11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * Copyright (C) 2000 - 2003 Jeff Dike (jdike@addtoit.com) 31da177e4SLinus Torvalds * Licensed under the GPL 41da177e4SLinus Torvalds */ 51da177e4SLinus Torvalds 61da177e4SLinus Torvalds #include "linux/stddef.h" 71da177e4SLinus Torvalds #include "linux/kernel.h" 81da177e4SLinus Torvalds #include "linux/mm.h" 91da177e4SLinus Torvalds #include "linux/bootmem.h" 101da177e4SLinus Torvalds #include "linux/swap.h" 111da177e4SLinus Torvalds #include "linux/highmem.h" 121da177e4SLinus Torvalds #include "linux/gfp.h" 131da177e4SLinus Torvalds #include "asm/page.h" 141da177e4SLinus Torvalds #include "asm/fixmap.h" 151da177e4SLinus Torvalds #include "asm/pgalloc.h" 161da177e4SLinus Torvalds #include "user_util.h" 171da177e4SLinus Torvalds #include "kern_util.h" 181da177e4SLinus Torvalds #include "kern.h" 191da177e4SLinus Torvalds #include "mem_user.h" 201da177e4SLinus Torvalds #include "uml_uaccess.h" 211da177e4SLinus Torvalds #include "os.h" 221da177e4SLinus Torvalds 231da177e4SLinus Torvalds extern char __binary_start; 241da177e4SLinus Torvalds 251da177e4SLinus Torvalds /* Changed during early boot */ 261da177e4SLinus Torvalds unsigned long *empty_zero_page = NULL; 271da177e4SLinus Torvalds unsigned long *empty_bad_page = NULL; 281da177e4SLinus Torvalds pgd_t swapper_pg_dir[PTRS_PER_PGD]; 291da177e4SLinus Torvalds unsigned long highmem; 301da177e4SLinus Torvalds int kmalloc_ok = 0; 311da177e4SLinus Torvalds 321da177e4SLinus Torvalds static unsigned long brk_end; 331da177e4SLinus Torvalds 341da177e4SLinus Torvalds void unmap_physmem(void) 351da177e4SLinus Torvalds { 361da177e4SLinus Torvalds os_unmap_memory((void *) brk_end, uml_reserved - brk_end); 371da177e4SLinus Torvalds } 381da177e4SLinus Torvalds 391da177e4SLinus Torvalds static void map_cb(void *unused) 401da177e4SLinus Torvalds { 411da177e4SLinus Torvalds map_memory(brk_end, __pa(brk_end), uml_reserved - brk_end, 1, 1, 0); 421da177e4SLinus Torvalds } 431da177e4SLinus Torvalds 441da177e4SLinus Torvalds #ifdef CONFIG_HIGHMEM 451da177e4SLinus Torvalds static void setup_highmem(unsigned long highmem_start, 461da177e4SLinus Torvalds unsigned long highmem_len) 471da177e4SLinus Torvalds { 481da177e4SLinus Torvalds struct page *page; 491da177e4SLinus Torvalds unsigned long highmem_pfn; 501da177e4SLinus Torvalds int i; 511da177e4SLinus Torvalds 521da177e4SLinus Torvalds highmem_pfn = __pa(highmem_start) >> PAGE_SHIFT; 531da177e4SLinus Torvalds for(i = 0; i < highmem_len >> PAGE_SHIFT; i++){ 541da177e4SLinus Torvalds page = &mem_map[highmem_pfn + i]; 551da177e4SLinus Torvalds ClearPageReserved(page); 561da177e4SLinus Torvalds set_page_count(page, 1); 571da177e4SLinus Torvalds __free_page(page); 581da177e4SLinus Torvalds } 591da177e4SLinus Torvalds } 601da177e4SLinus Torvalds #endif 611da177e4SLinus Torvalds 621da177e4SLinus Torvalds void mem_init(void) 631da177e4SLinus Torvalds { 641da177e4SLinus Torvalds unsigned long start; 651da177e4SLinus Torvalds 661da177e4SLinus Torvalds max_low_pfn = (high_physmem - uml_physmem) >> PAGE_SHIFT; 671da177e4SLinus