#include <linux/init.h>
#include <linux/highmem.h>
#include <linux/pagemap.h>
+#include <linux/pci.h>
#include <linux/pfn.h>
#include <linux/poison.h>
#include <linux/bootmem.h>
#include <linux/cpumask.h>
#include <asm/asm.h>
+#include <asm/bios_ebda.h>
#include <asm/processor.h>
#include <asm/system.h>
#include <asm/uaccess.h>
#include <asm/paravirt.h>
#include <asm/setup.h>
#include <asm/cacheflush.h>
+#include <asm/smp.h>
unsigned int __VMALLOC_RESERVE = 128 << 20;
+unsigned long max_low_pfn_mapped;
unsigned long max_pfn_mapped;
DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
static noinline int do_test_wp_bit(void);
+
+static unsigned long __initdata table_start;
+static unsigned long __meminitdata table_end;
+static unsigned long __meminitdata table_top;
+
+static int __initdata after_init_bootmem;
+
+static __init void *alloc_low_page(void)
+{
+ unsigned long pfn = table_end++;
+ void *adr;
+
+ if (pfn >= table_top)
+ panic("alloc_low_page: ran out of memory");
+
+ adr = __va(pfn * PAGE_SIZE);
+ memset(adr, 0, PAGE_SIZE);
+ return adr;
+}
+
/*
* Creates a middle page table and puts a pointer to it in the
* given global directory entry. This only returns the gd entry
#ifdef CONFIG_X86_PAE
if (!(pgd_val(*pgd) & _PAGE_PRESENT)) {
- pmd_table = (pmd_t *) alloc_bootmem_low_pages(PAGE_SIZE);
-
+ if (after_init_bootmem)
+ pmd_table = (pmd_t *)alloc_bootmem_low_pages(PAGE_SIZE);
+ else
+ pmd_table = (pmd_t *)alloc_low_page();
paravirt_alloc_pmd(&init_mm, __pa(pmd_table) >> PAGE_SHIFT);
set_pgd(pgd, __pgd(__pa(pmd_table) | _PAGE_PRESENT));
pud = pud_offset(pgd, 0);
BUG_ON(pmd_table != pmd_offset(pud, 0));
+
+ return pmd_table;
}
#endif
pud = pud_offset(pgd, 0);
if (!(pmd_val(*pmd) & _PAGE_PRESENT)) {
pte_t *page_table = NULL;
+ if (after_init_bootmem) {
#ifdef CONFIG_DEBUG_PAGEALLOC
- page_table = (pte_t *) alloc_bootmem_pages(PAGE_SIZE);
+ page_table = (pte_t *) alloc_bootmem_pages(PAGE_SIZE);
#endif
- if (!page_table) {
- page_table =
+ if (!page_table)
+ page_table =
(pte_t *)alloc_bootmem_low_pages(PAGE_SIZE);
- }
+ } else
+ page_table = (pte_t *)alloc_low_page();
paravirt_alloc_pte(&init_mm, __pa(page_table) >> PAGE_SHIFT);
set_pmd(pmd, __pmd(__pa(page_table) | _PAGE_TABLE));
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
unsigned long vaddr;
pgd_t *pgd;
pmd_t *pmd;
+ pte_t *pte = NULL;
vaddr = start;
pgd_idx = pgd_index(vaddr);
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;
}
* of max_low_pfn pages, by creating page tables starting from address
* PAGE_OFFSET:
*/
-static void __init kernel_physical_mapping_init(pgd_t *pgd_base)
+static void __init kernel_physical_mapping_init(pgd_t *pgd_base,
+ unsigned long start_pfn,
+ unsigned long end_pfn,
+ int use_pse)
{
int pgd_idx, pmd_idx, pte_ofs;
unsigned long pfn;
pgd_t *pgd;
pmd_t *pmd;
pte_t *pte;
- unsigned pages_2m = 0, pages_4k = 0;
+ unsigned pages_2m, pages_4k;
+ int mapping_iter;
- pgd_idx = pgd_index(PAGE_OFFSET);
- pgd = pgd_base + pgd_idx;
- pfn = 0;
+ /*
+ * First iteration will setup identity mapping using large/small pages
+ * based on use_pse, with other attributes same as set by
+ * the early code in head_32.S
+ *
+ * Second iteration will setup the appropriate attributes (NX, GLOBAL..)
+ * as desired for the kernel identity mapping.
+ *
+ * This two pass mechanism conforms to the TLB app note which says:
+ *
+ * "Software should not write to a paging-structure entry in a way
+ * that would change, for any linear address, both the page size
+ * and either the page frame or attributes."
