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

Pull arm64 updates from Catalin Marinas:
 "Notable features are user-space support for the memcpy/memset
  instructions and the permission indirection extension.

   - Support for the Armv8.9 Permission Indirection Extensions. While
     this feature doesn't add new functionality, it enables future
     support for Guarded Control Stacks (GCS) and Permission Overlays

   - User-space support for the Armv8.8 memcpy/memset instructions

   - arm64 perf: support the HiSilicon SoC uncore PMU, Arm CMN sysfs
     identifier, support for the NXP i.MX9 SoC DDRC PMU, fixes and
     cleanups

   - Removal of superfluous ISBs on context switch (following
     retrospective architecture tightening)

   - Decode the ISS2 register during faults for additional information
     to help with debugging

   - KPTI clean-up/simplification of the trampoline exit code

   - Addressing several -Wmissing-prototype warnings

   - Kselftest improvements for signal handling and ptrace

   - Fix TPIDR2_EL0 restoring on sigreturn

   - Clean-up, robustness improvements of the module allocation code

   - More sysreg conversions to the automatic register/bitfields
     generation

   - CPU capabilities handling cleanup

   - Arm documentation updates: ACPI, ptdump"

* tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux: (124 commits)
  kselftest/arm64: Add a test case for TPIDR2 restore
  arm64/signal: Restore TPIDR2 register rather than memory state
  arm64: alternatives: make clean_dcache_range_nopatch() noinstr-safe
  Documentation/arm64: Add ptdump documentation
  arm64: hibernate: remove WARN_ON in save_processor_state
  kselftest/arm64: Log signal code and address for unexpected signals
  docs: perf: Fix warning from 'make htmldocs' in hisi-pmu.rst
  arm64/fpsimd: Exit streaming mode when flushing tasks
  docs: perf: Add new description for HiSilicon UC PMU
  drivers/perf: hisi: Add support for HiSilicon UC PMU driver
  drivers/perf: hisi: Add support for HiSilicon H60PA and PAv3 PMU driver
  perf: arm_cspmu: Add missing MODULE_DEVICE_TABLE
  perf/arm-cmn: Add sysfs identifier
  perf/arm-cmn: Revamp model detection
  perf/arm_dmc620: Add cpumask
  arm64: mm: fix VA-range sanity check
  arm64/mm: remove now-superfluous ISBs from TTBR writes
  Documentation/arm64: Update ACPI tables from BBR
  Documentation/arm64: Update references in arm-acpi
  Documentation/arm64: Update ARM and arch reference
  ...

1 files changed, 7 insertions, 3 deletions

diff --git a/arch/arm64/include/asm/mmu_context.h b/arch/arm64/include/asm/mmu_context.h
index 56911691bef0..a6fb325424e7 100644
--- a/arch/arm64/include/asm/mmu_context.h
+++ b/arch/arm64/include/asm/mmu_context.h
@@ -39,11 +39,16 @@ static inline void contextidr_thread_switch(struct task_struct *next)
 /*
  * Set TTBR0 to reserved_pg_dir. No translations will be possible via TTBR0.
  */
-static inline void cpu_set_reserved_ttbr0(void)
+static inline void cpu_set_reserved_ttbr0_nosync(void)
 {
 	unsigned long ttbr = phys_to_ttbr(__pa_symbol(reserved_pg_dir));
 
 	write_sysreg(ttbr, ttbr0_el1);
+}
+
+static inline void cpu_set_reserved_ttbr0(void)
+{
+	cpu_set_reserved_ttbr0_nosync();
 	isb();
 }
 
@@ -52,7 +57,6 @@ void cpu_do_switch_mm(phys_addr_t pgd_phys, struct mm_struct *mm);
 static inline void cpu_switch_mm(pgd_t *pgd, struct mm_struct *mm)
 {
 	BUG_ON(pgd == swapper_pg_dir);
-	cpu_set_reserved_ttbr0();
 	cpu_do_switch_mm(virt_to_phys(pgd),mm);
 }
 
@@ -164,7 +168,7 @@ static inline void cpu_replace_ttbr1(pgd_t *pgdp, pgd_t *idmap)
 		 * up (i.e. cpufeature framework is not up yet) and
 		 * latter only when we enable CNP via cpufeature's
 		 * enable() callback.
-		 * Also we rely on the cpu_hwcap bit being set before
+		 * Also we rely on the system_cpucaps bit being set before
 		 * calling the enable() function.
 		 */
 		ttbr1 |= TTBR_CNP_BIT;