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authorFUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>2008-07-23 21:26:53 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-07-24 10:47:14 -0700
commit8b05c7e6e159d2f33c9275281b8b909a89eb7c5d (patch)
tree646edb14c42d6404e36f1602d47c639c72a8300a /include/linux
parent68ad8df42e12037c3894c9706ab428bf5cd6426b (diff)
downloadlwn-8b05c7e6e159d2f33c9275281b8b909a89eb7c5d.tar.gz
lwn-8b05c7e6e159d2f33c9275281b8b909a89eb7c5d.zip
add a helper function to test if an object is on the stack
lib/debugobjects.c has a function to test if an object is on the stack. The block layer and ide needs it (they need to avoid DMA from/to stack buffers). This patch moves the function to include/linux/sched.h so that everyone can use it. lib/debugobjects.c uses current->stack but this patch uses a task_stack_page() accessor, which is a preferable way to access the stack. Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Cc: Christoph Lameter <cl@linux-foundation.org> Cc: Andy Whitcroft <apw@shadowen.org> Cc: Ingo Molnar <mingo@elte.hu> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux')
-rw-r--r--include/linux/sched.h7
1 files changed, 7 insertions, 0 deletions
diff --git a/include/linux/sched.h b/include/linux/sched.h
index dc7e592c473a..6aca4a16e377 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1983,6 +1983,13 @@ static inline unsigned long *end_of_stack(struct task_struct *p)
#endif
+static inline int object_is_on_stack(void *obj)
+{
+ void *stack = task_stack_page(current);
+
+ return (obj >= stack) && (obj < (stack + THREAD_SIZE));
+}
+
extern void thread_info_cache_init(void);
/* set thread flags in other task's structures