提交 faa97abe 编写于 作者: P Pekka Enberg

kmemtrace: allow kmemtrace to be enabled after boot

The kmemtrace_init() function returns early if kmemtrace is disabled at boot
causing kmemtrace_setup_late() to also bail out on NULL channel. This has the
unfortunate side effect that none of the debugfs files needed to enable
kmemtrace after boot are created.

Cc: Eduard - Gabriel Munteanu <eduard.munteanu@linux360.ro>
Signed-off-by: NPekka Enberg <penberg@cs.helsinki.fi>
上级 2e67624c
......@@ -307,29 +307,29 @@ early_param("kmemtrace.subbufs", kmemtrace_set_subbufs);
void kmemtrace_init(void)
{
if (!kmemtrace_enabled)
return;
if (!kmemtrace_n_subbufs)
kmemtrace_n_subbufs = KMEMTRACE_DEF_N_SUBBUFS;
kmemtrace_chan = relay_open(NULL, NULL, KMEMTRACE_SUBBUF_SIZE,
kmemtrace_n_subbufs, &relay_callbacks,
NULL);
if (unlikely(!kmemtrace_chan)) {
if (!kmemtrace_chan) {
printk(KERN_ERR "kmemtrace: could not open relay channel.\n");
return;
}
if (unlikely(kmemtrace_start_probes()))
goto probe_fail;
printk(KERN_INFO "kmemtrace: early init successful.\n");
return;
if (!kmemtrace_enabled) {
printk(KERN_INFO "kmemtrace: disabled. Pass "
"kemtrace.enable=yes as kernel parameter for "
"boot-time tracing.");
return;
}
if (kmemtrace_start_probes()) {
printk(KERN_ERR "kmemtrace: could not register marker probes!\n");
kmemtrace_cleanup();
return;
}
probe_fail:
printk(KERN_ERR "kmemtrace: could not register marker probes!\n");
kmemtrace_cleanup();
printk(KERN_INFO "kmemtrace: enabled.\n");
}
Markdown is supported
0% .
You are about to add 0 people to the discussion. Proceed with caution.
先完成此消息的编辑!
想要评论请 注册