forked from Minki/linux
c0d2af6378
The __used attribute prevents gcc from eliminating unnecessary, otherwise optimized away, metadata for debugging logging messages. Remove the __used attribute. Signed-off-by: Joe Perches <joe@perches.com> Acked-by: Jason Baron <jbaron@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
127 lines
3.5 KiB
C
127 lines
3.5 KiB
C
#ifndef _DYNAMIC_DEBUG_H
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#define _DYNAMIC_DEBUG_H
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/*
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* An instance of this structure is created in a special
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* ELF section at every dynamic debug callsite. At runtime,
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* the special section is treated as an array of these.
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*/
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struct _ddebug {
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/*
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* These fields are used to drive the user interface
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* for selecting and displaying debug callsites.
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*/
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const char *modname;
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const char *function;
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const char *filename;
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const char *format;
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unsigned int lineno:18;
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/*
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* The flags field controls the behaviour at the callsite.
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* The bits here are changed dynamically when the user
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* writes commands to <debugfs>/dynamic_debug/control
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*/
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#define _DPRINTK_FLAGS_NONE 0
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#define _DPRINTK_FLAGS_PRINT (1<<0) /* printk() a message using the format */
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#define _DPRINTK_FLAGS_INCL_MODNAME (1<<1)
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#define _DPRINTK_FLAGS_INCL_FUNCNAME (1<<2)
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#define _DPRINTK_FLAGS_INCL_LINENO (1<<3)
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#define _DPRINTK_FLAGS_INCL_TID (1<<4)
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#if defined DEBUG
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#define _DPRINTK_FLAGS_DEFAULT _DPRINTK_FLAGS_PRINT
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#else
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#define _DPRINTK_FLAGS_DEFAULT 0
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#endif
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unsigned int flags:8;
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} __attribute__((aligned(8)));
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int ddebug_add_module(struct _ddebug *tab, unsigned int n,
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const char *modname);
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#if defined(CONFIG_DYNAMIC_DEBUG)
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extern int ddebug_remove_module(const char *mod_name);
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extern __printf(2, 3)
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int __dynamic_pr_debug(struct _ddebug *descriptor, const char *fmt, ...);
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extern int ddebug_dyndbg_module_param_cb(char *param, char *val,
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const char *modname);
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struct device;
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extern __printf(3, 4)
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int __dynamic_dev_dbg(struct _ddebug *descriptor, const struct device *dev,
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const char *fmt, ...);
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struct net_device;
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extern __printf(3, 4)
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int __dynamic_netdev_dbg(struct _ddebug *descriptor,
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const struct net_device *dev,
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const char *fmt, ...);
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#define DEFINE_DYNAMIC_DEBUG_METADATA(name, fmt) \
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static struct _ddebug __aligned(8) \
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__attribute__((section("__verbose"))) name = { \
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.modname = KBUILD_MODNAME, \
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.function = __func__, \
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.filename = __FILE__, \
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.format = (fmt), \
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.lineno = __LINE__, \
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.flags = _DPRINTK_FLAGS_DEFAULT, \
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}
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#define dynamic_pr_debug(fmt, ...) \
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do { \
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DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, fmt); \
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if (unlikely(descriptor.flags & _DPRINTK_FLAGS_PRINT)) \
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__dynamic_pr_debug(&descriptor, pr_fmt(fmt), \
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##__VA_ARGS__); \
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} while (0)
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#define dynamic_dev_dbg(dev, fmt, ...) \
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do { \
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DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, fmt); \
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if (unlikely(descriptor.flags & _DPRINTK_FLAGS_PRINT)) \
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__dynamic_dev_dbg(&descriptor, dev, fmt, \
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##__VA_ARGS__); \
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} while (0)
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#define dynamic_netdev_dbg(dev, fmt, ...) \
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do { \
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DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, fmt); \
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if (unlikely(descriptor.flags & _DPRINTK_FLAGS_PRINT)) \
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__dynamic_netdev_dbg(&descriptor, dev, fmt, \
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##__VA_ARGS__); \
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} while (0)
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#else
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#include <linux/string.h>
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#include <linux/errno.h>
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static inline int ddebug_remove_module(const char *mod)
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{
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return 0;
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}
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static inline int ddebug_dyndbg_module_param_cb(char *param, char *val,
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const char *modname)
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{
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if (strstr(param, "dyndbg")) {
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/* avoid pr_warn(), which wants pr_fmt() fully defined */
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printk(KERN_WARNING "dyndbg param is supported only in "
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"CONFIG_DYNAMIC_DEBUG builds\n");
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return 0; /* allow and ignore */
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}
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return -EINVAL;
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}
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#define dynamic_pr_debug(fmt, ...) \
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do { if (0) printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__); } while (0)
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#define dynamic_dev_dbg(dev, fmt, ...) \
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do { if (0) dev_printk(KERN_DEBUG, dev, fmt, ##__VA_ARGS__); } while (0)
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#endif
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#endif
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