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ftrace: nmi safe code clean ups

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Impact: cleanup

This patch cleans up the NMI safe code for dynamic ftrace as suggested
by Andrew Morton.

Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Steven Rostedt 2008-10-31 00:03:22 -04:00 committed by Ingo Molnar
parent b807c3d0f8
commit a26a2a2739
8 changed files with 28 additions and 26 deletions
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4
arch/arm/include/asm/ftrace.h
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@ -2,8 +2,8 @@
#define _ASM_ARM_FTRACE
#ifndef __ASSEMBLY__
#define ftrace_nmi_enter() do { } while (0)
#define ftrace_nmi_exit() do { } while (0)
static inline void ftrace_nmi_enter(void) { }
static inline void ftrace_nmi_exit(void) { }
#endif
#ifdef CONFIG_FUNCTION_TRACER

4
arch/powerpc/include/asm/ftrace.h
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@ -2,8 +2,8 @@
#define _ASM_POWERPC_FTRACE
#ifndef __ASSEMBLY__
#define ftrace_nmi_enter() do { } while (0)
#define ftrace_nmi_exit() do { } while (0)
static inline void ftrace_nmi_enter(void) { }
static inline void ftrace_nmi_exit(void) { }
#endif
#ifdef CONFIG_FUNCTION_TRACER

4
arch/sh/include/asm/ftrace.h
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@ -2,8 +2,8 @@
#define __ASM_SH_FTRACE_H
#ifndef __ASSEMBLY__
#define ftrace_nmi_enter() do { } while (0)
#define ftrace_nmi_exit() do { } while (0)
static inline void ftrace_nmi_enter(void) { }
static inline void ftrace_nmi_exit(void) { }
#endif
#ifndef __ASSEMBLY__

4
arch/sparc/include/asm/ftrace.h
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@ -2,8 +2,8 @@
#define _ASM_SPARC64_FTRACE
#ifndef __ASSEMBLY__
#define ftrace_nmi_enter() do { } while (0)
#define ftrace_nmi_exit() do { } while (0)
static inline void ftrace_nmi_enter(void) { }
static inline void ftrace_nmi_exit(void) { }
#endif
#ifdef CONFIG_MCOUNT

10
arch/x86/include/asm/ftrace.h
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@ -22,16 +22,16 @@ static inline unsigned long ftrace_call_adjust(unsigned long addr)
extern void ftrace_nmi_enter(void);
extern void ftrace_nmi_exit(void);
#else
#define ftrace_nmi_enter() do { } while (0)
#define ftrace_nmi_exit() do { } while (0)
#endif
static inline void ftrace_nmi_enter(void) { }
static inline void ftrace_nmi_exit(void) { }
#endif
#endif /* __ASSEMBLY__ */
#else /* CONFIG_FUNCTION_TRACER */
#ifndef __ASSEMBLY__
#define ftrace_nmi_enter() do { } while (0)
#define ftrace_nmi_exit() do { } while (0)
static inline void ftrace_nmi_enter(void) { }
static inline void ftrace_nmi_exit(void) { }
#endif
#endif /* CONFIG_FUNCTION_TRACER */

16
arch/x86/kernel/ftrace.c
View File

@ -67,7 +67,7 @@ unsigned char *ftrace_call_replace(unsigned long ip, unsigned long addr)
*
* Two buffers are added: An IP buffer and a "code" buffer.
*
* 1) Put in the instruction pointer into the IP buffer
* 1) Put the instruction pointer into the IP buffer
* and the new code into the "code" buffer.
* 2) Set a flag that says we are modifying code
* 3) Wait for any running NMIs to finish.
@ -85,14 +85,14 @@ unsigned char *ftrace_call_replace(unsigned long ip, unsigned long addr)
* are the same as what exists.
*/
static atomic_t in_nmi;
static int mod_code_status;
static int mod_code_write;
static void *mod_code_ip;
static void *mod_code_newcode;
static atomic_t in_nmi = ATOMIC_INIT(0);
static int mod_code_status; /* holds return value of text write */
static int mod_code_write; /* set when NMI should do the write */
static void *mod_code_ip; /* holds the IP to write to */
static void *mod_code_newcode; /* holds the text to write to the IP */
static int nmi_wait_count;
static atomic_t nmi_update_count;
static unsigned nmi_wait_count;
static atomic_t nmi_update_count = ATOMIC_INIT(0);
int ftrace_arch_read_dyn_info(char *buf, int size)
{

3
include/linux/ftrace.h
View File

@ -74,6 +74,9 @@ extern void ftrace_caller(void);
extern void ftrace_call(void);
extern void mcount_call(void);
/* May be defined in arch */
extern int ftrace_arch_read_dyn_info(char *buf, int size);
/**
* ftrace_modify_code - modify code segment
* @ip: the address of the code segment

9
kernel/trace/trace.c
View File

@ -2815,10 +2815,6 @@ static struct file_operations tracing_mark_fops = {
#ifdef CONFIG_DYNAMIC_FTRACE
#define DYN_INFO_BUF_SIZE 1023
static char ftrace_dyn_info_buffer[DYN_INFO_BUF_SIZE+1];
static DEFINE_MUTEX(dyn_info_mutex);
int __weak ftrace_arch_read_dyn_info(char *buf, int size)
{
return 0;
@ -2828,14 +2824,17 @@ static ssize_t
tracing_read_dyn_info(struct file *filp, char __user *ubuf,
size_t cnt, loff_t *ppos)
{
static char ftrace_dyn_info_buffer[1024];
static DEFINE_MUTEX(dyn_info_mutex);
unsigned long *p = filp->private_data;
char *buf = ftrace_dyn_info_buffer;
int size = ARRAY_SIZE(ftrace_dyn_info_buffer);
int r;
mutex_lock(&dyn_info_mutex);
r = sprintf(buf, "%ld ", *p);
r += ftrace_arch_read_dyn_info(buf+r, DYN_INFO_BUF_SIZE-r);
r += ftrace_arch_read_dyn_info(buf+r, (size-1)-r);
buf[r++] = '\n';
r = simple_read_from_buffer(ubuf, cnt, ppos, buf, r);