[PATCH] mtrr size-and-base debugging

Consolidate the mtrr sanity checking, add a dump_stack().

Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 15 insertions, 8 deletions

diff --git a/arch/i386/kernel/cpu/mtrr/main.c b/arch/i386/kernel/cpu/mtrr/main.c
index e1c2042b9b7..d66b09e0c82 100644
--- a/arch/i386/kernel/cpu/mtrr/main.c
+++ b/arch/i386/kernel/cpu/mtrr/main.c
@@ -375,6 +375,19 @@ int mtrr_add_page(unsigned long base, unsigned long size,
         return error;
 }
 
+static int mtrr_check(unsigned long base, unsigned long size)
+{
+        if ((base & (PAGE_SIZE - 1)) || (size & (PAGE_SIZE - 1))) {
+                printk(KERN_WARNING
+                        "mtrr: size and base must be multiples of 4 kiB\n");
+                printk(KERN_DEBUG
+                        "mtrr: size: 0x%lx  base: 0x%lx\n", size, base);
+                dump_stack();
+                return -1;
+        }
+        return 0;
+}
+
 /**
  *      mtrr_add - Add a memory type region
  *      @base: Physical base address of region
@@ -415,11 +428,8 @@ int
 mtrr_add(unsigned long base, unsigned long size, unsigned int type,
          char increment)
 {
-        if ((base & (PAGE_SIZE - 1)) || (size & (PAGE_SIZE - 1))) {
-                printk(KERN_WARNING "mtrr: size and base must be multiples of 4 kiB\n");
-                printk(KERN_DEBUG "mtrr: size: 0x%lx  base: 0x%lx\n", size, base);
+        if (mtrr_check(base, size))
                 return -EINVAL;
-        }
         return mtrr_add_page(base >> PAGE_SHIFT, size >> PAGE_SHIFT, type,
                              increment);
 }
@@ -511,11 +521,8 @@ int mtrr_del_page(int reg, unsigned long base, unsigned long size)
 int
 mtrr_del(int reg, unsigned long base, unsigned long size)
 {
-        if ((base & (PAGE_SIZE - 1)) || (size & (PAGE_SIZE - 1))) {
-                printk(KERN_INFO "mtrr: size and base must be multiples of 4 kiB\n");
-                printk(KERN_DEBUG "mtrr: size: 0x%lx  base: 0x%lx\n", size, base);
+        if (mtrr_check(base, size))
                 return -EINVAL;
-        }
         return mtrr_del_page(reg, base >> PAGE_SHIFT, size >> PAGE_SHIFT);
 }