filter_irq_stacks() can be used by other tools (e.g. KMSAN), so it needs
to be moved to a common location.
lib/stackdepot.c seems a good place, as filter_irq_stacks() is usually
applied to the output of stack_trace_save().
This patch has been previously mailed as part of KMSAN RFC patch series.
Signed-off-by: Alexander Potapenko <glider@xxxxxxxxxx>
To: Alexander Potapenko <glider@xxxxxxxxxx>
Cc: Vegard Nossum <vegard.nossum@xxxxxxxxxx>
Cc: Dmitry Vyukov <dvyukov@xxxxxxxxxx>
Cc: Marco Elver <elver@xxxxxxxxxx>
Cc: Andrey Konovalov <andreyknvl@xxxxxxxxxx>
Cc: Andrey Ryabinin <aryabinin@xxxxxxxxxxxxx>
Cc: linux-mm@xxxxxxxxx
---
include/linux/stackdepot.h | 2 ++
lib/stackdepot.c | 24 ++++++++++++++++++++++++
mm/kasan/common.c | 23 -----------------------
3 files changed, 26 insertions(+), 23 deletions(-)
diff --git a/include/linux/stackdepot.h b/include/linux/stackdepot.h
index 3efa97d482cbe..24d49c732341a 100644
--- a/include/linux/stackdepot.h
+++ b/include/linux/stackdepot.h
@@ -19,4 +19,6 @@ depot_stack_handle_t stack_depot_save(unsigned long *entries,
unsigned int stack_depot_fetch(depot_stack_handle_t handle,
unsigned long **entries);
+unsigned int filter_irq_stacks(unsigned long *entries, unsigned int nr_entries);
+
#endif
diff --git a/lib/stackdepot.c b/lib/stackdepot.c
index a2f6cb900db80..da5d1880bf343 100644
--- a/lib/stackdepot.c
+++ b/lib/stackdepot.c
@@ -20,6 +20,7 @@
*/
#include <linux/gfp.h>
+#include <linux/interrupt.h>
#include <linux/jhash.h>
#include <linux/kernel.h>
#include <linux/mm.h>
@@ -318,3 +319,26 @@ depot_stack_handle_t stack_depot_save(unsigned long *entries,
return retval;
}
EXPORT_SYMBOL_GPL(stack_depot_save);
+
+static inline int in_irqentry_text(unsigned long ptr)
+{
+ return (ptr >= (unsigned long)&__irqentry_text_start &&
+ ptr < (unsigned long)&__irqentry_text_end) ||
+ (ptr >= (unsigned long)&__softirqentry_text_start &&
+ ptr < (unsigned long)&__softirqentry_text_end);
+}
+
+unsigned int filter_irq_stacks(unsigned long *entries,
+ unsigned int nr_entries)
+{
+ unsigned int i;
+
+ for (i = 0; i < nr_entries; i++) {
+ if (in_irqentry_text(entries[i])) {
+ /* Include the irqentry function into the stack. */
+ return i + 1;
+ }
+ }
+ return nr_entries;
+}
+EXPORT_SYMBOL_GPL(filter_irq_stacks);
diff --git a/mm/kasan/common.c b/mm/kasan/common.c
index 6aa51723b92b9..92815ef9c80d3 100644
--- a/mm/kasan/common.c
+++ b/mm/kasan/common.c
@@ -15,7 +15,6 @@
*/
#include <linux/export.h>
-#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/kasan.h>
#include <linux/kernel.h>
@@ -42,28 +41,6 @@
#include "kasan.h"
#include "../slab.h"
-static inline int in_irqentry_text(unsigned long ptr)
-{
- return (ptr >= (unsigned long)&__irqentry_text_start &&
- ptr < (unsigned long)&__irqentry_text_end) ||
- (ptr >= (unsigned long)&__softirqentry_text_start &&
- ptr < (unsigned long)&__softirqentry_text_end);
-}
-
-static inline unsigned int filter_irq_stacks(unsigned long *entries,
- unsigned int nr_entries)
-{
- unsigned int i;
-
- for (i = 0; i < nr_entries; i++) {
- if (in_irqentry_text(entries[i])) {
- /* Include the irqentry function into the stack. */
- return i + 1;
- }
- }
- return nr_entries;
-}
-
static inline depot_stack_handle_t save_stack(gfp_t flags)
{
unsigned long entries[KASAN_STACK_DEPTH];
--
2.25.0.265.gbab2e86ba0-goog
