Merge branch 'for-linus' of git://git.linaro.org/people/rmk/linux-arm

Pull core ARM updates from Russell King:
 "This is the bulk of the core ARM updates for this merge window.
  Included in here is a different way to handle the VIVT cache flushing
  on context switch, which should allow scheduler folk to remove a
  special case in their core code.

  We have architectured timer support here, which is a set of timers
  specified by the ARM architecture for future SoCs.  So we should see
  less variability in timer design going forward.

  The last big thing here is my cleanup to the way we handle PCI across
  ARM, fixing some oddities in some platforms which hadn't realised
  there was a way to deal with their private data already built in to
  our PCI backend.

  I've also removed support for the ARMv3 architecture; it hasn't worked
  properly for years so it seems pointless to keep it around."

* 'for-linus' of git://git.linaro.org/people/rmk/linux-arm: (47 commits)
  ARM: PCI: remove per-pci_hw list of buses
  ARM: PCI: dove/kirkwood/mv78xx0: use sys->private_data
  ARM: PCI: provide a default bus scan implementation
  ARM: PCI: get rid of pci_std_swizzle()
  ARM: PCI: versatile: fix PCI interrupt setup
  ARM: PCI: integrator: use common PCI swizzle
  ARM: 7416/1: LPAE: Remove unused L_PTE_(BUFFERABLE|CACHEABLE) macros
  ARM: 7415/1: vfp: convert printk's to pr_*'s
  ARM: decompressor: avoid speculative prefetch from non-RAM areas
  ARM: Remove ARMv3 support from decompressor
  ARM: 7413/1: move read_{boot,persistent}_clock to the architecture level
  ARM: Remove support for ARMv3 ARM610 and ARM710 CPUs
  ARM: 7363/1: DEBUG_LL: limit early mapping to the minimum
  ARM: 7391/1: versatile: add some auxdata for device trees
  ARM: 7389/2: plat-versatile: modernize FPGA IRQ controller
  AMBA: get rid of last two uses of NO_IRQ
  ARM: 7408/1: cacheflush: return error to userspace when flushing syscall fails
  ARM: 7409/1: Do not call flush_cache_user_range with mmap_sem held
  ARM: 7404/1: cmpxchg64: use atomic64 and local64 routines for cmpxchg64
  ARM: 7347/1: SCU: use cpu_logical_map for per-CPU low power mode
  ...

1 files changed, 28 insertions, 29 deletions

diff --git a/arch/arm/mm/context.c b/arch/arm/mm/context.c
index ee9bb363d60..806cc4f6351 100644
--- a/arch/arm/mm/context.c
+++ b/arch/arm/mm/context.c
@@ -18,30 +18,39 @@
 
 static DEFINE_RAW_SPINLOCK(cpu_asid_lock);
 unsigned int cpu_last_asid = ASID_FIRST_VERSION;
-#ifdef CONFIG_SMP
-DEFINE_PER_CPU(struct mm_struct *, current_mm);
-#endif
 
 #ifdef CONFIG_ARM_LPAE
-#define cpu_set_asid(asid) {						\
-	unsigned long ttbl, ttbh;					\
-	asm volatile(							\
-	"	mrrc	p15, 0, %0, %1, c2		@ read TTBR0\n"	\
-	"	mov	%1, %2, lsl #(48 - 32)		@ set ASID\n"	\
-	"	mcrr	p15, 0, %0, %1, c2		@ set TTBR0\n"	\
-	: "=&r" (ttbl), "=&r" (ttbh)					\
-	: "r" (asid & ~ASID_MASK));					\
+void cpu_set_reserved_ttbr0(void)
+{
+	unsigned long ttbl = __pa(swapper_pg_dir);
+	unsigned long ttbh = 0;
+
+	/*
+	 * Set TTBR0 to swapper_pg_dir which contains only global entries. The
+	 * ASID is set to 0.
+	 */
+	asm volatile(
+	"	mcrr	p15, 0, %0, %1, c2		@ set TTBR0\n"
+	:
+	: "r" (ttbl), "r" (ttbh));
+	isb();
 }
 #else
-#define cpu_set_asid(asid) \
-	asm("	mcr	p15, 0, %0, c13, c0, 1\n" : : "r" (asid))
+void cpu_set_reserved_ttbr0(void)
+{
+	u32 ttb;
+	/* Copy TTBR1 into TTBR0 */
+	asm volatile(
+	"	mrc	p15, 0, %0, c2, c0, 1		@ read TTBR1\n"
+	"	mcr	p15, 0, %0, c2, c0, 0		@ set TTBR0\n"
+	: "=r" (ttb));
+	isb();
+}
 #endif
 
 /*
  * We fork()ed a process, and we need a new context for the child
- * to run in.  We reserve version 0 for initial tasks so we will
- * always allocate an ASID. The ASID 0 is reserved for the TTBR
- * register changing sequence.
+ * to run in.
  */
 void __init_new_context(struct task_struct *tsk, struct mm_struct *mm)
 {
@@ -51,9 +60,7 @@ void __init_new_context(struct task_struct *tsk, struct mm_struct *mm)
 
 static void flush_context(void)
 {
-	/* set the reserved ASID before flushing the TLB */
-	cpu_set_asid(0);
-	isb();
+	cpu_set_reserved_ttbr0();
 	local_flush_tlb_all();
 	if (icache_is_vivt_asid_tagged()) {
 		__flush_icache_all();
@@ -98,14 +105,7 @@ static void reset_context(void *info)
 {
 	unsigned int asid;
 	unsigned int cpu = smp_processor_id();
-	struct mm_struct *mm = per_cpu(current_mm, cpu);
-
-	/*
-	 * Check if a current_mm was set on this CPU as it might still
-	 * be in the early booting stages and using the reserved ASID.
-	 */
-	if (!mm)
-		return;
+	struct mm_struct *mm = current->active_mm;
 
 	smp_rmb();
 	asid = cpu_last_asid + cpu + 1;
@@ -114,8 +114,7 @@ static void reset_context(void *info)
 	set_mm_context(mm, asid);
 
 	/* set the new ASID */
-	cpu_set_asid(mm->context.id);
-	isb();
+	cpu_switch_mm(mm->pgd, mm);
 }
 
 #else