Torvalds 681da177e4SLinus Torvalds /* clear the zero-page */ 691da177e4SLinus Torvalds memset((void *) empty_zero_page, 0, PAGE_SIZE); 701da177e4SLinus Torvalds 711da177e4SLinus Torvalds /* Map in the area just after the brk now that kmalloc is about 721da177e4SLinus Torvalds * to be turned on. 731da177e4SLinus Torvalds */ 741da177e4SLinus Torvalds brk_end = (unsigned long) UML_ROUND_UP(sbrk(0)); 751da177e4SLinus Torvalds map_cb(NULL); 761da177e4SLinus Torvalds initial_thread_cb(map_cb, NULL); 771da177e4SLinus Torvalds free_bootmem(__pa(brk_end), uml_reserved - brk_end); 781da177e4SLinus Torvalds uml_reserved = brk_end; 791da177e4SLinus Torvalds 801da177e4SLinus Torvalds /* Fill in any hole at the start of the binary */ 811da177e4SLinus Torvalds start = (unsigned long) &__binary_start & PAGE_MASK; 821da177e4SLinus Torvalds if(uml_physmem != start){ 831da177e4SLinus Torvalds map_memory(uml_physmem, __pa(uml_physmem), start - uml_physmem, 841da177e4SLinus Torvalds 1, 1, 0); 851da177e4SLinus Torvalds } 861da177e4SLinus Torvalds 871da177e4SLinus Torvalds /* this will put all low memory onto the freelists */ 881da177e4SLinus Torvalds totalram_pages = free_all_bootmem(); 891da177e4SLinus Torvalds totalhigh_pages = highmem >> PAGE_SHIFT; 901da177e4SLinus Torvalds totalram_pages += totalhigh_pages; 911da177e4SLinus Torvalds num_physpages = totalram_pages; 921da177e4SLinus Torvalds max_pfn = totalram_pages; 931da177e4SLinus Torvalds printk(KERN_INFO "Memory: %luk available\n", 941da177e4SLinus Torvalds (unsigned long) nr_free_pages() << (PAGE_SHIFT-10)); 951da177e4SLinus Torvalds kmalloc_ok = 1; 961da177e4SLinus Torvalds 971da177e4SLinus Torvalds #ifdef CONFIG_HIGHMEM 981da177e4SLinus Torvalds setup_highmem(end_iomem, highmem); 991da177e4SLinus Torvalds #endif 1001da177e4SLinus Torvalds } 1011da177e4SLinus Torvalds 10212f49643SJeff Dike /* 10312f49643SJeff Dike * Create a page table and place a pointer to it in a middle page 10412f49643SJeff Dike * directory entry. 10512f49643SJeff Dike */ 10612f49643SJeff Dike static void __init one_page_table_init(pmd_t *pmd) 10712f49643SJeff Dike { 10812f49643SJeff Dike if (pmd_none(*pmd)) { 10912f49643SJeff Dike pte_t *pte = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE); 11012f49643SJeff Dike set_pmd(pmd, __pmd(_KERNPG_TABLE + 11112f49643SJeff Dike (unsigned long) __pa(pte))); 11212f49643SJeff Dike if (pte != pte_offset_kernel(pmd, 0)) 11312f49643SJeff Dike BUG(); 11412f49643SJeff Dike } 11512f49643SJeff Dike } 11612f49643SJeff Dike 11712f49643SJeff Dike static void __init one_md_table_init(pud_t *pud) 11812f49643SJeff Dike { 11912f49643SJeff Dike #ifdef CONFIG_3_LEVEL_PGTABLES 12012f49643SJeff Dike pmd_t *pmd_table = (pmd_t *) alloc_bootmem_low_pages(PAGE_SIZE); 12112f49643SJeff Dike set_pud(pud, __pud(_KERNPG_TABLE + (unsigned long) __pa(pmd_table))); 12212f49643SJeff Dike if (pmd_table != pmd_offset(pud, 0)) 12312f49643SJeff Dike BUG(); 12412f49643SJeff Dike #endif 12512f49643SJeff Dike } 12612f49643SJeff Dike 1271da177e4SLinus Torvalds static void __init fixrange_init(unsigned long start, unsigned long