Replace the indirection through struct stack_trace by using the storage
array based interfaces.
The original code in all printing functions is really wrong. It allocates a
storage array on stack which is unused because depot_fetch_stack() does not
store anything in it. It overwrites the entries pointer in the stack_trace
struct so it points to the depot storage.
Signed-off-by: Thomas Gleixner <[email protected]>
Cc: [email protected]
Cc: Joonas Lahtinen <[email protected]>
Cc: Maarten Lankhorst <[email protected]>
Cc: [email protected]
Cc: David Airlie <[email protected]>
Cc: Jani Nikula <[email protected]>
Cc: Daniel Vetter <[email protected]>
Cc: Rodrigo Vivi <[email protected]>
---
drivers/gpu/drm/drm_mm.c | 22 +++++++---------------
drivers/gpu/drm/i915/i915_vma.c | 11 ++++-------
drivers/gpu/drm/i915/intel_runtime_pm.c | 21 +++++++--------------
3 files changed, 18 insertions(+), 36 deletions(-)
--- a/drivers/gpu/drm/drm_mm.c
+++ b/drivers/gpu/drm/drm_mm.c
@@ -106,22 +106,19 @@
static noinline void save_stack(struct drm_mm_node *node)
{
unsigned long entries[STACKDEPTH];
- struct stack_trace trace = {
- .entries = entries,
- .max_entries = STACKDEPTH,
- .skip = 1
- };
+ unsigned int n;
- save_stack_trace(&trace);
+ n = stack_trace_save(entries, ARRAY_SIZE(entries), 1);
/* May be called under spinlock, so avoid sleeping */
- node->stack = depot_save_stack(&trace, GFP_NOWAIT);
+ node->stack = stack_depot_save(entries, n, GFP_NOWAIT);
}
static void show_leaks(struct drm_mm *mm)
{
struct drm_mm_node *node;
- unsigned long entries[STACKDEPTH];
+ unsigned long *entries;
+ unsigned int nr_entries;
char *buf;
buf = kmalloc(BUFSZ, GFP_KERNEL);
@@ -129,19 +126,14 @@ static void show_leaks(struct drm_mm *mm
return;
list_for_each_entry(node, drm_mm_nodes(mm), node_list) {
- struct stack_trace trace = {
- .entries = entries,
- .max_entries = STACKDEPTH
- };
-
if (!node->stack) {
DRM_ERROR("node [%08llx + %08llx]: unknown owner\n",
node->start, node->size);
continue;
}
- depot_fetch_stack(node->stack, &trace);
- snprint_stack_trace(buf, BUFSZ, &trace, 0);
+ nr_entries = stack_depot_fetch(node->stack, &entries);
+ stack_trace_snprint(buf, BUFSZ, entries, nr_entries, 0);
DRM_ERROR("node [%08llx + %08llx]: inserted at\n%s",
node->start, node->size, buf);
}
--- a/drivers/gpu/drm/i915/i915_vma.c
+++ b/drivers/gpu/drm/i915/i915_vma.c
@@ -36,11 +36,8 @@
static void vma_print_allocator(struct i915_vma *vma, const char *reason)
{
- unsigned long entries[12];
- struct stack_trace trace = {
- .entries = entries,
- .max_entries = ARRAY_SIZE(entries),
- };
+ unsigned long *entries;
+ unsigned int nr_entries;
char buf[512];
if (!vma->node.stack) {
@@ -49,8 +46,8 @@ static void vma_print_allocator(struct i
return;
}
- depot_fetch_stack(vma->node.stack, &trace);
- snprint_stack_trace(buf, sizeof(buf), &trace, 0);
+ nr_entries = stack_depot_fetch(vma->node.stack, &entries);
+ stack_trace_snprint(buf, sizeof(buf), entries, nr_entries, 0);
DRM_DEBUG_DRIVER("vma.node [%08llx + %08llx] %s: inserted at %s\n",
vma->node.start, vma->node.size, reason, buf);
}
--- a/drivers/gpu/drm/i915/intel_runtime_pm.c
+++ b/drivers/gpu/drm/i915/intel_runtime_pm.c
@@ -60,27 +60,20 @@
static noinline depot_stack_handle_t __save_depot_stack(void)
{
unsigned long entries[STACKDEPTH];
- struct stack_trace trace = {
- .entries = entries,
- .max_entries = ARRAY_SIZE(entries),
- .skip = 1,
- };
+ unsigned int n;
- save_stack_trace(&trace);
- return depot_save_stack(&trace, GFP_NOWAIT | __GFP_NOWARN);
+ n = stack_trace_save(entries, ARRAY_SIZE(entries), 1);
+ return stack_depot_save(entries, n, GFP_NOWAIT | __GFP_NOWARN);
}
static void __print_depot_stack(depot_stack_handle_t stack,
char *buf, int sz, int indent)
{
- unsigned long entries[STACKDEPTH];
- struct stack_trace trace = {
- .entries = entries,
- .max_entries = ARRAY_SIZE(entries),
- };
+ unsigned long *entries;
+ unsigned int nr_entries;
- depot_fetch_stack(stack, &trace);
- snprint_stack_trace(buf, sz, &trace, indent);
+ nr_entries = stack_depot_fetch(stack, &entries);
+ stack_trace_snprint(buf, sz, entries, nr_entries, indent);
}
static void init_intel_runtime_pm_wakeref(struct drm_i915_private *i915)
On Thu, Apr 18, 2019 at 10:41:35AM +0200, Thomas Gleixner wrote:
> Replace the indirection through struct stack_trace by using the storage
> array based interfaces.
>
> The original code in all printing functions is really wrong. It allocates a
> storage array on stack which is unused because depot_fetch_stack() does not
> store anything in it. It overwrites the entries pointer in the stack_trace
> struct so it points to the depot storage.
