under /proc/sys/kernel/printk_tag/ will have acpi, apic, dev, pci
Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
---
init/main.c | 56 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 56 insertions(+)
Index: linux-2.6/init/main.c
===================================================================
--- linux-2.6.orig/init/main.c
+++ linux-2.6/init/main.c
@@ -63,6 +63,8 @@
#include <linux/idr.h>
#include <linux/kmemcheck.h>
#include <linux/ftrace.h>
+#include <linux/sysctl.h>
+#include <linux/proc_fs.h>
#include <asm/io.h>
#include <asm/bugs.h>
@@ -395,6 +397,60 @@ static int __init quiet_kernel(char *str
early_param("debug", debug_kernel);
early_param("quiet", quiet_kernel);
+#ifdef CONFIG_SYSCTL
+static struct ctl_table printk_tag_ctl_dir[] = {
+ {
+ .procname = "printk_tag",
+ .mode = 0555,
+ },
+ {0, },
+};
+
+static struct ctl_table printk_tag_ctl_root[] = {
+ {
+ .ctl_name = CTL_KERN,
+ .procname = "kernel",
+ .mode = 0555,
+ .child = printk_tag_ctl_dir,
+ },
+ {0, },
+};
+
+static int __init proc_printk_tag_init(void)
+{
+ int i;
+ struct ctl_table *entry;
+ char buf[32];
+
+ entry = kcalloc(tag_level_nr + 1, sizeof(struct ctl_table), GFP_KERNEL);
+ if (entry == NULL)
+ return -1;
+
+ WARN_ON(printk_tag_ctl_dir[0].child);
+ printk_tag_ctl_dir[0].child = entry;
+
+
+ for (i = 0; i < tag_level_nr; i++) {
+ int len;
+
+ len = strlen(tag_level[i].name);
+ memset(buf, 0, sizeof(buf));
+ strncpy(buf, tag_level[i].name, len - 1);
+ entry->procname = kstrdup(buf, GFP_KERNEL);
+ entry->data = &tag_level[i].level;
+ entry->maxlen = sizeof(tag_level[i].level);
+ entry->mode = 0644;
+ entry->proc_handler = proc_dointvec;
+ entry++;
+ }
+
+ register_sysctl_table(printk_tag_ctl_root);
+
+ return 0;
+}
+fs_initcall(proc_printk_tag_init);
+#endif
+
/*
* Unknown boot options get handed to init, unless they look like
* failed parameters
--
