Add WARN_ONCE definition to allow single time notification of warnings to the user. Taken from Linux kernel (4.17) with slight changes (Removed __section(.data.once))

Signed-off-by: Ramon Fried ramon.fried@gmail.com --- v2: removed change-id, added taken from description to commit message.

include/linux/bug.h | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+)

diff --git a/include/linux/bug.h b/include/linux/bug.h index f07bb716fc..67b6057a22 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); \ + 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 */