x86: add "debugpat" boot option

enable debug messages by a boot option "debugpat".

Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 20 insertions, 7 deletions

diff --git a/arch/x86/mm/pat.c b/arch/x86/mm/pat.c
index 60adbe22efa..1a82f4db8a4 100644
--- a/arch/x86/mm/pat.c
+++ b/arch/x86/mm/pat.c
@@ -42,6 +42,19 @@ static int nopat(char *str)
 early_param("nopat", nopat);
 #endif
 
+
+static int debug_enable;
+static int __init pat_debug_setup(char *str)
+{
+        debug_enable = 1;
+        return 0;
+}
+__setup("debugpat", pat_debug_setup);
+
+#define dprintk(fmt, arg...) \
+        do { if (debug_enable) printk(KERN_INFO fmt, ##arg); } while (0)
+
+
 static u64 __read_mostly boot_pat_state;
 
 enum {
@@ -279,7 +292,7 @@ int reserve_memtype(u64 start, u64 end, unsigned long req_type,
                 struct memtype *saved_ptr;
 
                 if (parse->start >= end) {
-                        pr_debug("New Entry\n");
+                        dprintk("New Entry\n");
                         list_add(&new_entry->nd, parse->nd.prev);
                         new_entry = NULL;
                         break;
@@ -329,7 +342,7 @@ int reserve_memtype(u64 start, u64 end, unsigned long req_type,
                                 break;
                         }
 
-                        pr_debug("Overlap at 0x%Lx-0x%Lx\n",
+                        dprintk("Overlap at 0x%Lx-0x%Lx\n",
                                saved_ptr->start, saved_ptr->end);
                         /* No conflict. Go ahead and add this new entry */
                         list_add(&new_entry->nd, saved_ptr->nd.prev);
@@ -381,7 +394,7 @@ int reserve_memtype(u64 start, u64 end, unsigned long req_type,
                                 break;
                         }
 
-                        pr_debug(KERN_INFO "Overlap at 0x%Lx-0x%Lx\n",
+                        dprintk("Overlap at 0x%Lx-0x%Lx\n",
                                  saved_ptr->start, saved_ptr->end);
                         /* No conflict. Go ahead and add this new entry */
                         list_add(&new_entry->nd, &saved_ptr->nd);
@@ -403,16 +416,16 @@ int reserve_memtype(u64 start, u64 end, unsigned long req_type,
         if (new_entry) {
                 /* No conflict. Not yet added to the list. Add to the tail */
                 list_add_tail(&new_entry->nd, &memtype_list);
-                pr_debug("New Entry\n");
+                dprintk("New Entry\n");
         }
 
         if (ret_type) {
-                pr_debug(
+                dprintk(
         "reserve_memtype added 0x%Lx-0x%Lx, track %s, req %s, ret %s\n",
                         start, end, cattr_name(actual_type),
                         cattr_name(req_type), cattr_name(*ret_type));
         } else {
-                pr_debug(
+                dprintk(
         "reserve_memtype added 0x%Lx-0x%Lx, track %s, req %s\n",
                         start, end, cattr_name(actual_type),
                         cattr_name(req_type));
@@ -453,7 +466,7 @@ int free_memtype(u64 start, u64 end)
                         current->comm, current->pid, start, end);
         }
 
-        pr_debug("free_memtype request 0x%Lx-0x%Lx\n", start, end);
+        dprintk("free_memtype request 0x%Lx-0x%Lx\n", start, end);
         return err;
 }