[PATCH v2 3/4] tracing/remotes: Add REMOTE_EVENT_CUSTOM_PRINTK() helper
From: Vincent Donnefort <hidden>
Date: 2026-07-08 07:57:49
Also in:
kvmarm, linux-arm-kernel
Subsystem:
the rest, tracing · Maintainers:
Linus Torvalds, Steven Rostedt, Masami Hiramatsu
The current REMOTE_EVENT() takes as a __printk argument a string format
and a list of arguments, such as RE_STRUCT("foo=%d bar=%d", foo, bar).
Add a REMOTE_EVENT_CUSTOM_PRINTK() where the __printk argument can be a
function. This intends to support the creation of a "printk" event for
the arm64 nVHE/pKVM hypervisor with a dynamic prototype and by extension
a dynamic print format.
Reviewed-by: Fuad Tabba <redacted>
Tested-by: Fuad Tabba <redacted>
Signed-off-by: Vincent Donnefort <redacted>
diff --git a/include/trace/define_remote_events.h b/include/trace/define_remote_events.h
index 676e803dc144..4f4d58e37b84 100644
--- a/include/trace/define_remote_events.h
+++ b/include/trace/define_remote_events.h@@ -35,17 +35,26 @@ do { \ #define RE_PRINTK(__args...) __args -#define REMOTE_EVENT(__name, __id, __struct, __printk) \ - REMOTE_EVENT_FORMAT(__name, __struct); \ +#define REMOTE_EVENT_PRINT_FUNC(__name, __printk) \ static void remote_event_print_##__name(void *evt, struct trace_seq *seq) \ { \ struct remote_event_format_##__name __maybe_unused *__entry = evt; \ trace_seq_puts(seq, #__name); \ - remote_printk(__printk); \ + __printk; \ } + +#define REMOTE_EVENT(__name, __id, __struct, __printk) \ + REMOTE_EVENT_FORMAT(__name, __struct); \ + REMOTE_EVENT_PRINT_FUNC(__name, remote_printk(__printk)) + +#define REMOTE_EVENT_CUSTOM_PRINTK(__name, __id, __struct, __printk) \ + REMOTE_EVENT_FORMAT(__name, __struct); \ + REMOTE_EVENT_PRINT_FUNC(__name, __printk) + #include REMOTE_EVENT_INCLUDE(REMOTE_EVENT_INCLUDE_FILE) #undef REMOTE_EVENT +#undef REMOTE_EVENT_CUSTOM_PRINTK #undef RE_PRINTK #undef re_field #define re_field(__type, __field) \
@@ -70,4 +79,8 @@ do { \ .print_fmt = remote_event_print_fmt_##__name, \ .print = remote_event_print_##__name, \ } + +#define REMOTE_EVENT_CUSTOM_PRINTK(__name, __id, __struct, __printk) \ + REMOTE_EVENT(__name, __id, RE_STRUCT(__struct), "Unknown") + #include REMOTE_EVENT_INCLUDE(REMOTE_EVENT_INCLUDE_FILE)
--
2.55.0.795.g602f6c329a-goog