x86: query dynamic DEBUG_PAGEALLOC setting

[uclinux-h8/linux.git] / arch / x86 / mm / pageattr.c

diff --git a/arch/x86/mm/pageattr.c b/arch/x86/mm/pageattr.c
index 2440814..e64a470 100644 (file)
--- a/arch/x86/mm/pageattr.c
+++ b/arch/x86/mm/pageattr.c
@@ -106,12 +106,6 @@ static inline unsigned long highmap_end_pfn(void)
 
 #endif
 
-#ifdef CONFIG_DEBUG_PAGEALLOC
-# define debug_pagealloc 1
-#else
-# define debug_pagealloc 0
-#endif
-
 static inline int
 within(unsigned long addr, unsigned long start, unsigned long end)
 {
@@ -283,7 +277,7 @@ static inline pgprot_t static_protections(pgprot_t prot, unsigned long address,
                   __pa_symbol(__end_rodata) >> PAGE_SHIFT))
                pgprot_val(forbidden) |= _PAGE_RW;
 
-#if defined(CONFIG_X86_64) && defined(CONFIG_DEBUG_RODATA)
+#if defined(CONFIG_X86_64)
        /*
         * Once the kernel maps the text as RO (kernel_set_to_readonly is set),
         * kernel text mappings for the large page aligned text, rodata sections
@@ -419,24 +413,30 @@ pmd_t *lookup_pmd_address(unsigned long address)
 phys_addr_t slow_virt_to_phys(void *__virt_addr)
 {
        unsigned long virt_addr = (unsigned long)__virt_addr;
-       unsigned long phys_addr, offset;
+       phys_addr_t phys_addr;
+       unsigned long offset;
        enum pg_level level;
        pte_t *pte;
 
        pte = lookup_address(virt_addr, &level);
        BUG_ON(!pte);
 
+       /*
+        * pXX_pfn() returns unsigned long, which must be cast to phys_addr_t
+        * before being left-shifted PAGE_SHIFT bits -- this trick is to
+        * make 32-PAE kernel work correctly.
+        */
        switch (level) {
        case PG_LEVEL_1G:
-               phys_addr = pud_pfn(*(pud_t *)pte) << PAGE_SHIFT;
+               phys_addr = (phys_addr_t)pud_pfn(*(pud_t *)pte) << PAGE_SHIFT;
                offset = virt_addr & ~PUD_PAGE_MASK;
                break;
        case PG_LEVEL_2M:
-               phys_addr = pmd_pfn(*(pmd_t *)pte) << PAGE_SHIFT;
+               phys_addr = (phys_addr_t)pmd_pfn(*(pmd_t *)pte) << PAGE_SHIFT;
                offset = virt_addr & ~PMD_PAGE_MASK;
                break;
        default:
-               phys_addr = pte_pfn(*pte) << PAGE_SHIFT;
+               phys_addr = (phys_addr_t)pte_pfn(*pte) << PAGE_SHIFT;
                offset = virt_addr & ~PAGE_MASK;
        }
 
@@ -708,10 +708,10 @@ static int split_large_page(struct cpa_data *cpa, pte_t *kpte,
 {
        struct page *base;
 
-       if (!debug_pagealloc)
+       if (!debug_pagealloc_enabled())
                spin_unlock(&cpa_lock);
        base = alloc_pages(GFP_KERNEL | __GFP_NOTRACK, 0);
-       if (!debug_pagealloc)
+       if (!debug_pagealloc_enabled())
                spin_lock(&cpa_lock);
        if (!base)
                return -ENOMEM;
@@ -1331,10 +1331,10 @@ static int __change_page_attr_set_clr(struct cpa_data *cpa, int checkalias)
                if (cpa->flags & (CPA_ARRAY | CPA_PAGES_ARRAY))
                        cpa->numpages = 1;
 
-               if (!debug_pagealloc)
+               if (!debug_pagealloc_enabled())
                        spin_lock(&cpa_lock);
                ret = __change_page_attr(cpa, checkalias);
-               if (!debug_pagealloc)
+               if (!debug_pagealloc_enabled())
                        spin_unlock(&cpa_lock);
                if (ret)
                        return ret;