The patch titled
add a helper function to test if an object is on the stack
has been removed from the -mm tree. Its filename was
add-a-helper-function-to-test-if-an-object-is-on-the-stack.patch
This patch was dropped because it was merged into mainline or a subsystem tree
The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: add a helper function to test if an object is on the stack
From: FUJITA Tomonori <fujita.tomonori@xxxxxxxxxxxxx>
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@xxxxxxxxxxxxx>
Cc: Christoph Lameter <cl@xxxxxxxxxxxxxxxxxxxx>
Cc: Andy Whitcroft <apw@xxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/sched.h | 7 +++++++
lib/debugobjects.c | 4 +---
2 files changed, 8 insertions(+), 3 deletions(-)
diff -puN include/linux/sched.h~add-a-helper-function-to-test-if-an-object-is-on-the-stack include/linux/sched.h
--- a/include/linux/sched.h~add-a-helper-function-to-test-if-an-object-is-on-the-stack
+++ a/include/linux/sched.h
@@ -1973,6 +1973,13 @@ static inline unsigned long *end_of_stac
#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
diff -puN lib/debugobjects.c~add-a-helper-function-to-test-if-an-object-is-on-the-stack lib/debugobjects.c
--- a/lib/debugobjects.c~add-a-helper-function-to-test-if-an-object-is-on-the-stack
+++ a/lib/debugobjects.c
@@ -226,15 +226,13 @@ debug_object_fixup(int (*fixup)(void *ad
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;
_
Patches currently in -mm which might be from fujita.tomonori@xxxxxxxxxxxxx are
origin.patch
linux-next.patch
ide-cd-use-the-new-object_is_in_stack-helper.patch
block-blk-mapc-use-the-new-object_is_on_stack-helper.patch
clean-up-duplicated-alloc-free_thread_info.patch
dma-mapping-add-the-device-argument-to-dma_mapping_error.patch
dma-mapping-add-the-device-argument-to-dma_mapping_error-sge-fix.patch
dma-mapping-add-the-device-argument-to-dma_mapping_error-svc_rdma-fix.patch
dma-mapping-add-the-device-argument-to-dma_mapping_error-bnx2x.patch
dma-mapping-add-the-device-argument-to-dma_mapping_error-s2io.patch
dma-mapping-add-the-device-argument-to-dma_mapping_error-pasemi_mac.patch
dma-mapping-x86-per-device-dma_mapping_ops-support.patch
dma-mapping-x86-per-device-dma_mapping_ops-support-fix.patch
dma-mapping-x86-per-device-dma_mapping_ops-support-fix-2.patch
dma-mapping-add-the-device-argument-to-dma_mapping_error-sdhci-fix.patch
dma-mapping-add-the-device-argument-to-dma_mapping_error-infiniband.patch
dma-mapping-add-the-device-argument-to-dma_mapping_error-more-sparc.patch
dma-mapping-add-the-device-argument-to-dma_mapping_error-ibmvscsi.patch
x86-calgary-fix-handling-of-devices-that-arent-behind-the-calgary.patch
x86-calgary-fix-handling-of-devices-that-arent-behind-the-calgary-checkpatch-fixes.patch
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