[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) <peterz@xxxxxxxxxxxxx>
---
 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;
 	}