end, 1281da177e4SLinus Torvalds pgd_t *pgd_base) 1291da177e4SLinus Torvalds { 1301da177e4SLinus Torvalds pgd_t *pgd; 13112f49643SJeff Dike pud_t *pud; 1321da177e4SLinus Torvalds pmd_t *pmd; 1331da177e4SLinus Torvalds int i, j; 1341da177e4SLinus Torvalds unsigned long vaddr; 1351da177e4SLinus Torvalds 1361da177e4SLinus Torvalds vaddr = start; 1371da177e4SLinus Torvalds i = pgd_index(vaddr); 1381da177e4SLinus Torvalds j = pmd_index(vaddr); 1391da177e4SLinus Torvalds pgd = pgd_base + i; 1401da177e4SLinus Torvalds 1411da177e4SLinus Torvalds for ( ; (i < PTRS_PER_PGD) && (vaddr < end); pgd++, i++) { 14212f49643SJeff Dike pud = pud_offset(pgd, vaddr); 14312f49643SJeff Dike if (pud_none(*pud)) 14412f49643SJeff Dike one_md_table_init(pud); 14512f49643SJeff Dike pmd = pmd_offset(pud, vaddr); 1461da177e4SLinus Torvalds for (; (j < PTRS_PER_PMD) && (vaddr != end); pmd++, j++) { 14712f49643SJeff Dike one_page_table_init(pmd); 1481da177e4SLinus Torvalds vaddr += PMD_SIZE; 1491da177e4SLinus Torvalds } 1501da177e4SLinus Torvalds j = 0; 1511da177e4SLinus Torvalds } 1521da177e4SLinus Torvalds } 1531da177e4SLinus Torvalds 1541da177e4SLinus Torvalds #ifdef CONFIG_HIGHMEM 1551da177e4SLinus Torvalds pte_t *kmap_pte; 1561da177e4SLinus Torvalds pgprot_t kmap_prot; 1571da177e4SLinus Torvalds 1581da177e4SLinus Torvalds #define kmap_get_fixmap_pte(vaddr) \ 1591da177e4SLinus Torvalds pte_offset_kernel(pmd_offset(pud_offset(pgd_offset_k(vaddr), (vaddr)),\ 1601da177e4SLinus Torvalds (vaddr)), (vaddr)) 1611da177e4SLinus Torvalds 1621da177e4SLinus Torvalds static void __init kmap_init(void) 1631da177e4SLinus Torvalds { 1641da177e4SLinus Torvalds unsigned long kmap_vstart; 1651da177e4SLinus Torvalds 1661da177e4SLinus Torvalds /* cache the first kmap pte */ 1671da177e4SLinus Torvalds kmap_vstart = __fix_to_virt(FIX_KMAP_BEGIN); 1681da177e4SLinus Torvalds kmap_pte = kmap_get_fixmap_pte(kmap_vstart); 1691da177e4SLinus Torvalds 1701da177e4SLinus Torvalds kmap_prot = PAGE_KERNEL; 1711da177e4SLinus Torvalds } 1721da177e4SLinus Torvalds 1731da177e4SLinus Torvalds static void init_highmem(void) 1741da177e4SLinus Torvalds { 1751da177e4SLinus Torvalds pgd_t *pgd; 1761da177e4SLinus Torvalds pud_t *pud; 1771da177e4SLinus Torvalds pmd_t *pmd; 1781da177e4SLinus Torvalds pte_t *pte; 1791da177e4SLinus Torvalds unsigned long vaddr; 1801da177e4SLinus Torvalds 1811da177e4SLinus Torvalds /* 1821da177e4SLinus Torvalds * Permanent kmaps: 1831da177e4SLinus Torvalds */ 1841da177e4SLinus Torvalds vaddr = PKMAP_BASE; 1851da177e4SLinus Torvalds fixrange_init(vaddr, vaddr + PAGE_SIZE*LAST_PKMAP, swapper_pg_dir); 1861da177e4SLinus Torvalds 1871da177e4SLinus Torvalds pgd = swapper_pg_dir + pgd_index(vaddr); 1881da177e4SLinus Torvalds pud = pud_offset(pgd, vaddr); 1891da177e4SLinus Torvalds pmd = pmd_offset(pud, vaddr); 1901da177e4SLinus Torvalds pte = pte_offset_kernel(pmd, vaddr); 1911da177e4SLinus Torvalds pkmap_page_table = pte; 1921da177e4SLinus Torvalds 1931da177e4SLinus Torvalds kmap_init(); 1941da177e4SLinus Torvalds } 1951da177e4SLinus Torvalds #endif /* CONFIG_HIGHMEM */ 1961da177e4SLinus Torvalds 1971da177e4SLinus Torvalds static void __init fixaddr_user_init( void) 1981da177e4SLinus Torvalds { 1999a0b3869Sviro@ZenIV.linux.org.uk #ifdef CONFIG_ARCH_REUSE_HOST_VSYSCALL_AREA 2001da177e4SLinus Torvalds long size = FIXADDR_USER_END - FIXADDR_USER_START; 2011da177e4SLinus Torvalds pgd_t *pgd; 2021da177e4SLinus Torvalds pud_t *pud; 2031da177e4SLinus Torvalds pmd_t *pmd; 2041da177e4SLinus Torvalds pte_t *pte; 2051da177e4SLinus Torvalds unsigned long paddr, vaddr = FIXADDR_USER_START; 2061da177e4SLinus Torvalds 2071da177e4SLinus Torvalds if ( ! size ) 2081da177e4SLinus Torvalds return; 2091da177e4SLinus Torvalds 2101da177e4SLinus Torvalds fixrange_init( FIXADDR_USER_START, FIXADDR_USER_END, swapper_pg_dir); 2111da177e4SLinus Torvalds paddr = (unsigned long)alloc_bootmem_low_pages( size); 2121da177e4SLinus Torvalds memcpy( (void *)paddr, (void *)FIXADDR_USER_START, size); 2131da177e4SLinus Torvalds paddr = __pa(paddr); 2141da177e4SLinus Torvalds for ( ; size > 0; size-=PAGE_SIZE, vaddr+=PAGE_SIZE, paddr+=PAGE_SIZE){ 2151da177e4SLinus Torvalds pgd = swapper_pg_dir + pgd_index(vaddr); 2161da177e4SLinus Torvalds pud = pud_offset(pgd, vaddr); 2171da177e4SLinus Torvalds pmd = pmd_offset(pud, vaddr); 2181da177e4SLinus Torvalds pte = pte_offset_kernel(pmd, vaddr); 2191da177e4SLinus Torvalds pte_set_val( (*pte), paddr, PAGE_READONLY); 2201da177e4SLinus Torvalds } 2211da177e4SLinus Torvalds #endif 2221da177e4SLinus Torvalds } 2231da177e4SLinus Torvalds 2241da177e4SLinus Torvalds void paging_init(void) 2251da177e4SLinus Torvalds { 2261da177e4SLinus Torvalds unsigned long zones_size[MAX_NR_ZONES], vaddr; 2271da177e4SLinus Torvalds int i; 2281da177e4SLinus Torvalds 2291da177e4SLinus Torvalds empty_zero_page = (unsigned long *) alloc_bootmem_low_pages(PAGE_SIZE); 2301da177e4SLinus Torvalds empty_bad_page = (unsigned long *) alloc_bootmem_low_pages(PAGE_SIZE); 2311da177e4SLinus Torvalds for(i=0;i<sizeof(zones_size)/sizeof(zones_size[0]);i++) 2321da177e4SLinus Torvalds zones_size[i] = 0; 2331da177e4SLinus Torvalds zones_size[0] = (end_iomem >> PAGE_SHIFT) - (uml_physmem >> PAGE_SHIFT); 2341da177e4SLinus Torvalds zones_size[2] = highmem >> PAGE_SHIFT; 2351da177e4SLinus Torvalds free_area_init(zones_size); 2361da177e4SLinus Torvalds 2371da177e4SLinus Torvalds /* 2381da177e4SLinus Torvalds * Fixed mappings, only the page table structure has to be 2391da177e4SLinus Torvalds * created - mappings will be set by set_fixmap(): 2401da177e4SLinus Torvalds */ 2411da177e4SLinus Torvalds vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK; 2421da177e4SLinus Torvalds fixrange_init(vaddr, FIXADDR_TOP, swapper_pg_dir); 2431da177e4SLinus Torvalds 2441da177e4SLinus Torvalds fixaddr_user_init(); 2451da177e4SLinus Torvalds 2461da177e4SLinus Torvalds #ifdef CONFIG_HIGHMEM 2471da177e4SLinus Torvalds init_highmem(); 2481da177e4SLinus Torvalds #endif 2491da177e4SLinus Torvalds } 2501da177e4SLinus Torvalds 2511da177e4SLinus Torvalds struct page *arch_validate(struct page *page, int mask, int order) 2521da177e4SLinus Torvalds { 2531da177e4SLinus Torvalds unsigned long addr, zero = 0; 2541da177e4SLinus Torvalds int i; 2551da177e4SLinus Torvalds 2561da177e4SLinus Torvalds again: 2571da177e4SLinus Torvalds if(page == NULL) return(page); 2581da177e4SLinus Torvalds if(PageHighMem(page)) return(page); 2591da177e4SLinus Torvalds 2601da177e4SLinus Torvalds addr = (unsigned long) page_address(page); 2611da177e4SLinus Torvalds for(i = 0; i < (1 << order); i++){ 2621da177e4SLinus Torvalds current->thread.fault_addr = (void *) addr; 2631da177e4SLinus Torvalds if(__do_copy_to_user((void __user *) addr, &zero, 2641da177e4SLinus Torvalds sizeof(zero), 2651da177e4SLinus Torvalds ¤t->thread.fault_addr, 2661da177e4SLinus Torvalds ¤t->thread.fault_catcher)){ 2671da177e4SLinus Torvalds if(!(mask & __GFP_WAIT)) return(NULL); 2681da177e4SLinus Torvalds else break; 2691da177e4SLinus Torvalds } 2701da177e4SLinus Torvalds addr += PAGE_SIZE; 2711da177e4SLinus Torvalds } 2721da177e4SLinus Torvalds 2731da177e4SLinus Torvalds if(i == (1 << order)) return(page); 2741da177e4SLinus Torvalds page = alloc_pages(mask, order); 2751da177e4SLinus Torvalds goto again; 2761da177e4SLinus Torvalds } 2771da177e4SLinus Torvalds 2781da177e4SLinus Torvalds /* This can't do anything because nothing in the kernel image can be freed 2791da177e4SLinus Torvalds * since it's not in kernel physical memory. 2801da177e4SLinus Torvalds */ 2811da177e4SLinus Torvalds 2821da177e4SLinus Torvalds void free_initmem(void) 2831da177e4SLinus Torvalds { 2841da177e4SLinus Torvalds } 2851da177e4SLinus Torvalds 2861da177e4SLinus Torvalds #ifdef CONFIG_BLK_DEV_INITRD 2871da177e4SLinus Torvalds 2881da177e4SLinus Torvalds void free_initrd_mem(unsigned long start, unsigned long end) 2891da177e4SLinus Torvalds { 2901da177e4SLinus Torvalds if (start < end) 2911da177e4SLinus Torvalds printk ("Freeing initrd memory: %ldk freed\n", 2921da177e4SLinus Torvalds (end - start) >> 10); 2931da177e4SLinus Torvalds for (; start < end; start += PAGE_SIZE) { 2941da177e4SLinus Torvalds ClearPageReserved(virt_to_page(start)); 2951da177e4SLinus Torvalds set_page_count(virt_to_page(start), 1); 2961da177e4SLinus Torvalds free_page(start); 2971da177e4SLinus Torvalds totalram_pages++; 2981da177e4SLinus Torvalds } 2991da177e4SLinus Torvalds } 3001da177e4SLinus Torvalds 3011da177e4SLinus Torvalds #endif 3021da177e4SLinus Torvalds 3031da177e4SLinus Torvalds void show_mem(void) 3041da177e4SLinus Torvalds { 3051da177e4SLinus Torvalds int pfn, total = 0, reserved = 0; 3061da177e4SLinus Torvalds int shared = 0, cached = 0; 3071da177e4SLinus Torvalds int highmem = 0; 3081da177e4SLinus Torvalds struct page *page; 3091da177e4SLinus Torvalds 3101da177e4SLinus Torvalds printk("Mem-info:\n"); 3111da177e4SLinus Torvalds show_free_areas(); 3121da177e4SLinus Torvalds printk("Free swap: %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10)); 3131da177e4SLinus Torvalds pfn = max_mapnr; 3141da177e4SLinus Torvalds while(pfn-- > 0) { 3151da177e4SLinus Torvalds page = pfn_to_page(pfn); 3161da177e4SLinus Torvalds total++; 3171da177e4SLinus Torvalds if(PageHighMem(page)) 3181da177e4SLinus Torvalds highmem++; 3191da177e4SLinus Torvalds