Thanks for cleaning this up for us!
> Signed-off-by: Thomas Gleixner <[email protected]>
> Cc: [email protected]
> Cc: Joonas Lahtinen <[email protected]>
> Cc: Maarten Lankhorst <[email protected]>
> Cc: [email protected]
> Cc: David Airlie <[email protected]>
> Cc: Jani Nikula <[email protected]>
> Cc: Daniel Vetter <[email protected]>
> Cc: Rodrigo Vivi <[email protected]>
Acked-by: Daniel Vetter <[email protected]>
for merging through whatever tree is convenient for you (or tell me I
should pick it up into drm-next when the prep work landed).
Cheers, Daniel
> ---
> drivers/gpu/drm/drm_mm.c | 22 +++++++---------------
> drivers/gpu/drm/i915/i915_vma.c | 11 ++++-------
> drivers/gpu/drm/i915/intel_runtime_pm.c | 21 +++++++--------------
> 3 files changed, 18 insertions(+), 36 deletions(-)
>
> --- a/drivers/gpu/drm/drm_mm.c
> +++ b/drivers/gpu/drm/drm_mm.c
> @@ -106,22 +106,19 @@
> static noinline void save_stack(struct drm_mm_node *node)
> {
> unsigned long entries[STACKDEPTH];
> - struct stack_trace trace = {
> - .entries = entries,
> - .max_entries = STACKDEPTH,
> - .skip = 1
> - };
> + unsigned int n;
>
> - save_stack_trace(&trace);
> + n = stack_trace_save(entries, ARRAY_SIZE(entries), 1);
>
> /* May be called under spinlock, so avoid sleeping */
> - node->stack = depot_save_stack(&trace, GFP_NOWAIT);
> + node->stack = stack_depot_save(entries, n, GFP_NOWAIT);
> }
>
> static void show_leaks(struct drm_mm *mm)
> {
> struct drm_mm_node *node;
> - unsigned long entries[STACKDEPTH];
> + unsigned long *entries;
> + unsigned int nr_entries;
> char *buf;
>
> buf = kmalloc(BUFSZ, GFP_KERNEL);
> @@ -129,19 +126,14 @@ static void show_leaks(struct drm_mm *mm
> return;
>
> list_for_each_entry(node, drm_mm_nodes(mm), node_list) {
> - struct stack_trace trace = {
> - .entries = entries,
> - .max_entries = STACKDEPTH
> - };
> -
> if (!node->stack) {
> DRM_ERROR("node [%08llx + %08llx]: unknown owner\n",
> node->start, node->size);
> continue;
> }
>
> - depot_fetch_stack(node->stack, &trace);
> - snprint_stack_trace(buf, BUFSZ, &trace, 0);
> + nr_entries = stack_depot_fetch(node->stack, &entries);
> + stack_trace_snprint(buf, BUFSZ, entries, nr_entries, 0);
> DRM_ERROR("node [%08llx + %08llx]: inserted at\n%s",
> node->start, node->size, buf);
> }
> --- a/drivers/gpu/drm/i915/i915_vma.c
> +++ b/drivers/gpu/drm/i915/i915_vma.c
> @@ -36,11 +36,8 @@
>
> static void vma_print_allocator(struct i915_vma *vma, const char *reason)
> {
> - unsigned long entries[12];
> - struct stack_trace trace = {
> - .entries = entries,
> - .max_entries = ARRAY_SIZE(entries),
> - };
> + unsigned long *entries;
> + unsigned int nr_entries;
> char buf[512];
>
> if (!vma->node.stack) {
> @@ -49,8 +46,8 @@ static void vma_print_allocator(struct i
> return;
> }
>
> - depot_fetch_stack(vma->node.stack, &trace);
> - snprint_stack_trace(buf, sizeof(buf), &trace, 0);
> + nr_entries = stack_depot_fetch(vma->node.stack, &entries);
> + stack_trace_snprint(buf, sizeof(buf), entries, nr_entries, 0);
> DRM_DEBUG_DRIVER("vma.node [%08llx + %08llx] %s: inserted at %s\n",
> vma->node.start, vma->node.size, reason, buf);
> }
> --- a/drivers/gpu/drm/i915/intel_runtime_pm.c
> +++ b/drivers/gpu/drm/i915/intel_runtime_pm.c
> @@ -60,27 +60,20 @@
> static noinline depot_stack_handle_t __save_depot_stack(void)
> {
> unsigned long entries[STACKDEPTH];
> - struct stack_trace trace = {
> - .entries = entries,
> - .max_entries = ARRAY_SIZE(entries),
> - .skip = 1,
> - };
> + unsigned int n;
>
> - save_stack_trace(&trace);
> - return depot_save_stack(&trace, GFP_NOWAIT | __GFP_NOWARN);
> + n = stack_trace_save(entries, ARRAY_SIZE(entries), 1);
> + return stack_depot_save(entries, n, GFP_NOWAIT | __GFP_NOWARN);
> }
>
> static void __print_depot_stack(depot_stack_handle_t stack,
> char *buf, int sz, int indent)
> {
> - unsigned long entries[STACKDEPTH];
> - struct stack_trace trace = {
> - .entries = entries,
> - .max_entries = ARRAY_SIZE(entries),
> - };
> + unsigned long *entries;
> + unsigned int nr_entries;
>
> - depot_fetch_stack(stack, &trace);
> - snprint_stack_trace(buf, sz, &trace, indent);
> + nr_entries = stack_depot_fetch(stack, &entries);
> + stack_trace_snprint(buf, sz, entries, nr_entries, indent);
> }
>
> static void init_intel_runtime_pm_wakeref(struct drm_i915_private *i915)
>
>
--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch