Merge tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux

Pull arm64 fixes from Will Deacon:

 - Fix bogus KASAN splat on EFI runtime stack

 - Select JUMP_LABEL unconditionally to avoid boot failure with pKVM and
   the legacy implementation of static keys

 - Avoid touching GCS registers when 'arm64.nogcs' has been passed on
   the command-line

 - Move a 'cpumask_t' off the stack in smp_send_stop()

 - Don't advertise SME-related hwcaps to userspace when ID_AA64PFR1_EL1
   indicates that SME is not implemented

 - Always check the VMA when handling an Overlay fault

 - Avoid corrupting TCR2_EL1 during boot

* tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux:
  arm64/mm: Drop wrong writes into TCR2_EL1
  arm64: poe: Handle spurious Overlay faults
  arm64: Filter out SME hwcaps when FEAT_SME isn't implemented
  arm64: move smp_send_stop() cpu mask off stack
  arm64/gcs: Don't try to access GCS registers if arm64.nogcs is enabled
  arm64: Unconditionally select CONFIG_JUMP_LABEL
  arm64: efi: Fix KASAN false positive for EFI runtime stack

1 files changed, 5 insertions, 0 deletions

diff --git a/arch/arm64/kernel/process.c b/arch/arm64/kernel/process.c
index 5954cec19660..08b7042a2e2d 100644
--- a/arch/arm64/kernel/process.c
+++ b/arch/arm64/kernel/process.c
@@ -673,6 +673,11 @@ static void permission_overlay_switch(struct task_struct *next)
 	current->thread.por_el0 = read_sysreg_s(SYS_POR_EL0);
 	if (current->thread.por_el0 != next->thread.por_el0) {
 		write_sysreg_s(next->thread.por_el0, SYS_POR_EL0);
+		/*
+		 * No ISB required as we can tolerate spurious Overlay faults -
+		 * the fault handler will check again based on the new value
+		 * of POR_EL0.
+		 */
 	}
 }