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-rw-r--r--include/asm-generic/bug.h17
1 files changed, 17 insertions, 0 deletions
diff --git a/include/asm-generic/bug.h b/include/asm-generic/bug.h
index 8af276361bf2..37b82cb96c89 100644
--- a/include/asm-generic/bug.h
+++ b/include/asm-generic/bug.h
@@ -28,6 +28,17 @@ struct bug_entry {
#define BUGFLAG_WARNING (1<<0)
#endif /* CONFIG_GENERIC_BUG */
+/*
+ * Don't use BUG() or BUG_ON() unless there's really no way out; one
+ * example might be detecting data structure corruption in the middle
+ * of an operation that can't be backed out of. If the (sub)system
+ * can somehow continue operating, perhaps with reduced functionality,
+ * it's probably not BUG-worthy.
+ *
+ * If you're tempted to BUG(), think again: is completely giving up
+ * really the *only* solution? There are usually better options, where
+ * users don't need to reboot ASAP and can mostly shut down cleanly.
+ */
#ifndef HAVE_ARCH_BUG
#define BUG() do { \
printk("BUG: failure at %s:%d/%s()!\n", __FILE__, __LINE__, __func__); \
@@ -39,6 +50,12 @@ struct bug_entry {
#define BUG_ON(condition) do { if (unlikely(condition)) BUG(); } while(0)
#endif
+/*
+ * WARN(), WARN_ON(), WARN_ON_ONCE, and so on can be used to report
+ * significant issues that need prompt attention if they should ever
+ * appear at runtime. Use the versions with printk format strings
+ * to provide better diagnostics.
+ */
#ifndef __WARN
#ifndef __ASSEMBLY__
extern void warn_slowpath(const char *file, const int line,