+ */
+ mapping_iter = 1;
+
+ if (!cpu_has_pse)
+ use_pse = 0;
+repeat:
+ pages_2m = pages_4k = 0;
+ pfn = start_pfn;
+ pgd_idx = pgd_index((pfn<<PAGE_SHIFT) + PAGE_OFFSET);
+ pgd = pgd_base + pgd_idx;
for (; pgd_idx < PTRS_PER_PGD; pgd++, pgd_idx++) {
pmd = one_md_table_init(pgd);
- if (pfn >= max_low_pfn)
- continue;
- for (pmd_idx = 0;
- pmd_idx < PTRS_PER_PMD && pfn < max_low_pfn;
+ if (pfn >= end_pfn)
+ continue;
+#ifdef CONFIG_X86_PAE
+ pmd_idx = pmd_index((pfn<<PAGE_SHIFT) + PAGE_OFFSET);
+ pmd += pmd_idx;
+#else
+ pmd_idx = 0;
+#endif
+ for (; pmd_idx < PTRS_PER_PMD && pfn < end_pfn;
pmd++, pmd_idx++) {
unsigned int addr = pfn * PAGE_SIZE + PAGE_OFFSET;
/*
* Map with big pages if possible, otherwise
* create normal page tables:
- *
- * Don't use a large page for the first 2/4MB of memory
- * because there are often fixed size MTRRs in there
- * and overlapping MTRRs into large pages can cause
- * slowdowns.
*/
- if (cpu_has_pse && !(pgd_idx == 0 && pmd_idx == 0)) {
+ if (use_pse) {
unsigned int addr2;
pgprot_t prot = PAGE_KERNEL_LARGE;
+ /*
+ * first pass will use the same initial
+ * identity mapping attribute + _PAGE_PSE.
+ */
+ pgprot_t init_prot =
+ __pgprot(PTE_IDENT_ATTR |
+ _PAGE_PSE);
addr2 = (pfn + PTRS_PER_PTE-1) * PAGE_SIZE +
PAGE_OFFSET + PAGE_SIZE-1;
prot = PAGE_KERNEL_LARGE_EXEC;
pages_2m++;
- set_pmd(pmd, pfn_pmd(pfn, prot));
+ if (mapping_iter == 1)
+ set_pmd(pmd, pfn_pmd(pfn, init_prot));
+ else
+ set_pmd(pmd, pfn_pmd(pfn, prot));
pfn += PTRS_PER_PTE;
- max_pfn_mapped = pfn;
continue;
}
pte = one_page_table_init(pmd);
- for (pte_ofs = 0;
- pte_ofs < PTRS_PER_PTE && pfn < max_low_pfn;
+ pte_ofs = pte_index((pfn<<PAGE_SHIFT) + PAGE_OFFSET);
+ pte += pte_ofs;
+ for (; pte_ofs < PTRS_PER_PTE && pfn < end_pfn;
pte++, pfn++, pte_ofs++, addr += PAGE_SIZE) {
pgprot_t prot = PAGE_KERNEL;
+ /*
+ * first pass will use the same initial
+ * identity mapping attribute.
+ */
+ pgprot_t init_prot = __pgprot(PTE_IDENT_ATTR);
if (is_kernel_text(addr))
prot = PAGE_KERNEL_EXEC;
pages_4k++;
- set_pte(pte, pfn_pte(pfn, prot));
+ if (mapping_iter == 1)
+ set_pte(pte, pfn_pte(pfn, init_prot));
+ else
+ set_pte(pte, pfn_pte(pfn, prot));
}
- max_pfn_mapped = pfn;
}
}
- update_page_count(PG_LEVEL_2M, pages_2m);
- update_page_count(PG_LEVEL_4K, pages_4k);
+ if (mapping_iter == 1) {
+ /*
+ * update direct mapping page count only in the first
+ * iteration.
+ */
+ update_page_count(PG_LEVEL_2M, pages_2m);
+ update_page_count(PG_LEVEL_4K, pages_4k);
+
+ /*
+ * local global flush tlb, which will flush the previous
+ * mappings present in both small and large page TLB's.
+ */
+ __flush_tlb_all();
+
+ /*
+ * Second iteration will set the actual desired PTE attributes.
