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Message-Id: <20190418084255.275696472@linutronix.de>
Date: Thu, 18 Apr 2019 10:41:43 +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>,
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>,
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>,
linux-arch@...r.kernel.org
Subject: [patch V2 24/29] tracing: Remove the last struct stack_trace usage
Simplify the stack retrieval code by using the storage array based
interface.
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
kernel/trace/trace_stack.c | 42 ++++++++++++++++--------------------------
1 file changed, 16 insertions(+), 26 deletions(-)
--- a/kernel/trace/trace_stack.c
+++ b/kernel/trace/trace_stack.c
@@ -23,16 +23,7 @@
static unsigned long stack_dump_trace[STACK_TRACE_ENTRIES];
static unsigned stack_trace_index[STACK_TRACE_ENTRIES];
-/*
- * Reserve one entry for the passed in ip. This will allow
- * us to remove most or all of the stack size overhead
- * added by the stack tracer itself.
- */
-struct stack_trace stack_trace_max = {
- .max_entries = STACK_TRACE_ENTRIES - 1,
- .entries = &stack_dump_trace[0],
-};
-
+static unsigned int stack_trace_entries;
static unsigned long stack_trace_max_size;
static arch_spinlock_t stack_trace_max_lock =
(arch_spinlock_t)__ARCH_SPIN_LOCK_UNLOCKED;
@@ -49,10 +40,10 @@ static void print_max_stack(void)
pr_emerg(" Depth Size Location (%d entries)\n"
" ----- ---- --------\n",
- stack_trace_max.nr_entries);
+ stack_trace_entries);
- for (i = 0; i < stack_trace_max.nr_entries; i++) {
- if (i + 1 == stack_trace_max.nr_entries)
+ for (i = 0; i < stack_trace_entries; i++) {
+ if (i + 1 == stack_trace_entries)
size = stack_trace_index[i];
else
size = stack_trace_index[i] - stack_trace_index[i+1];
@@ -98,13 +89,12 @@ static void check_stack(unsigned long ip
stack_trace_max_size = this_size;
- stack_trace_max.nr_entries = 0;
- stack_trace_max.skip = 0;
-
- save_stack_trace(&stack_trace_max);
+ stack_trace_entries = stack_trace_save(stack_dump_trace,
+ ARRAY_SIZE(stack_dump_trace) - 1,
+ 0);
/* Skip over the overhead of the stack tracer itself */
- for (i = 0; i < stack_trace_max.nr_entries; i++) {
+ for (i = 0; i < stack_trace_entries; i++) {
if (stack_dump_trace[i] == ip)
break;
}
@@ -113,7 +103,7 @@ static void check_stack(unsigned long ip
* Some archs may not have the passed in ip in the dump.
* If that happens, we need to show everything.
*/
- if (i == stack_trace_max.nr_entries)
+ if (i == stack_trace_entries)
i = 0;
/*
@@ -131,13 +121,13 @@ static void check_stack(unsigned long ip
* loop will only happen once. This code only takes place
* on a new max, so it is far from a fast path.
*/
- while (i < stack_trace_max.nr_entries) {
+ while (i < stack_trace_entries) {
int found = 0;
stack_trace_index[x] = this_size;
p = start;
- for (; p < top && i < stack_trace_max.nr_entries; p++) {
+ for (; p < top && i < stack_trace_entries; p++) {
/*
* The READ_ONCE_NOCHECK is used to let KASAN know that
* this is not a stack-out-of-bounds error.
@@ -168,7 +158,7 @@ static void check_stack(unsigned long ip
i++;
}
- stack_trace_max.nr_entries = x;
+ stack_trace_entries = x;
if (task_stack_end_corrupted(current)) {
print_max_stack();
@@ -270,7 +260,7 @@ static void *
{
long n = *pos - 1;
- if (n >= stack_trace_max.nr_entries)
+ if (n >= stack_trace_entries)
return NULL;
m->private = (void *)n;
@@ -334,7 +324,7 @@ static int t_show(struct seq_file *m, vo
seq_printf(m, " Depth Size Location"
" (%d entries)\n"
" ----- ---- --------\n",
- stack_trace_max.nr_entries);
+ stack_trace_entries);
if (!stack_tracer_enabled && !stack_trace_max_size)
print_disabled(m);
@@ -344,10 +334,10 @@ static int t_show(struct seq_file *m, vo
i = *(long *)v;
- if (i >= stack_trace_max.nr_entries)
+ if (i >= stack_trace_entries)
return 0;
- if (i + 1 == stack_trace_max.nr_entries)
+ if (i + 1 == stack_trace_entries)
size = stack_trace_index[i];
else
size = stack_trace_index[i] - stack_trace_index[i+1];
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