[PATCH v5 05/25] tracing: Add init callback to trace remotes
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STALE508d
From: Vincent Donnefort <hidden>
Date: 2025-05-16 13:40:45
Also in:
kvmarm, linux-arm-kernel, lkml
Subsystem:
the rest, tracing · Maintainers:
Linus Torvalds, Steven Rostedt, Masami Hiramatsu
Revision v5 of 15 in this series.
Revisions (15)
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- v5 current
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Add a .init call back so the trace remote callers can add entries to the tracefs directory. Signed-off-by: Vincent Donnefort <redacted>
diff --git a/include/linux/trace_remote.h b/include/linux/trace_remote.h
index 1aa99da3c96a..82d26d97a536 100644
--- a/include/linux/trace_remote.h
+++ b/include/linux/trace_remote.h@@ -3,9 +3,11 @@ #ifndef _LINUX_TRACE_REMOTE_H #define _LINUX_TRACE_REMOTE_H +#include <linux/dcache.h> #include <linux/ring_buffer.h> 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);
diff --git a/kernel/trace/trace_remote.c b/kernel/trace/trace_remote.c
index 18b2930186cc..8f8eb1f1e889 100644
--- a/kernel/trace/trace_remote.c
+++ b/kernel/trace/trace_remote.c@@ -482,6 +482,7 @@ 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)
@@ -498,7 +499,11 @@ 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; } void trace_remote_free_buffer(struct trace_buffer_desc *desc)
--
2.49.0.1101.gccaa498523-goog