On 2025-09-30, Marcos Paulo de Souza <[email protected]> wrote: > diff --git a/include/linux/kdb.h b/include/linux/kdb.h > index > ecbf819deeca118f27e98bf71bb37dd27a257ebb..36b46c85733fe1df28cde7760e5c26e96de40c05 > 100644 > --- a/include/linux/kdb.h > +++ b/include/linux/kdb.h > @@ -207,11 +207,26 @@ static inline const char *kdb_walk_kallsyms(loff_t *pos) > /* Dynamic kdb shell command registration */ > extern int kdb_register(kdbtab_t *cmd); > extern void kdb_unregister(kdbtab_t *cmd); > + > +/* Return true when KDB as locked for printing a message on this CPU. */ > +static inline > +bool kdb_printf_on_this_cpu(void) > +{ > + /* > + * We can use raw_smp_processor_id() here because the task could > + * not get migrated when KDB has locked for printing on this CPU. > + */ > + return unlikely(READ_ONCE(kdb_printf_cpu) == raw_smp_processor_id()); > +} > + > #else /* ! CONFIG_KGDB_KDB */ > static inline __printf(1, 2) int kdb_printf(const char *fmt, ...) { return > 0; } > static inline void kdb_init(int level) {} > static inline int kdb_register(kdbtab_t *cmd) { return 0; } > static inline void kdb_unregister(kdbtab_t *cmd) {} > + > +static inline bool kdb_printf_on_this_cpu(void) { return false }; > + > #endif /* CONFIG_KGDB_KDB */ > enum { > KDB_NOT_INITIALIZED,
The include for raw_smp_processor_id() is also needed: diff --git a/include/linux/kdb.h b/include/linux/kdb.h index 36b46c85733fe..db9d73b12a1af 100644 --- a/include/linux/kdb.h +++ b/include/linux/kdb.h @@ -14,6 +14,7 @@ */ #include <linux/list.h> +#include <linux/smp.h> /* Shifted versions of the command enable bits are be used if the command * has no arguments (see kdb_check_flags). This allows commands, such as _______________________________________________ Kgdb-bugreport mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/kgdb-bugreport
