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0dd7a8b948
[ Upstream commit dbefa1f31a91670c9e7dac9b559625336206466f ] Commitb1fca27d38("kernel debug: support resetting WARN*_ONCE") added support for clearing the state of once warnings. However, it is not functional when CONFIG_LD_DEAD_CODE_DATA_ELIMINATION or CONFIG_LTO_CLANG is enabled, because .data.once matches the .data.[0-9a-zA-Z_]* pattern in the DATA_MAIN macro. Commitcb87481ee8("kbuild: linker script do not match C names unless LD_DEAD_CODE_DATA_ELIMINATION is configured") was introduced to suppress the issue for the default CONFIG_LD_DEAD_CODE_DATA_ELIMINATION=n case, providing a minimal fix for stable backporting. We were aware this did not address the issue for CONFIG_LD_DEAD_CODE_DATA_ELIMINATION=y. The plan was to apply correct fixes and then revertcb87481ee8. [1] Seven years have passed since then, yet the #ifdef workaround remains in place. Meanwhile, commitb1fca27d38introduced the .data.once section, and commitdc5723b02e("kbuild: add support for Clang LTO") extended the #ifdef. Using a ".." separator in the section name fixes the issue for CONFIG_LD_DEAD_CODE_DATA_ELIMINATION and CONFIG_LTO_CLANG. [1]: https://lore.kernel.org/linux-kbuild/CAK7LNASck6BfdLnESxXUeECYL26yUDm0cwRZuM4gmaWUkxjL5g@mail.gmail.com/ Fixes:b1fca27d38("kernel debug: support resetting WARN*_ONCE") Fixes:dc5723b02e("kbuild: add support for Clang LTO") Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org>
158 lines
5.1 KiB
C
158 lines
5.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_NET_DEBUG_H
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#define _LINUX_NET_DEBUG_H
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#include <linux/bug.h>
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#include <linux/kern_levels.h>
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struct net_device;
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__printf(3, 4) __cold
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void netdev_printk(const char *level, const struct net_device *dev,
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const char *format, ...);
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__printf(2, 3) __cold
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void netdev_emerg(const struct net_device *dev, const char *format, ...);
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__printf(2, 3) __cold
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void netdev_alert(const struct net_device *dev, const char *format, ...);
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__printf(2, 3) __cold
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void netdev_crit(const struct net_device *dev, const char *format, ...);
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__printf(2, 3) __cold
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void netdev_err(const struct net_device *dev, const char *format, ...);
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__printf(2, 3) __cold
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void netdev_warn(const struct net_device *dev, const char *format, ...);
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__printf(2, 3) __cold
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void netdev_notice(const struct net_device *dev, const char *format, ...);
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__printf(2, 3) __cold
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void netdev_info(const struct net_device *dev, const char *format, ...);
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#define netdev_level_once(level, dev, fmt, ...) \
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do { \
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static bool __section(".data..once") __print_once; \
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\
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if (!__print_once) { \
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__print_once = true; \
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netdev_printk(level, dev, fmt, ##__VA_ARGS__); \
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} \
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} while (0)
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#define netdev_emerg_once(dev, fmt, ...) \
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netdev_level_once(KERN_EMERG, dev, fmt, ##__VA_ARGS__)
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#define netdev_alert_once(dev, fmt, ...) \
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netdev_level_once(KERN_ALERT, dev, fmt, ##__VA_ARGS__)
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#define netdev_crit_once(dev, fmt, ...) \
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netdev_level_once(KERN_CRIT, dev, fmt, ##__VA_ARGS__)
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#define netdev_err_once(dev, fmt, ...) \
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netdev_level_once(KERN_ERR, dev, fmt, ##__VA_ARGS__)
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#define netdev_warn_once(dev, fmt, ...) \
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netdev_level_once(KERN_WARNING, dev, fmt, ##__VA_ARGS__)
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#define netdev_notice_once(dev, fmt, ...) \
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netdev_level_once(KERN_NOTICE, dev, fmt, ##__VA_ARGS__)
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#define netdev_info_once(dev, fmt, ...) \
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netdev_level_once(KERN_INFO, dev, fmt, ##__VA_ARGS__)
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#if defined(CONFIG_DYNAMIC_DEBUG) || \
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(defined(CONFIG_DYNAMIC_DEBUG_CORE) && defined(DYNAMIC_DEBUG_MODULE))
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#define netdev_dbg(__dev, format, args...) \
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do { \
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dynamic_netdev_dbg(__dev, format, ##args); \
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} while (0)
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#elif defined(DEBUG)
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#define netdev_dbg(__dev, format, args...) \
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netdev_printk(KERN_DEBUG, __dev, format, ##args)
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#else
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#define netdev_dbg(__dev, format, args...) \
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({ \
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if (0) \
