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

Pull ARM64 updates from Catalin Marinas:
 - KGDB support for arm64
 - PCI I/O space extended to 16M (in preparation of PCIe support
   patches)
 - Dropping ZONE_DMA32 in favour of ZONE_DMA (we only need one for the
   time being), together with swiotlb late initialisation to correctly
   setup the bounce buffer
 - DMA API cache maintenance support (not all ARMv8 platforms have
   hardware cache coherency)
 - Crypto extensions advertising via ELF_HWCAP2 for compat user space
 - Perf support for dwarf unwinding in compat mode
 - asm/tlb.h converted to the generic mmu_gather code
 - asm-generic rwsem implementation
 - Code clean-up

* tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux: (42 commits)
  arm64: Remove pgprot_dmacoherent()
  arm64: Support DMA_ATTR_WRITE_COMBINE
  arm64: Implement custom mmap functions for dma mapping
  arm64: Fix __range_ok macro
  arm64: Fix duplicated Kconfig entries
  arm64: mm: Route pmd thp functions through pte equivalents
  arm64: rwsem: use asm-generic rwsem implementation
  asm-generic: rwsem: de-PPCify rwsem.h
  arm64: enable generic CPU feature modalias matching for this architecture
  arm64: smp: make local symbol static
  arm64: debug: make local symbols static
  ARM64: perf: support dwarf unwinding in compat mode
  ARM64: perf: add support for frame pointer unwinding in compat mode
  ARM64: perf: add support for perf registers API
  arm64: Add boot time configuration of Intermediate Physical Address size
  arm64: Do not synchronise I and D caches for special ptes
  arm64: Make DMA coherent and strongly ordered mappings not executable
  arm64: barriers: add dmb barrier
  arm64: topology: Implement basic CPU topology support
  arm64: advertise ARMv8 extensions to 32-bit compat ELF binaries
  ...

arch/arm64/kernel/process.c

@@ -71,8 +71,17 @@ static void setup_restart(void)
 
 void soft_restart(unsigned long addr)
 {
+	typedef void (*phys_reset_t)(unsigned long);
+	phys_reset_t phys_reset;
+
 	setup_restart();
-	cpu_reset(addr);
+
+	/* Switch to the identity mapping */
+	phys_reset = (phys_reset_t)virt_to_phys(cpu_reset);
+	phys_reset(addr);
+
+	/* Should never get here */
+	BUG();
 }
 
 /*