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authorH. Peter Anvin <hpa@linux.intel.com>2012-11-28 11:50:28 -0800
committerH. Peter Anvin <hpa@linux.intel.com>2012-11-29 13:23:03 -0800
commita5c2a893dbd4956a72fb261e8790d19f67b52c99 (patch)
tree08ec40c9885f90b67fcf9a272ba675ff815d23ff /arch/x86/lib
parent094ab1db7cb7833cd4c820acd868fc26acf3f08e (diff)
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x86, 386 removal: Remove CONFIG_X86_WP_WORKS_OK
All 486+ CPUs support WP in supervisor mode, so remove the fallback 386 support code. Signed-off-by: H. Peter Anvin <hpa@linux.intel.com> Link: http://lkml.kernel.org/r/1354132230-21854-7-git-send-email-hpa@linux.intel.com
Diffstat (limited to 'arch/x86/lib')
-rw-r--r--arch/x86/lib/usercopy_32.c57
1 files changed, 0 insertions, 57 deletions
diff --git a/arch/x86/lib/usercopy_32.c b/arch/x86/lib/usercopy_32.c
index 98f6d6b68f5..f0312d74640 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(&current->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(&current->mm->mmap_sem);
- congestion_wait(BLK_RW_ASYNC, HZ/50);
- goto survive;
- }
-
- if (retval != 1) {
- up_read(&current->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(&current->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);