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;
}
--
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