x86 mmiotrace: use lookup_address()

Use lookup_address() from pageattr.c instead of doing the same
manually. Also had to EXPORT_SYMBOL_GPL(lookup_address) to make this
work for modules. This also fixes "undefined symbol 'init_mm'"
compile error for x86_32.

Signed-off-by: Pekka Paalanen <pq@iki.fi>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

diff --git a/arch/x86/kernel/mmiotrace/kmmio.c b/arch/x86/kernel/mmiotrace/kmmio.c
index 8ba48f9..28411da 100644 (file)
--- a/arch/x86/kernel/mmiotrace/kmmio.c
+++ b/arch/x86/kernel/mmiotrace/kmmio.c
@@ -20,6 +20,7 @@
 #include <asm/cacheflush.h>
 #include <asm/errno.h>
 #include <asm/tlbflush.h>
+#include <asm/pgtable.h>
 
 #include "kmmio.h"
 
@@ -117,40 +118,55 @@ static struct kmmio_fault_page *get_kmmio_fault_page(unsigned long page)
        return NULL;
 }
 
-static void arm_kmmio_fault_page(unsigned long page, int *large)
+static void arm_kmmio_fault_page(unsigned long page, int *page_level)
 {
        unsigned long address = page & PAGE_MASK;
-       pgd_t *pgd = pgd_offset_k(address);
-       pud_t *pud = pud_offset(pgd, address);
-       pmd_t *pmd = pmd_offset(pud, address);
-       pte_t *pte = pte_offset_kernel(pmd, address);
+       int level;
+       pte_t *pte = lookup_address(address, &level);
 
-       if (pmd_large(*pmd)) {
+       if (!pte) {
+               printk(KERN_ERR "Error in %s: no pte for page 0x%08lx\n",
+                                               __FUNCTION__, page);
+               return;
+       }
+
+       if (level == PG_LEVEL_2M) {
+               pmd_t *pmd = (pmd_t *)pte;
                set_pmd(pmd, __pmd(pmd_val(*pmd) & ~_PAGE_PRESENT));
-               if (large)
-                       *large = 1;
        } else {
+               /* PG_LEVEL_4K */
                set_pte(pte, __pte(pte_val(*pte) & ~_PAGE_PRESENT));
        }
 
+       if (page_level)
+               *page_level = level;
+
        __flush_tlb_one(page);
 }
 
-static void disarm_kmmio_fault_page(unsigned long page, int *large)
+static void disarm_kmmio_fault_page(unsigned long page, int *page_level)
 {
        unsigned long address = page & PAGE_MASK;
-       pgd_t *pgd = pgd_offset_k(address);
-       pud_t *pud = pud_offset(pgd, address);
-       pmd_t *pmd = pmd_offset(pud, address);
-       pte_t *pte = pte_offset_kernel(pmd, address);
+       int level;
+       pte_t *pte = lookup_address(address, &level);
 
-       if (large && *large) {
+       if (!pte) {
+               printk(KERN_ERR "Error in %s: no pte for page 0x%08lx\n",
+                                               __FUNCTION__, page);
+               return;
+       }
+
+       if (level == PG_LEVEL_2M) {
+               pmd_t *pmd = (pmd_t *)pte;
                set_pmd(pmd, __pmd(pmd_val(*pmd) | _PAGE_PRESENT));
-               *large = 0;
        } else {
+               /* PG_LEVEL_4K */
                set_pte(pte, __pte(pte_val(*pte) | _PAGE_PRESENT));
        }
 
+       if (page_level)
+               *page_level = level;
+
        __flush_tlb_one(page);
 }
 

diff --git a/arch/x86/kernel/mmiotrace/mmio-mod.c b/arch/x86/kernel/mmiotrace/mmio-mod.c
index 73561fe..e43947d 100644 (file)
--- a/arch/x86/kernel/mmiotrace/mmio-mod.c
+++ b/arch/x86/kernel/mmiotrace/mmio-mod.c
@@ -120,19 +120,24 @@ static int write_marker(struct file *file, const char __user *buffer,
 
 static void print_pte(unsigned long address)
 {
-       pgd_t *pgd = pgd_offset_k(address);
-       pud_t *pud = pud_offset(pgd, address);
-       pmd_t *pmd = pmd_offset(pud, address);
-       if (pmd_large(*pmd)) {
+       int level;
+       pte_t *pte = lookup_address(address, &level);
+
+       if (!pte) {
+               printk(KERN_ERR "Error in %s: no pte for page 0x%08lx\n",
+                                               __FUNCTION__, address);
+               return;
+       }
+
+       if (level == PG_LEVEL_2M) {
                printk(KERN_EMERG MODULE_NAME ": 4MB pages are not "
                                                "currently supported: %lx\n",
                                                address);
                BUG();
        }
        printk(KERN_DEBUG MODULE_NAME ": pte for 0x%lx: 0x%lx 0x%lx\n",
-               address,
-               pte_val(*pte_offset_kernel(pmd, address)),
-               pte_val(*pte_offset_kernel(pmd, address)) & _PAGE_PRESENT);
+                                       address, pte_val(*pte),
+                                       pte_val(*pte) & _PAGE_PRESENT);
 }
 
 /*

diff --git a/arch/x86/mm/pageattr.c b/arch/x86/mm/pageattr.c
index 60bcb5b..57970f2 100644 (file)
--- a/arch/x86/mm/pageattr.c
+++ b/arch/x86/mm/pageattr.c
@@ -227,6 +227,7 @@ pte_t *lookup_address(unsigned long address, unsigned int *level)
 
        return pte_offset_kernel(pmd, address);
 }
+EXPORT_SYMBOL_GPL(lookup_address);
 
 /*
  * Set the new pmd in all the pgds we know about: