Commit-ID: ff987fcf011d20c53b3a613edf6e2055ea48e26e
Gitweb: https://git.kernel.org/tip/ff987fcf011d20c53b3a613edf6e2055ea48e26e
Author: Scott Wood <swood@xxxxxxxxxx>
AuthorDate: Thu, 24 May 2018 10:44:20 -0500
Committer: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CommitDate: Sun, 27 May 2018 21:50:09 +0200
x86/microcode: Make the late update update_lock a raw lock for RT
__reload_late() is called from stop_machine context and thus cannot
acquire a non-raw spinlock on PREEMPT_RT.
Signed-off-by: Scott Wood <swood@xxxxxxxxxx>
Signed-off-by: Borislav Petkov <bp@xxxxxxx>
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Acked-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Ashok Raj <ashok.raj@xxxxxxxxx>
Cc: Clark Williams <williams@xxxxxxxxxx>
Cc: Pei Zhang <pezhang@xxxxxxxxxx>
Cc: x86-ml <x86@xxxxxxxxxx>
Link: http://lkml.kernel.org/r/20180524154420.24455-1-swood@xxxxxxxxxx
---
arch/x86/kernel/cpu/microcode/core.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/arch/x86/kernel/cpu/microcode/core.c b/arch/x86/kernel/cpu/microcode/core.c
index 77e201301528..08286269fd24 100644
--- a/arch/x86/kernel/cpu/microcode/core.c
+++ b/arch/x86/kernel/cpu/microcode/core.c
@@ -70,7 +70,7 @@ static DEFINE_MUTEX(microcode_mutex);
/*
* Serialize late loading so that CPUs get updated one-by-one.
*/
-static DEFINE_SPINLOCK(update_lock);
+static DEFINE_RAW_SPINLOCK(update_lock);
struct ucode_cpu_info ucode_cpu_info[NR_CPUS];
@@ -560,9 +560,9 @@ static int __reload_late(void *info)
if (__wait_for_cpus(&late_cpus_in, NSEC_PER_SEC))
return -1;
- spin_lock(&update_lock);
+ raw_spin_lock(&update_lock);
apply_microcode_local(&err);
- spin_unlock(&update_lock);
+ raw_spin_unlock(&update_lock);
/* siblings return UCODE_OK because their engine got updated already */
if (err > UCODE_NFOUND) {
--
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