Commit-ID: ff987fcf011d20c53b3a613edf6e2055ea48e26e Gitweb: https://git.kernel.org/tip/ff987fcf011d20c53b3a613edf6e2055ea48e26e Author: Scott Wood <sw...@redhat.com> AuthorDate: Thu, 24 May 2018 10:44:20 -0500 Committer: Thomas Gleixner <t...@linutronix.de> 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 <sw...@redhat.com> Signed-off-by: Borislav Petkov <b...@suse.de> Signed-off-by: Thomas Gleixner <t...@linutronix.de> Acked-by: Thomas Gleixner <t...@linutronix.de> Cc: Ashok Raj <ashok....@intel.com> Cc: Clark Williams <willi...@redhat.com> Cc: Pei Zhang <pezh...@redhat.com> Cc: x86-ml <x...@kernel.org> Link: http://lkml.kernel.org/r/20180524154420.24455-1-sw...@redhat.com --- 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) {
