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Date: Thu, 18 Apr 2019 10:41:35 +0200
From: Thomas Gleixner <tglx@...utronix.de>
To: LKML <linux-kernel@...r.kernel.org>
Cc: Josh Poimboeuf <jpoimboe@...hat.com>, x86@...nel.org,
Andy Lutomirski <luto@...nel.org>,
Steven Rostedt <rostedt@...dmis.org>,
Alexander Potapenko <glider@...gle.com>,
intel-gfx@...ts.freedesktop.org,
Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
dri-devel@...ts.freedesktop.org, David Airlie <airlied@...ux.ie>,
Jani Nikula <jani.nikula@...ux.intel.com>,
Daniel Vetter <daniel@...ll.ch>,
Rodrigo Vivi <rodrigo.vivi@...el.com>,
Alexey Dobriyan <adobriyan@...il.com>,
Andrew Morton <akpm@...ux-foundation.org>,
Pekka Enberg <penberg@...nel.org>, linux-mm@...ck.org,
David Rientjes <rientjes@...gle.com>,
Christoph Lameter <cl@...ux.com>,
Catalin Marinas <catalin.marinas@....com>,
Dmitry Vyukov <dvyukov@...gle.com>,
Andrey Ryabinin <aryabinin@...tuozzo.com>,
kasan-dev@...glegroups.com,
Mike Rapoport <rppt@...ux.vnet.ibm.com>,
Akinobu Mita <akinobu.mita@...il.com>,
iommu@...ts.linux-foundation.org,
Robin Murphy <robin.murphy@....com>,
Christoph Hellwig <hch@....de>,
Marek Szyprowski <m.szyprowski@...sung.com>,
Johannes Thumshirn <jthumshirn@...e.de>,
David Sterba <dsterba@...e.com>, Chris Mason <clm@...com>,
Josef Bacik <josef@...icpanda.com>,
linux-btrfs@...r.kernel.org, dm-devel@...hat.com,
Mike Snitzer <snitzer@...hat.com>,
Alasdair Kergon <agk@...hat.com>, linux-arch@...r.kernel.org
Subject: [patch V2 16/29] drm: Simplify stacktrace handling
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 <tglx@...utronix.de>
Cc: intel-gfx@...ts.freedesktop.org
Cc: Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>
Cc: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>
Cc: dri-devel@...ts.freedesktop.org
Cc: David Airlie <airlied@...ux.ie>
Cc: Jani Nikula <jani.nikula@...ux.intel.com>
Cc: Daniel Vetter <daniel@...ll.ch>
Cc: Rodrigo Vivi <rodrigo.vivi@...el.com>
---
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)
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