset.c
@@ -616,12 +616,10 @@ static void guarantee_online_mems(const struct cpuset *cs, nodemask_t *pmask)
* current->cpuset if a task has its memory placement changed.
* Do not call this routine if in_interrupt().
*
- * Call without callback_mutex or task_lock() held. May be called
- * with or without manage_mutex held. Doesn't need task_lock to guard
- * against another task changing a non-NULL cpuset pointer to NULL,
- * as that is only done by a task on itself, and if the current task
- * is here, it is not simultaneously in the exit code NULL'ing its
- * cpuset pointer. This routine also might acquire callback_mutex and
+ * Call without callback_mutex or task_lock() held. May be
+ * called with or without manage_mutex held. Thanks in part to
+ * 'the_top_cpuset_hack', the tasks cpuset pointer will never
+ * be NULL. This routine also might acquire callback_mutex and
* current->mm->mmap_sem during call.
*
* Reading current->cpuset->mems_generation doesn't need task_lock

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