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-rw-r--r--arch/x86/kernel/cpu/mtrr/main.c20
1 files changed, 15 insertions, 5 deletions
diff --git a/arch/x86/kernel/cpu/mtrr/main.c b/arch/x86/kernel/cpu/mtrr/main.c
index 307dfbbf4a8e..929739a653d1 100644
--- a/arch/x86/kernel/cpu/mtrr/main.c
+++ b/arch/x86/kernel/cpu/mtrr/main.c
@@ -293,14 +293,24 @@ set_mtrr(unsigned int reg, unsigned long base, unsigned long size, mtrr_type typ
/*
* HACK!
- * We use this same function to initialize the mtrrs on boot.
- * The state of the boot cpu's mtrrs has been saved, and we want
- * to replicate across all the APs.
- * If we're doing that @reg is set to something special...
+ *
+ * We use this same function to initialize the mtrrs during boot,
+ * resume, runtime cpu online and on an explicit request to set a
+ * specific MTRR.
+ *
+ * During boot or suspend, the state of the boot cpu's mtrrs has been
+ * saved, and we want to replicate that across all the cpus that come
+ * online (either at the end of boot or resume or during a runtime cpu
+ * online). If we're doing that, @reg is set to something special and on
+ * this cpu we still do mtrr_if->set_all(). During boot/resume, this
+ * is unnecessary if at this point we are still on the cpu that started
+ * the boot/resume sequence. But there is no guarantee that we are still
+ * on the same cpu. So we do mtrr_if->set_all() on this cpu aswell to be
+ * sure that we are in sync with everyone else.
*/
if (reg != ~0U)
mtrr_if->set(reg, base, size, type);
- else if (!mtrr_aps_delayed_init)
+ else
mtrr_if->set_all();
/* Wait for the others */