[U-Boot] [PATCH] bug.h: introduce WARN_ONCE

[Masahiro Yamada]

2018-05-28 18:44 GMT+09:00 Ramon Fried <ramon.fried at linaro.org>:
> Add WARN_ONCE definition to allow single time notification
> of warnings to the user.
>
> Signed-off-by: Ramon Fried <ramon.fried at gmail.com>
> ---
>  include/linux/bug.h | 18 ++++++++++++++++++
>  1 file changed, 18 insertions(+)
>
> diff --git a/include/linux/bug.h b/include/linux/bug.h
> index f07bb716fc0..67b6057a22a 100644
> --- a/include/linux/bug.h
> +++ b/include/linux/bug.h
> @@ -20,6 +20,13 @@
>         unlikely(__ret_warn_on);                                        \
>  })
>
> +#define WARN(condition, format...) ({                   \
> +       int __ret_warn_on = !!(condition);              \
> +       if (unlikely(__ret_warn_on))                    \
> +               __WARN_printf(format);                  \


Where is __WARN_printf() defined?




> +       unlikely(__ret_warn_on);                    \
> +})
> +
>  #define WARN_ON_ONCE(condition)        ({                              \
>         static bool __warned;                                   \
>         int __ret_warn_once = !!(condition);                    \
> @@ -31,4 +38,15 @@
>         unlikely(__ret_warn_once);                              \
>  })
>
> +#define WARN_ONCE(condition, format...) ({          \
> +       static bool __warned;     \
> +       int __ret_warn_once = !!(condition);            \
> +                                                               \
> +       if (unlikely(__ret_warn_once && !__warned)) {       \
> +               __warned = true;                \
> +               WARN(1, format);                \
> +       }                           \
> +       unlikely(__ret_warn_once);              \
> +})
> +
>  #endif /* _LINUX_BUG_H */
> --
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> a Linux Foundation Collaborative Project
>
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-- 
Best Regards
Masahiro Yamada