With the removal of the vDSO passthrough from the host, FIXADDR_USER_START is always 0 and fixaddr_user_init() is dead code.
Remove it. Signed-off-by: Thomas Weißschuh <[email protected]> --- arch/um/kernel/mem.c | 107 --------------------------------------------------- 1 file changed, 107 deletions(-) diff --git a/arch/um/kernel/mem.c b/arch/um/kernel/mem.c index dc938715ec9d..39c4a7e21c6f 100644 --- a/arch/um/kernel/mem.c +++ b/arch/um/kernel/mem.c @@ -84,109 +84,6 @@ void __init mem_init(void) kmalloc_ok = 1; } -#if IS_ENABLED(CONFIG_ARCH_REUSE_HOST_VSYSCALL_AREA) -/* - * Create a page table and place a pointer to it in a middle page - * directory entry. - */ -static void __init one_page_table_init(pmd_t *pmd) -{ - if (pmd_none(*pmd)) { - pte_t *pte = (pte_t *) memblock_alloc_low(PAGE_SIZE, - PAGE_SIZE); - if (!pte) - panic("%s: Failed to allocate %lu bytes align=%lx\n", - __func__, PAGE_SIZE, PAGE_SIZE); - - set_pmd(pmd, __pmd(_KERNPG_TABLE + - (unsigned long) __pa(pte))); - BUG_ON(pte != pte_offset_kernel(pmd, 0)); - } -} - -static void __init one_md_table_init(pud_t *pud) -{ -#if CONFIG_PGTABLE_LEVELS > 2 - pmd_t *pmd_table = (pmd_t *) memblock_alloc_low(PAGE_SIZE, PAGE_SIZE); - if (!pmd_table) - panic("%s: Failed to allocate %lu bytes align=%lx\n", - __func__, PAGE_SIZE, PAGE_SIZE); - - set_pud(pud, __pud(_KERNPG_TABLE + (unsigned long) __pa(pmd_table))); - BUG_ON(pmd_table != pmd_offset(pud, 0)); -#endif -} - -static void __init one_ud_table_init(p4d_t *p4d) -{ -#if CONFIG_PGTABLE_LEVELS > 3 - pud_t *pud_table = (pud_t *) memblock_alloc_low(PAGE_SIZE, PAGE_SIZE); - if (!pud_table) - panic("%s: Failed to allocate %lu bytes align=%lx\n", - __func__, PAGE_SIZE, PAGE_SIZE); - - set_p4d(p4d, __p4d(_KERNPG_TABLE + (unsigned long) __pa(pud_table))); - BUG_ON(pud_table != pud_offset(p4d, 0)); -#endif -} - -static void __init fixrange_init(unsigned long start, unsigned long end, - pgd_t *pgd_base) -{ - pgd_t *pgd; - p4d_t *p4d; - pud_t *pud; - pmd_t *pmd; - int i, j; - unsigned long vaddr; - - vaddr = start; - i = pgd_index(vaddr); - j = pmd_index(vaddr); - pgd = pgd_base + i; - - for ( ; (i < PTRS_PER_PGD) && (vaddr < end); pgd++, i++) { - p4d = p4d_offset(pgd, vaddr); - if (p4d_none(*p4d)) - one_ud_table_init(p4d); - pud = pud_offset(p4d, vaddr); - if (pud_none(*pud)) - one_md_table_init(pud); - pmd = pmd_offset(pud, vaddr); - for (; (j < PTRS_PER_PMD) && (vaddr < end); pmd++, j++) { - one_page_table_init(pmd); - vaddr += PMD_SIZE; - } - j = 0; - } -} - -static void __init fixaddr_user_init( void) -{ - long size = FIXADDR_USER_END - FIXADDR_USER_START; - pte_t *pte; - phys_t p; - unsigned long v, vaddr = FIXADDR_USER_START; - - if (!size) - return; - - fixrange_init( FIXADDR_USER_START, FIXADDR_USER_END, swapper_pg_dir); - v = (unsigned long) memblock_alloc_low(size, PAGE_SIZE); - if (!v) - panic("%s: Failed to allocate %lu bytes align=%lx\n", - __func__, size, PAGE_SIZE); - - memcpy((void *) v , (void *) FIXADDR_USER_START, size); - p = __pa(v); - for ( ; size > 0; size -= PAGE_SIZE, vaddr += PAGE_SIZE, - p += PAGE_SIZE) { - pte = virt_to_kpte(vaddr); - pte_set_val(*pte, p, PAGE_READONLY); - } -} -#endif - void __init paging_init(void) { unsigned long max_zone_pfn[MAX_NR_ZONES] = { 0 }; @@ -199,10 +96,6 @@ void __init paging_init(void) max_zone_pfn[ZONE_NORMAL] = high_physmem >> PAGE_SHIFT; free_area_init(max_zone_pfn); - -#if IS_ENABLED(CONFIG_ARCH_REUSE_HOST_VSYSCALL_AREA) - fixaddr_user_init(); -#endif } /* -- 2.51.1.dirty
