diff options
Diffstat (limited to 'arch/x86/lib/usercopy_32.c')
| -rw-r--r-- | arch/x86/lib/usercopy_32.c | 57 |
1 files changed, 0 insertions, 57 deletions
diff --git a/arch/x86/lib/usercopy_32.c b/arch/x86/lib/usercopy_32.c index 98f6d6b68f5a..f0312d746402 100644 --- a/arch/x86/lib/usercopy_32.c +++ b/arch/x86/lib/usercopy_32.c @@ -570,63 +570,6 @@ do { \ unsigned long __copy_to_user_ll(void __user *to, const void *from, unsigned long n) { -#ifndef CONFIG_X86_WP_WORKS_OK - if (unlikely(boot_cpu_data.wp_works_ok == 0) && - ((unsigned long)to) < TASK_SIZE) { - /* - * When we are in an atomic section (see - * mm/filemap.c:file_read_actor), return the full - * length to take the slow path. - */ - if (in_atomic()) - return n; - - /* - * CPU does not honor the WP bit when writing - * from supervisory mode, and due to preemption or SMP, - * the page tables can change at any time. - * Do it manually. Manfred <manfred@colorfullife.com> - */ - while (n) { - unsigned long offset = ((unsigned long)to)%PAGE_SIZE; - unsigned long len = PAGE_SIZE - offset; - int retval; - struct page *pg; - void *maddr; - - if (len > n) - len = n; - -survive: - down_read(¤t->mm->mmap_sem); - retval = get_user_pages(current, current->mm, - (unsigned long)to, 1, 1, 0, &pg, NULL); - - if (retval == -ENOMEM && is_global_init(current)) { - up_read(¤t->mm->mmap_sem); - congestion_wait(BLK_RW_ASYNC, HZ/50); - goto survive; - } - - if (retval != 1) { - up_read(¤t->mm->mmap_sem); - break; - } - - maddr = kmap_atomic(pg); - memcpy(maddr + offset, from, len); - kunmap_atomic(maddr); - set_page_dirty_lock(pg); - put_page(pg); - up_read(¤t->mm->mmap_sem); - - from += len; - to += len; - n -= len; - } - return n; - } -#endif stac(); if (movsl_is_ok(to, from, n)) __copy_user(to, from, n); |