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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: Pekka Enberg <penberg@cs.helsinki.fi>
This commit is contained in:
Pekka Enberg 2008-10-10 10:57:44 +03:00
parent 2e67624c22
commit faa97abe6a
1 changed files with 13 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

26
mm/kmemtrace.c
View File

@ -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;
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;
}
printk(KERN_INFO "kmemtrace: early init successful.\n");
return;
probe_fail:
printk(KERN_ERR "kmemtrace: could not register marker probes!\n");
kmemtrace_cleanup();
printk(KERN_INFO "kmemtrace: enabled.\n");
}