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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 /lib
parent68ad8df42e12037c3894c9706ab428bf5cd6426b (diff)
downloadconfigs-8b05c7e6e159d2f33c9275281b8b909a89eb7c5d.tar.gz
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 'lib')
-rw-r--r--lib/debugobjects.c4
1 files changed, 1 insertions, 3 deletions
diff --git a/lib/debugobjects.c b/lib/debugobjects.c
index 85b18d79be8..f86196390cf 100644
--- a/lib/debugobjects.c
+++ b/lib/debugobjects.c
@@ -226,15 +226,13 @@ debug_object_fixup(int (*fixup)(void *addr, enum debug_obj_state state),
static void debug_object_is_on_stack(void *addr, int onstack)
{
- void *stack = current->stack;
int is_on_stack;
static int limit;
if (limit > 4)
return;
- is_on_stack = (addr >= stack && addr < (stack + THREAD_SIZE));
-
+ is_on_stack = object_is_on_stack(addr);
if (is_on_stack == onstack)
return;