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https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
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2d75af2f2a
On older gcc (3.3) dynamic debug fails to compile: include/net/inet_connection_sock.h: In function `inet_csk_reset_xmit_timer': include/net/inet_connection_sock.h:236: error: duplicate label declaration `do_printk' include/net/inet_connection_sock.h:219: error: this is a previous declaration include/net/inet_connection_sock.h:236: error: duplicate label declaration `out' include/net/inet_connection_sock.h:219: error: this is a previous declaration include/net/inet_connection_sock.h:236: error: duplicate label `do_printk' include/net/inet_connection_sock.h:236: error: duplicate label `out' Fix, by reverting the usage of JUMP_LABEL() in dynamic debug for now. Cc: <stable@kernel.org> Reported-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> Tested-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> Signed-off-by: Jason Baron <jbaron@redhat.com> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
81 lines
2.4 KiB
C
81 lines
2.4 KiB
C
#ifndef _DYNAMIC_DEBUG_H
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#define _DYNAMIC_DEBUG_H
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#include <linux/jump_label.h>
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/* dynamic_printk_enabled, and dynamic_printk_enabled2 are bitmasks in which
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* bit n is set to 1 if any modname hashes into the bucket n, 0 otherwise. They
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* use independent hash functions, to reduce the chance of false positives.
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*/
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extern long long dynamic_debug_enabled;
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extern long long dynamic_debug_enabled2;
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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:24;
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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_PRINT (1<<0) /* printk() a message using the format */
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#define _DPRINTK_FLAGS_DEFAULT 0
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unsigned int flags:8;
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char enabled;
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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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#define dynamic_pr_debug(fmt, ...) do { \
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static struct _ddebug descriptor \
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__used \
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__attribute__((section("__verbose"), aligned(8))) = \
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{ KBUILD_MODNAME, __func__, __FILE__, fmt, __LINE__, \
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_DPRINTK_FLAGS_DEFAULT }; \
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if (unlikely(descriptor.enabled)) \
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printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__); \
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} while (0)
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#define dynamic_dev_dbg(dev, fmt, ...) do { \
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static struct _ddebug descriptor \
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__used \
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__attribute__((section("__verbose"), aligned(8))) = \
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{ KBUILD_MODNAME, __func__, __FILE__, fmt, __LINE__, \
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_DPRINTK_FLAGS_DEFAULT }; \
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if (unlikely(descriptor.enabled)) \
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dev_printk(KERN_DEBUG, dev, fmt, ##__VA_ARGS__); \
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} while (0)
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#else
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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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#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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