+ */
+ mapping_iter = 2;
+ goto repeat;
+ }
}
/*
{
if (pagenr <= 256)
return 1;
+ if (iomem_is_exclusive(pagenr << PAGE_SHIFT))
+ return 0;
if (!page_is_ram(pagenr))
return 1;
return 0;
}
-#ifdef CONFIG_HIGHMEM
pte_t *kmap_pte;
pgprot_t kmap_prot;
kmap_prot = PAGE_KERNEL;
}
+#ifdef CONFIG_HIGHMEM
static void __init permanent_kmaps_init(pgd_t *pgd_base)
{
unsigned long vaddr;
#endif /* !CONFIG_NUMA */
#else
-# define kmap_init() do { } while (0)
-# define permanent_kmaps_init(pgd_base) do { } while (0)
-# define set_highmem_pages_init() do { } while (0)
+static inline void permanent_kmaps_init(pgd_t *pgd_base)
+{
+}
+static inline void set_highmem_pages_init(void)
+{
+}
#endif /* CONFIG_HIGHMEM */
-pteval_t __PAGE_KERNEL = _PAGE_KERNEL;
-EXPORT_SYMBOL(__PAGE_KERNEL);
-
-pteval_t __PAGE_KERNEL_EXEC = _PAGE_KERNEL_EXEC;
-
void __init native_pagetable_setup_start(pgd_t *base)
{
unsigned long pfn, va;
* be partially populated, and so it avoids stomping on any existing
* mappings.
*/
-static void __init pagetable_init(void)
+static void __init early_ioremap_page_table_range_init(pgd_t *pgd_base)
{
- pgd_t *pgd_base = swapper_pg_dir;
unsigned long vaddr, end;
- paravirt_pagetable_setup_start(pgd_base);
-
- /* Enable PSE if available */
- if (cpu_has_pse)
- set_in_cr4(X86_CR4_PSE);
-
- /* Enable PGE if available */
- if (cpu_has_pge) {
- set_in_cr4(X86_CR4_PGE);
- __PAGE_KERNEL |= _PAGE_GLOBAL;
- __PAGE_KERNEL_EXEC |= _PAGE_GLOBAL;
- }
-
- kernel_physical_mapping_init(pgd_base);
- remap_numa_kva();
-
/*
* 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);
early_ioremap_reset();
+}
- permanent_kmaps_init(pgd_base);
+static void __init pagetable_init(void)
+{
+ pgd_t *pgd_base = swapper_pg_dir;
- paravirt_pagetable_setup_done(pgd_base);
+ permanent_kmaps_init(pgd_base);
}
#ifdef CONFIG_ACPI_SLEEP
int nx_enabled;
-pteval_t __supported_pte_mask __read_mostly = ~_PAGE_NX;
+pteval_t __supported_pte_mask __read_mostly = ~(_PAGE_NX | _PAGE_GLOBAL | _PAGE_IOMAP);
EXPORT_SYMBOL_GPL(__supported_pte_mask);
#ifdef CONFIG_X86_PAE
{
/* it could update max_pfn */
- /*
- * partially used pages are not usable - thus
- * we are rounding upwards:
- */
- min_low_pfn = PFN_UP(init_pg_tables_end);
+ /* max_low_pfn is 0, we already have early_res support */
max_low_pfn = max_pfn;
if (max_low_pfn > MAXMEM_PFN) {
if (max_pfn > max_low_pfn)
highstart_pfn = max_low_pfn;
memory_present(0, 0, highend_pfn);
+ e820_register_active_regions(0, 0, highend_pfn);
printk(KERN_NOTICE "%ldMB HIGHMEM available.\n",
pages_to_mb(highend_pfn - highstart_pfn));
num_physpages = highend_pfn;
high_memory = (void *) __va(highstart_pfn * PAGE_SIZE - 1) + 1;
#else
memory_present(0, 0, max_low_pfn);
+ e820_register_active_regions(0, 0, max_low_pfn);
num_physpages = max_low_pfn;
high_memory = (void *) __va(max_low_pfn * PAGE_SIZE - 1) + 1;
#endif
setup_bootmem_allocator();
}
+#endif /* !CONFIG_NEED_MULTIPLE_NODES */
-void __init zone_sizes_init(void)
+static void __init zone_sizes_init(void)
{
unsigned long max_zone_pfns[MAX_NR_ZONES];
memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
max_zone_pfns[ZONE_DMA] =
virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT;
max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
- remove_all_active_ranges();
#ifdef CONFIG_HIGHMEM
