Add a .init call back so the trace remote callers can add entries to the tracefs directory.
Signed-off-by: Vincent Donnefort <[email protected]> diff --git a/include/linux/trace_remote.h b/include/linux/trace_remote.h index 55754ef78104..15a579633123 100644 --- a/include/linux/trace_remote.h +++ b/include/linux/trace_remote.h @@ -3,11 +3,14 @@ #ifndef _LINUX_TRACE_REMOTE_H #define _LINUX_TRACE_REMOTE_H +#include <linux/dcache.h> #include <linux/ring_buffer.h> /** * struct trace_remote_callbacks - Callbacks used by Tracefs to control the remote * + * @init: Called once the remote has been registered. Allows the + * caller to extend the Tracefs remote directory * @load_trace_buffer: Called before Tracefs accesses the trace buffer for the first * time. Must return a &trace_buffer_desc * (most likely filled with trace_remote_alloc_buffer()) @@ -23,6 +26,7 @@ * new reader-page from the @cpu ring-buffer. */ struct trace_remote_callbacks { + int (*init)(struct dentry *d, void *priv); struct trace_buffer_desc *(*load_trace_buffer)(unsigned long size, void *priv); void (*unload_trace_buffer)(struct trace_buffer_desc *desc, void *priv); int (*enable_tracing)(bool enable, void *priv); diff --git a/kernel/trace/trace_remote.c b/kernel/trace/trace_remote.c index a744bbf48e88..924e3f3ec6d2 100644 --- a/kernel/trace/trace_remote.c +++ b/kernel/trace/trace_remote.c @@ -837,6 +837,7 @@ static int trace_remote_init_tracefs(const char *name, struct trace_remote *remo int trace_remote_register(const char *name, struct trace_remote_callbacks *cbs, void *priv) { struct trace_remote *remote; + int ret; remote = kzalloc(sizeof(*remote), GFP_KERNEL); if (!remote) @@ -854,7 +855,11 @@ int trace_remote_register(const char *name, struct trace_remote_callbacks *cbs, return -ENOMEM; } - return 0; + ret = cbs->init ? cbs->init(remote->dentry, priv) : 0; + if (ret) + pr_err("Init failed for trace remote '%s' (%d)\n", name, ret); + + return ret; } EXPORT_SYMBOL_GPL(trace_remote_register); -- 2.52.0.107.ga0afd4fd5b-goog
