x86: add mtrr_cleanup_debug command line

add mtrr_cleanup_debug to print out more info about layout

Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
Cc: Yinghai Lu <yhlu.kernel@gmail.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 11 insertions, 3 deletions

diff --git a/arch/x86/kernel/cpu/mtrr/main.c b/arch/x86/kernel/cpu/mtrr/main.c
index 93d575ac61a3..aff46b99ff01 100644
--- a/arch/x86/kernel/cpu/mtrr/main.c
+++ b/arch/x86/kernel/cpu/mtrr/main.c
@@ -836,6 +836,13 @@ static int __init enable_mtrr_cleanup_setup(char *str)
 }
 early_param("enble_mtrr_cleanup", enable_mtrr_cleanup_setup);
 
+static int __init mtrr_cleanup_debug_setup(char *str)
+{
+        debug_print = 1;
+        return 0;
+}
+early_param("mtrr_cleanup_debug", mtrr_cleanup_debug_setup);
+
 struct var_mtrr_state {
         unsigned long   range_startk;
         unsigned long   range_sizek;
@@ -1227,7 +1234,7 @@ static int __init mtrr_cleanup(unsigned address_bits)
         if (mtrr_chunk_size && mtrr_gran_size) {
                 int num_reg;
 
-                debug_print = 1;
+                debug_print++;
                 /* convert ranges to var ranges state */
                 num_reg = x86_setup_var_mtrrs(range, nr_range, mtrr_chunk_size,
                                               mtrr_gran_size);
@@ -1263,7 +1270,7 @@ static int __init mtrr_cleanup(unsigned address_bits)
                 }
                 printk(KERN_INFO "invalid mtrr_gran_size or mtrr_chunk_size, "
                        "will find optimal one\n");
-                debug_print = 0;
+                debug_print--;
                 memset(result, 0, sizeof(result[0]));
         }
 
@@ -1366,8 +1373,9 @@ static int __init mtrr_cleanup(unsigned address_bits)
                 chunk_size <<= 10;
                 gran_size = result[i].gran_sizek;
                 gran_size <<= 10;
-                debug_print = 1;
+                debug_print++;
                 x86_setup_var_mtrrs(range, nr_range, chunk_size, gran_size);
+                debug_print--;
                 set_var_mtrr_all(address_bits);
                 return 1;
         }