if(PageReserved(page)) 3201da177e4SLinus Torvalds reserved++; 3211da177e4SLinus Torvalds else if(PageSwapCache(page)) 3221da177e4SLinus Torvalds cached++; 3231da177e4SLinus Torvalds else if(page_count(page)) 3241da177e4SLinus Torvalds shared += page_count(page) - 1; 3251da177e4SLinus Torvalds } 3261da177e4SLinus Torvalds printk("%d pages of RAM\n", total); 3271da177e4SLinus Torvalds printk("%d pages of HIGHMEM\n", highmem); 3281da177e4SLinus Torvalds printk("%d reserved pages\n", reserved); 3291da177e4SLinus Torvalds printk("%d pages shared\n", shared); 3301da177e4SLinus Torvalds printk("%d pages swap cached\n", cached); 3311da177e4SLinus Torvalds } 3321da177e4SLinus Torvalds 3331da177e4SLinus Torvalds /* 3341da177e4SLinus Torvalds * Allocate and free page tables. 3351da177e4SLinus Torvalds */ 3361da177e4SLinus Torvalds 3371da177e4SLinus Torvalds pgd_t *pgd_alloc(struct mm_struct *mm) 3381da177e4SLinus Torvalds { 3391da177e4SLinus Torvalds pgd_t *pgd = (pgd_t *)__get_free_page(GFP_KERNEL); 3401da177e4SLinus Torvalds 3411da177e4SLinus Torvalds if (pgd) { 3421da177e4SLinus Torvalds memset(pgd, 0, USER_PTRS_PER_PGD * sizeof(pgd_t)); 3431da177e4SLinus Torvalds memcpy(pgd + USER_PTRS_PER_PGD, 3441da177e4SLinus Torvalds swapper_pg_dir + USER_PTRS_PER_PGD, 3451da177e4SLinus Torvalds (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t)); 3461da177e4SLinus Torvalds } 3471da177e4SLinus Torvalds return pgd; 3481da177e4SLinus Torvalds } 3491da177e4SLinus Torvalds 3501da177e4SLinus Torvalds void pgd_free(pgd_t *pgd) 3511da177e4SLinus Torvalds { 3521da177e4SLinus Torvalds free_page((unsigned long) pgd); 3531da177e4SLinus Torvalds } 3541da177e4SLinus Torvalds 3551da177e4SLinus Torvalds pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address) 3561da177e4SLinus Torvalds { 3571da177e4SLinus Torvalds pte_t *pte; 3581da177e4SLinus Torvalds 3591da177e4SLinus Torvalds pte = (pte_t *)__get_free_page(GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO); 3601da177e4SLinus Torvalds return pte; 3611da177e4SLinus Torvalds } 3621da177e4SLinus Torvalds 3631da177e4SLinus Torvalds struct page *pte_alloc_one(struct mm_struct *mm, unsigned long address) 3641da177e4SLinus Torvalds { 3651da177e4SLinus Torvalds struct page *pte; 3661da177e4SLinus Torvalds 3671da177e4SLinus Torvalds pte = alloc_page(GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO); 3681da177e4SLinus Torvalds return pte; 3691da177e4SLinus Torvalds } 3701da177e4SLinus Torvalds 3711da177e4SLinus Torvalds /* 3721da177e4SLinus Torvalds * Overrides for Emacs so that we follow Linus's tabbing style. 3731da177e4SLinus Torvalds * Emacs will notice this stuff at the end of the file and automatically 3741da177e4SLinus Torvalds * adjust the settings for this buffer only. This must remain at the end 3751da177e4SLinus Torvalds * of the file. 3761da177e4SLinus Torvalds * --------------------------------------------------------------------------- 3771da177e4SLinus Torvalds * Local variables: 3781da177e4SLinus Torvalds * c-file-style: "linux" 3791da177e4SLinus Torvalds * End: 3801da177e4SLinus Torvalds */ 381