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netdev_printk(KERN_DEBUG, __dev, format, ##args); \
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})
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#endif
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#if defined(VERBOSE_DEBUG)
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#define netdev_vdbg netdev_dbg
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#else
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#define netdev_vdbg(dev, format, args...) \
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({ \
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if (0) \
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netdev_printk(KERN_DEBUG, dev, format, ##args); \
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0; \
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})
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#endif
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/* netif printk helpers, similar to netdev_printk */
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#define netif_printk(priv, type, level, dev, fmt, args...) \
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do { \
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if (netif_msg_##type(priv)) \
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netdev_printk(level, (dev), fmt, ##args); \
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} while (0)
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#define netif_level(level, priv, type, dev, fmt, args...) \
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do { \
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if (netif_msg_##type(priv)) \
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netdev_##level(dev, fmt, ##args); \
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} while (0)
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#define netif_emerg(priv, type, dev, fmt, args...) \
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netif_level(emerg, priv, type, dev, fmt, ##args)
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#define netif_alert(priv, type, dev, fmt, args...) \
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netif_level(alert, priv, type, dev, fmt, ##args)
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#define netif_crit(priv, type, dev, fmt, args...) \
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netif_level(crit, priv, type, dev, fmt, ##args)
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#define netif_err(priv, type, dev, fmt, args...) \
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netif_level(err, priv, type, dev, fmt, ##args)
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#define netif_warn(priv, type, dev, fmt, args...) \
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netif_level(warn, priv, type, dev, fmt, ##args)
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#define netif_notice(priv, type, dev, fmt, args...) \
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netif_level(notice, priv, type, dev, fmt, ##args)
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#define netif_info(priv, type, dev, fmt, args...) \
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netif_level(info, priv, type, dev, fmt, ##args)
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#if defined(CONFIG_DYNAMIC_DEBUG) || \
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(defined(CONFIG_DYNAMIC_DEBUG_CORE) && defined(DYNAMIC_DEBUG_MODULE))
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#define netif_dbg(priv, type, netdev, format, args...) \
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do { \
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if (netif_msg_##type(priv)) \
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dynamic_netdev_dbg(netdev, format, ##args); \
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} while (0)
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#elif defined(DEBUG)
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#define netif_dbg(priv, type, dev, format, args...) \
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netif_printk(priv, type, KERN_DEBUG, dev, format, ##args)
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#else
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#define netif_dbg(priv, type, dev, format, args...) \
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({ \
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if (0) \
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netif_printk(priv, type, KERN_DEBUG, dev, format, ##args); \
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0; \
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})
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#endif
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/* if @cond then downgrade to debug, else print at @level */
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#define netif_cond_dbg(priv, type, netdev, cond, level, fmt, args...) \
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do { \
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if (cond) \
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netif_dbg(priv, type, netdev, fmt, ##args); \
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else \
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netif_ ## level(priv, type, netdev, fmt, ##args); \
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} while (0)
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#if defined(VERBOSE_DEBUG)
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#define netif_vdbg netif_dbg
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#else
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#define netif_vdbg(priv, type, dev, format, args...) \
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({ \
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if (0) \
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netif_printk(priv, type, KERN_DEBUG, dev, format, ##args); \
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0; \
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})
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#endif
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#if defined(CONFIG_DEBUG_NET)
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#define DEBUG_NET_WARN_ON_ONCE(cond) (void)WARN_ON_ONCE(cond)
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#else
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#define DEBUG_NET_WARN_ON_ONCE(cond) BUILD_BUG_ON_INVALID(cond)
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#endif
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#endif /* _LINUX_NET_DEBUG_H */
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