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Three minor tracing fixes:

Browse source 
- Fix missing prototypes in sample module for direct functions
 
 - Fix check of valid buffer in get_trace_buf()
 
 - Fix annotations of percpu pointers.
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Merge tag 'trace-v5.16-rc8' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace

Pull tracing fixes from Steven Rostedt:
 "Three minor tracing fixes:

   - Fix missing prototypes in sample module for direct functions

   - Fix check of valid buffer in get_trace_buf()

   - Fix annotations of percpu pointers"

* tag 'trace-v5.16-rc8' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace:
  tracing: Tag trace_percpu_buffer as a percpu pointer
  tracing: Fix check for trace_percpu_buffer validity in get_trace_buf()
  ftrace/samples: Add missing prototypes direct functions
This commit is contained in:
Linus Torvalds 2022-01-06 15:00:43 -08:00
commit b2b436ec02
5 changed files with 14 additions and 3 deletions
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6
kernel/trace/trace.c
View file

@ -3207,7 +3207,7 @@ struct trace_buffer_struct {
char buffer[4][TRACE_BUF_SIZE];
};
static struct trace_buffer_struct *trace_percpu_buffer;
static struct trace_buffer_struct __percpu *trace_percpu_buffer;
/*
* This allows for lockless recording. If we're nested too deeply, then
@ -3217,7 +3217,7 @@ static char *get_trace_buf(void)
{
struct trace_buffer_struct *buffer = this_cpu_ptr(trace_percpu_buffer);
if (!buffer || buffer->nesting >= 4)
if (!trace_percpu_buffer || buffer->nesting >= 4)
return NULL;
buffer->nesting++;
@ -3236,7 +3236,7 @@ static void put_trace_buf(void)
static int alloc_percpu_trace_buffer(void)
{
struct trace_buffer_struct *buffers;
struct trace_buffer_struct __percpu *buffers;
if (trace_percpu_buffer)
return 0;

3
samples/ftrace/ftrace-direct-modify.c
View file

@ -4,6 +4,9 @@
#include <linux/ftrace.h>
#include <asm/asm-offsets.h>
extern void my_direct_func1(void);
extern void my_direct_func2(void);
void my_direct_func1(void)
{
trace_printk("my direct func1\n");

3
samples/ftrace/ftrace-direct-multi-modify.c
View file

@ -4,6 +4,9 @@
#include <linux/ftrace.h>
#include <asm/asm-offsets.h>
extern void my_direct_func1(unsigned long ip);
extern void my_direct_func2(unsigned long ip);
void my_direct_func1(unsigned long ip)
{
trace_printk("my direct func1 ip %lx\n", ip);

3
samples/ftrace/ftrace-direct-too.c
View file

@ -5,6 +5,9 @@
#include <linux/ftrace.h>
#include <asm/asm-offsets.h>
extern void my_direct_func(struct vm_area_struct *vma,
unsigned long address, unsigned int flags);
void my_direct_func(struct vm_area_struct *vma,
unsigned long address, unsigned int flags)
{

2
samples/ftrace/ftrace-direct.c
View file

@ -5,6 +5,8 @@
#include <linux/ftrace.h>
#include <asm/asm-offsets.h>
extern void my_direct_func(struct task_struct *p);
void my_direct_func(struct task_struct *p)
{
trace_printk("waking up %s-%d\n", p->comm, p->pid);