max_zone_pfns[ZONE_HIGHMEM] = highend_pfn;
- e820_register_active_regions(0, 0, highend_pfn);
-#else
- e820_register_active_regions(0, 0, max_low_pfn);
#endif
free_area_init_nodes(max_zone_pfns);
}
-#endif /* !CONFIG_NEED_MULTIPLE_NODES */
void __init setup_bootmem_allocator(void)
{
panic("Cannot find bootmem map of size %ld\n", bootmap_size);
reserve_early(bootmap, bootmap + bootmap_size, "BOOTMAP");
- bootmap_size = init_bootmem(bootmap >> PAGE_SHIFT, max_low_pfn);
+ /* don't touch min_low_pfn */
+ bootmap_size = init_bootmem_node(NODE_DATA(0), bootmap >> PAGE_SHIFT,
+ min_low_pfn, max_low_pfn);
printk(KERN_INFO " mapped low ram: 0 - %08lx\n",
max_pfn_mapped<<PAGE_SHIFT);
printk(KERN_INFO " low ram: %08lx - %08lx\n",
free_bootmem_with_active_regions(i, max_low_pfn);
early_res_to_bootmem(0, max_low_pfn<<PAGE_SHIFT);
+ after_init_bootmem = 1;
+}
+
+static void __init find_early_table_space(unsigned long end, int use_pse)
+{
+ unsigned long puds, pmds, ptes, tables, start;
+
+ puds = (end + PUD_SIZE - 1) >> PUD_SHIFT;
+ tables = PAGE_ALIGN(puds * sizeof(pud_t));
+
+ pmds = (end + PMD_SIZE - 1) >> PMD_SHIFT;
+ tables += PAGE_ALIGN(pmds * sizeof(pmd_t));
+
+ if (use_pse) {
+ unsigned long extra;
+
+ extra = end - ((end>>PMD_SHIFT) << PMD_SHIFT);
+ extra += PMD_SIZE;
+ ptes = (extra + PAGE_SIZE - 1) >> PAGE_SHIFT;
+ } else
+ ptes = (end + PAGE_SIZE - 1) >> PAGE_SHIFT;
+
+ tables += PAGE_ALIGN(ptes * sizeof(pte_t));
+
+ /* for fixmap */
+ tables += PAGE_ALIGN(__end_of_fixed_addresses * sizeof(pte_t));
+
+ /*
+ * RED-PEN putting page tables only on node 0 could
+ * cause a hotspot and fill up ZONE_DMA. The page tables
+ * need roughly 0.5KB per GB.
+ */
+ start = 0x7000;
+ table_start = find_e820_area(start, max_pfn_mapped<<PAGE_SHIFT,
+ tables, PAGE_SIZE);
+ if (table_start == -1UL)
+ panic("Cannot find space for the kernel page tables");
+
+ table_start >>= PAGE_SHIFT;
+ table_end = table_start;
+ table_top = table_start + (tables>>PAGE_SHIFT);
+
+ printk(KERN_DEBUG "kernel direct mapping tables up to %lx @ %lx-%lx\n",
+ end, table_start << PAGE_SHIFT,
+ (table_start << PAGE_SHIFT) + tables);
+}
+
+unsigned long __init_refok init_memory_mapping(unsigned long start,
+ unsigned long end)
+{
+ pgd_t *pgd_base = swapper_pg_dir;
+ unsigned long start_pfn, end_pfn;
+ unsigned long big_page_start;
+#ifdef CONFIG_DEBUG_PAGEALLOC
+ /*
+ * For CONFIG_DEBUG_PAGEALLOC, identity mapping will use small pages.
+ * This will simplify cpa(), which otherwise needs to support splitting
+ * large pages into small in interrupt context, etc.
+ */
+ int use_pse = 0;
+#else
+ int use_pse = cpu_has_pse;
+#endif
+
+ /*
+ * Find space for the kernel direct mapping tables.
+ */
+ if (!after_init_bootmem)
+ find_early_table_space(end, use_pse);
+
+#ifdef CONFIG_X86_PAE
+ set_nx();
+ if (nx_enabled)
+ printk(KERN_INFO "NX (Execute Disable) protection: active\n");
+#endif
+
+ /* Enable PSE if available */
+ if (cpu_has_pse)
+ set_in_cr4(X86_CR4_PSE);
+
+ /* Enable PGE if available */
+ if (cpu_has_pge) {
+ set_in_cr4(X86_CR4_PGE);
+ __supported_pte_mask |= _PAGE_GLOBAL;
+ }
+
+ /*
+ * Don't use a large page for the first 2/4MB of memory
+ * because there are often fixed size MTRRs in there
+ * and overlapping MTRRs into large pages can cause
+ * slowdowns.
