x86: fix assumed to be contiguous leaf page tables for kmap_atomic region (take 2)

[linux-2.6-omap-h63xx.git] / arch / x86 / mm / init_32.c

diff --git a/arch/x86/mm/init_32.c b/arch/x86/mm/init_32.c
index f99a6c6c432ebc5e53fac79bce694384c2ccdb05..2cef050744131698ff7239192b04a7ba136d9153 100644 (file)
--- a/arch/x86/mm/init_32.c
+++ b/arch/x86/mm/init_32.c
@@ -138,6 +138,47 @@ static pte_t * __init one_page_table_init(pmd_t *pmd)
        return pte_offset_kernel(pmd, 0);
 }
 
+static pte_t *__init page_table_kmap_check(pte_t *pte, pmd_t *pmd,
+                                          unsigned long vaddr, pte_t *lastpte)
+{
+#ifdef CONFIG_HIGHMEM
+       /*
+        * Something (early fixmap) may already have put a pte
+        * page here, which causes the page table allocation
+        * to become nonlinear. Attempt to fix it, and if it
+        * is still nonlinear then we have to bug.
+        */
+       int pmd_idx_kmap_begin = fix_to_virt(FIX_KMAP_END) >> PMD_SHIFT;
+       int pmd_idx_kmap_end = fix_to_virt(FIX_KMAP_BEGIN) >> PMD_SHIFT;
+
+       if (pmd_idx_kmap_begin != pmd_idx_kmap_end
+           && (vaddr >> PMD_SHIFT) >= pmd_idx_kmap_begin
+           && (vaddr >> PMD_SHIFT) <= pmd_idx_kmap_end
+           && ((__pa(pte) >> PAGE_SHIFT) < table_start
+               || (__pa(pte) >> PAGE_SHIFT) >= table_end)) {
+               pte_t *newpte;
+               int i;
+
+               BUG_ON(after_init_bootmem);
+               newpte = alloc_low_page();
+               for (i = 0; i < PTRS_PER_PTE; i++)
+                       set_pte(newpte + i, pte[i]);
+
+               paravirt_alloc_pte(&init_mm, __pa(newpte) >> PAGE_SHIFT);
+               set_pmd(pmd, __pmd(__pa(newpte)|_PAGE_TABLE));
+               BUG_ON(newpte != pte_offset_kernel(pmd, 0));
+               __flush_tlb_all();
+
+               paravirt_release_pte(__pa(pte) >> PAGE_SHIFT);
+               pte = newpte;
+       }
+       BUG_ON(vaddr < fix_to_virt(FIX_KMAP_BEGIN - 1)
+              && vaddr > fix_to_virt(FIX_KMAP_END)
+              && lastpte && lastpte + PTRS_PER_PTE != pte);
+#endif
+       return pte;
+}
+
 /*
  * This function initializes a certain range of kernel virtual memory
  * with new bootmem page tables, everywhere page tables are missing in
@@ -154,6 +195,7 @@ page_table_range_init(unsigned long start, unsigned long end, pgd_t *pgd_base)
        unsigned long vaddr;
        pgd_t *pgd;
        pmd_t *pmd;
+       pte_t *pte = NULL;
 
        vaddr = start;
        pgd_idx = pgd_index(vaddr);
@@ -165,7 +207,8 @@ page_table_range_init(unsigned long start, unsigned long end, pgd_t *pgd_base)
                pmd = pmd + pmd_index(vaddr);
                for (; (pmd_idx < PTRS_PER_PMD) && (vaddr != end);
                                                        pmd++, pmd_idx++) {
-                       one_page_table_init(pmd);
+                       pte = page_table_kmap_check(one_page_table_init(pmd),
+                                                   pmd, vaddr, pte);
 
                        vaddr += PMD_SIZE;
                }
@@ -328,6 +371,8 @@ int devmem_is_allowed(unsigned long pagenr)
 {
        if (pagenr <= 256)
                return 1;
+       if (iomem_is_exclusive(pagenr << PAGE_SHIFT))
+               return 0;
        if (!page_is_ram(pagenr))
                return 1;
        return 0;
@@ -506,7 +551,6 @@ static void __init early_ioremap_page_table_range_init(pgd_t *pgd_base)
         * Fixed mappings, only the page table structure has to be
         * created - mappings will be set by set_fixmap():
         */
-       early_ioremap_clear();
        vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK;
        end = (FIXADDR_TOP + PMD_SIZE - 1) & PMD_MASK;
        page_table_range_init(vaddr, end, pgd_base);
@@ -799,7 +843,7 @@ static void __init find_early_table_space(unsigned long end, int use_pse)
        tables += PAGE_ALIGN(ptes * sizeof(pte_t));
 
        /* for fixmap */
-       tables += PAGE_SIZE * 2;
+       tables += PAGE_ALIGN(__end_of_fixed_addresses * sizeof(pte_t));
 
        /*
         * RED-PEN putting page tables only on node 0 could
@@ -1079,7 +1123,7 @@ int arch_add_memory(int nid, u64 start, u64 size)
        unsigned long start_pfn = start >> PAGE_SHIFT;
        unsigned long nr_pages = size >> PAGE_SHIFT;
 
-       return __add_pages(zone, start_pfn, nr_pages);
+       return __add_pages(nid, zone, start_pfn, nr_pages);
 }
 #endif