[PATCH v2 13/17] x86/mm: Force LDT desc accessed bit

[Peter Zijlstra]

In preparation to mapping the LDT RO, unconditionally set the accessed
bit.

Signed-off-by: Peter Zijlstra (Intel) <pet...@infradead.org>
---
 arch/x86/include/asm/desc.h |    5 +++++
 arch/x86/kernel/tls.c       |   11 ++---------
 2 files changed, 7 insertions(+), 9 deletions(-)

--- a/arch/x86/include/asm/desc.h
+++ b/arch/x86/include/asm/desc.h
@@ -20,6 +20,11 @@ static inline void fill_ldt(struct desc_
 
        desc->type              = (info->read_exec_only ^ 1) << 1;
        desc->type             |= info->contents << 2;
+       /*
+        * Always set the accessed bit so that the CPU
+        * doesn't try to write to the (read-only) GDT/LDT.
+        */
+       desc->type             |= 1;
 
        desc->s                 = 1;
        desc->dpl               = 0x3;
--- a/arch/x86/kernel/tls.c
+++ b/arch/x86/kernel/tls.c
@@ -93,17 +93,10 @@ static void set_tls_desc(struct task_str
        cpu = get_cpu();
 
        while (n-- > 0) {
-               if (LDT_empty(info) || LDT_zero(info)) {
+               if (LDT_empty(info) || LDT_zero(info))
                        memset(desc, 0, sizeof(*desc));
-               } else {
+               else
                        fill_ldt(desc, info);
-
-                       /*
-                        * Always set the accessed bit so that the CPU
-                        * doesn't try to write to the (read-only) GDT.
-                        */
-                       desc->type |= 1;
-               }
                ++info;
                ++desc;
        }