+ */
+ big_page_start = PMD_SIZE;
+
+ if (start < big_page_start) {
+ start_pfn = start >> PAGE_SHIFT;
+ end_pfn = min(big_page_start>>PAGE_SHIFT, end>>PAGE_SHIFT);
+ } else {
+ /* head is not big page alignment ? */
+ start_pfn = start >> PAGE_SHIFT;
+ end_pfn = ((start + (PMD_SIZE - 1))>>PMD_SHIFT)
+ << (PMD_SHIFT - PAGE_SHIFT);
+ }
+ if (start_pfn < end_pfn)
+ kernel_physical_mapping_init(pgd_base, start_pfn, end_pfn, 0);
+
+ /* big page range */
+ start_pfn = ((start + (PMD_SIZE - 1))>>PMD_SHIFT)
+ << (PMD_SHIFT - PAGE_SHIFT);
+ if (start_pfn < (big_page_start >> PAGE_SHIFT))
+ start_pfn = big_page_start >> PAGE_SHIFT;
+ end_pfn = (end>>PMD_SHIFT) << (PMD_SHIFT - PAGE_SHIFT);
+ if (start_pfn < end_pfn)
+ kernel_physical_mapping_init(pgd_base, start_pfn, end_pfn,
+ use_pse);
+
+ /* tail is not big page alignment ? */
+ start_pfn = end_pfn;
+ if (start_pfn > (big_page_start>>PAGE_SHIFT)) {
+ end_pfn = end >> PAGE_SHIFT;
+ if (start_pfn < end_pfn)
+ kernel_physical_mapping_init(pgd_base, start_pfn,
+ end_pfn, 0);
+ }
+
+ early_ioremap_page_table_range_init(pgd_base);
+
+ load_cr3(swapper_pg_dir);
+
+ __flush_tlb_all();
+
+ if (!after_init_bootmem)
+ reserve_early(table_start << PAGE_SHIFT,
+ table_end << PAGE_SHIFT, "PGTABLE");
+
+ if (!after_init_bootmem)
+ early_memtest(start, end);
+
+ return end >> PAGE_SHIFT;
}
*/
void __init paging_init(void)
{
-#ifdef CONFIG_X86_PAE
- set_nx();
- if (nx_enabled)
- printk(KERN_INFO "NX (Execute Disable) protection: active\n");
-#endif
pagetable_init();
- load_cr3(swapper_pg_dir);
-
__flush_tlb_all();
kmap_init();
+
+ /*
+ * NOTE: at this point the bootmem allocator is fully available.
+ */
+ sparse_init();
+ zone_sizes_init();
}
/*
int codesize, reservedpages, datasize, initsize;
int tmp;
+ pci_iommu_alloc();
+
#ifdef CONFIG_FLATMEM
BUG_ON(!mem_map);
#endif
(unsigned long)&_text, (unsigned long)&_etext,
((unsigned long)&_etext - (unsigned long)&_text) >> 10);
+ /*
+ * Check boundaries twice: Some fundamental inconsistencies can
+ * be detected at build time already.
+ */
+#define __FIXADDR_TOP (-PAGE_SIZE)
+#ifdef CONFIG_HIGHMEM
+ BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP*PAGE_SIZE > FIXADDR_START);
+ BUILD_BUG_ON(VMALLOC_END > PKMAP_BASE);
+#endif
+#define high_memory (-128UL << 20)
+ BUILD_BUG_ON(VMALLOC_START >= VMALLOC_END);
+#undef high_memory
+#undef __FIXADDR_TOP
+
#ifdef CONFIG_HIGHMEM
BUG_ON(PKMAP_BASE + LAST_PKMAP*PAGE_SIZE > FIXADDR_START);
BUG_ON(VMALLOC_END > PKMAP_BASE);
#endif
- BUG_ON(VMALLOC_START > VMALLOC_END);
+ BUG_ON(VMALLOC_START >= VMALLOC_END);
BUG_ON((unsigned long)high_memory > VMALLOC_START);
if (boot_cpu_data.wp_works_ok < 0)
test_wp_bit();
- cpa_init();
save_pg_dir();
zap_low_mappings();
}
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
unsigned long start = PFN_ALIGN(_text);
unsigned long size = PFN_ALIGN(_etext) - start;
+#ifndef CONFIG_DYNAMIC_FTRACE
+ /* Dynamic tracing modifies the kernel text section */
set_pages_ro(virt_to_page(start), size >> PAGE_SHIFT);
printk(KERN_INFO "Write protecting the kernel text: %luk\n",
size >> 10);
printk(KERN_INFO "Testing CPA: write protecting again\n");
set_pages_ro(virt_to_page(start), size>>PAGE_SHIFT);
#endif
+#endif /* CONFIG_DYNAMIC_FTRACE */
+
start += size;
size = (unsigned long)__end_rodata - start;
set_pages_ro(virt_to_page(start), size >> PAGE_SHIFT);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff