14 files changed, 188 insertions, 88 deletions

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index cf006d40342c..36586dba6fa6 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -1186,6 +1186,15 @@ if !MMU
 source "arch/arm/Kconfig-nommu"
 endif
 
+config ARM_ERRATA_326103
+        bool "ARM errata: FSR write bit incorrect on a SWP to read-only memory"
+        depends on CPU_V6
+        help
+          Executing a SWP instruction to read-only memory does not set bit 11
+          of the FSR on the ARM 1136 prior to r1p0. This causes the kernel to
+          treat the access as a read, preventing a COW from occurring and
+          causing the faulting task to livelock.
+
 config ARM_ERRATA_411920
         bool "ARM errata: Invalidation of the Instruction Cache operation can fail"
         depends on CPU_V6 || CPU_V6K
diff --git a/arch/arm/boot/dts/versatile-ab.dts b/arch/arm/boot/dts/versatile-ab.dts
index 0b32925f2147..e2fe3195c0d1 100644
--- a/arch/arm/boot/dts/versatile-ab.dts
+++ b/arch/arm/boot/dts/versatile-ab.dts
@@ -173,7 +173,7 @@
                         mmc@5000 {
                                 compatible = "arm,primecell";
                                 reg = < 0x5000 0x1000>;
-                                interrupts = <22>;
+                                interrupts = <22 34>;
                         };
                         kmi@6000 {
                                 compatible = "arm,pl050", "arm,primecell";
diff --git a/arch/arm/boot/dts/versatile-pb.dts b/arch/arm/boot/dts/versatile-pb.dts
index 166461073b78..7e8175269064 100644
--- a/arch/arm/boot/dts/versatile-pb.dts
+++ b/arch/arm/boot/dts/versatile-pb.dts
@@ -41,7 +41,7 @@
                         mmc@b000 {
                                 compatible = "arm,primecell";
                                 reg = <0xb000 0x1000>;
-                                interrupts = <23>;
+                                interrupts = <23 34>;
                         };
                 };
         };
diff --git a/arch/arm/include/asm/thread_info.h b/arch/arm/include/asm/thread_info.h
index d4c24d412a8d..0f04d84582e1 100644
--- a/arch/arm/include/asm/thread_info.h
+++ b/arch/arm/include/asm/thread_info.h
@@ -118,6 +118,13 @@ extern void iwmmxt_task_switch(struct thread_info *);
 extern void vfp_sync_hwstate(struct thread_info *);
 extern void vfp_flush_hwstate(struct thread_info *);
 
+struct user_vfp;
+struct user_vfp_exc;
+
+extern int vfp_preserve_user_clear_hwstate(struct user_vfp __user *,
+                                           struct user_vfp_exc __user *);
+extern int vfp_restore_user_hwstate(struct user_vfp __user *,
+                                    struct user_vfp_exc __user *);
 #endif
 
 /*
diff --git a/arch/arm/include/asm/tls.h b/arch/arm/include/asm/tls.h
index 60843eb0f61c..73409e6c0251 100644
--- a/arch/arm/include/asm/tls.h
+++ b/arch/arm/include/asm/tls.h
@@ -7,6 +7,8 @@
 
         .macro set_tls_v6k, tp, tmp1, tmp2
         mcr     p15, 0, \tp, c13, c0, 3         @ set TLS register
+        mov     \tmp1, #0
+        mcr     p15, 0, \tmp1, c13, c0, 2       @ clear user r/w TLS register
         .endm
 
         .macro set_tls_v6, tp, tmp1, tmp2
@@ -15,6 +17,8 @@
         mov     \tmp2, #0xffff0fff
         tst     \tmp1, #HWCAP_TLS               @ hardware TLS available?
         mcrne   p15, 0, \tp, c13, c0, 3         @ yes, set TLS register
+        movne   \tmp1, #0
+        mcrne   p15, 0, \tmp1, c13, c0, 2       @ clear user r/w TLS register
         streq   \tp, [\tmp2, #-15]              @ set TLS value at 0xffff0ff0
         .endm
 
diff --git a/arch/arm/kernel/irq.c b/arch/arm/kernel/irq.c
index 71ccdbfed662..8349d4e97e2b 100644
--- a/arch/arm/kernel/irq.c
+++ b/arch/arm/kernel/irq.c
@@ -155,10 +155,10 @@ static bool migrate_one_irq(struct irq_desc *desc)
         }
 
         c = irq_data_get_irq_chip(d);
-        if (c->irq_set_affinity)
-                c->irq_set_affinity(d, affinity, true);
-        else
+        if (!c->irq_set_affinity)
                 pr_debug("IRQ%u: unable to set affinity\n", d->irq);
+        else if (c->irq_set_affinity(d, affinity, true) == IRQ_SET_MASK_OK && ret)
+                cpumask_copy(d->affinity, affinity);
 
         return ret;
 }
diff --git a/arch/arm/kernel/signal.c b/arch/arm/kernel/signal.c
index 7cb532fc8aa4..d68d1b694680 100644
--- a/arch/arm/kernel/signal.c
+++ b/arch/arm/kernel/signal.c
@@ -180,44 +180,23 @@ static int restore_iwmmxt_context(struct iwmmxt_sigframe *frame)
 
 static int preserve_vfp_context(struct vfp_sigframe __user *frame)
 {
-        struct thread_info *thread = current_thread_info();
-        struct vfp_hard_struct *h = &thread->vfpstate.hard;
         const unsigned long magic = VFP_MAGIC;
         const unsigned long size = VFP_STORAGE_SIZE;
         int err = 0;
 
-        vfp_sync_hwstate(thread);
         __put_user_error(magic, &frame->magic, err);
         __put_user_error(size, &frame->size, err);
 
-        /*
-         * Copy the floating point registers. There can be unused
-         * registers see asm/hwcap.h for details.
-         */
-        err |= __copy_to_user(&frame->ufp.fpregs, &h->fpregs,
-                              sizeof(h->fpregs));
-        /*
-         * Copy the status and control register.
-         */
-        __put_user_error(h->fpscr, &frame->ufp.fpscr, err);
-
-        /*
-         * Copy the exception registers.
-         */
-        __put_user_error(h->fpexc, &frame->ufp_exc.fpexc, err);
-        __put_user_error(h->fpinst, &frame->ufp_exc.fpinst, err);
-        __put_user_error(h->fpinst2, &frame->ufp_exc.fpinst2, err);
+        if (err)
+                return -EFAULT;
 
-        return err ? -EFAULT : 0;
+        return vfp_preserve_user_clear_hwstate(&frame->ufp, &frame->ufp_exc);
 }
 
 static int restore_vfp_context(struct vfp_sigframe __user *frame)
 {
-        struct thread_info *thread = current_thread_info();
-        struct vfp_hard_struct *h = &thread->vfpstate.hard;
         unsigned long magic;
         unsigned long size;
-        unsigned long fpexc;
         int err = 0;
 
         __get_user_error(magic, &frame->magic, err);
@@ -228,33 +207,7 @@ static int restore_vfp_context(struct vfp_sigframe __user *frame)
         if (magic != VFP_MAGIC || size != VFP_STORAGE_SIZE)
                 return -EINVAL;
 
-        vfp_flush_hwstate(thread);
-
-        /*
-         * Copy the floating point registers. There can be unused
-         * registers see asm/hwcap.h for details.
-         */
-        err |= __copy_from_user(&h->fpregs, &frame->ufp.fpregs,
-                                sizeof(h->fpregs));
-        /*
-         * Copy the status and control register.
-         */
-        __get_user_error(h->fpscr, &frame->ufp.fpscr, err);
-
-        /*
-         * Sanitise and restore the exception registers.
-         */
-        __get_user_error(fpexc, &frame->ufp_exc.fpexc, err);
-        /* Ensure the VFP is enabled. */
-        fpexc |= FPEXC_EN;
-        /* Ensure FPINST2 is invalid and the exception flag is cleared. */
-        fpexc &= ~(FPEXC_EX | FPEXC_FP2V);
-        h->fpexc = fpexc;
-
-        __get_user_error(h->fpinst, &frame->ufp_exc.fpinst, err);
-        __get_user_error(h->fpinst2, &frame->ufp_exc.fpinst2, err);
-
-        return err ? -EFAULT : 0;
+        return vfp_restore_user_hwstate(&frame->ufp, &frame->ufp_exc);
 }
 
 #endif
diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c
index addbbe8028c2..f6a4d32b0421 100644
--- a/arch/arm/kernel/smp.c
+++ b/arch/arm/kernel/smp.c
@@ -510,10 +510,6 @@ static void ipi_cpu_stop(unsigned int cpu)
         local_fiq_disable();
         local_irq_disable();
 
-#ifdef CONFIG_HOTPLUG_CPU
-        platform_cpu_kill(cpu);
-#endif
-
         while (1)
                 cpu_relax();
 }
@@ -576,17 +572,25 @@ void smp_send_reschedule(int cpu)
         smp_cross_call(cpumask_of(cpu), IPI_RESCHEDULE);
 }
 
+#ifdef CONFIG_HOTPLUG_CPU
+static void smp_kill_cpus(cpumask_t *mask)
+{
+        unsigned int cpu;
+        for_each_cpu(cpu, mask)
+                platform_cpu_kill(cpu);
+}
+#else
+static void smp_kill_cpus(cpumask_t *mask) { }
+#endif
+
 void smp_send_stop(void)
 {
         unsigned long timeout;
+        struct cpumask mask;
 
-        if (num_online_cpus() > 1) {
-                struct cpumask mask;
-                cpumask_copy(&mask, cpu_online_mask);
-                cpumask_clear_cpu(smp_processor_id(), &mask);
-
-                smp_cross_call(&mask, IPI_CPU_STOP);
-        }
+        cpumask_copy(&mask, cpu_online_mask);
+        cpumask_clear_cpu(smp_processor_id(), &mask);
+        smp_cross_call(&mask, IPI_CPU_STOP);
 
         /* Wait up to one second for other CPUs to stop */
         timeout = USEC_PER_SEC;
@@ -595,6 +599,8 @@ void smp_send_stop(void)
 
         if (num_online_cpus() > 1)
                 pr_warning("SMP: failed to stop secondary CPUs\n");
+
+        smp_kill_cpus(&mask);
 }
 
 /*
diff --git a/arch/arm/mm/abort-ev6.S b/arch/arm/mm/abort-ev6.S
index ff1f7cc11f87..80741992a9fc 100644
--- a/arch/arm/mm/abort-ev6.S
+++ b/arch/arm/mm/abort-ev6.S
@@ -26,18 +26,23 @@ ENTRY(v6_early_abort)
         mrc     p15, 0, r1, c5, c0, 0           @ get FSR
         mrc     p15, 0, r0, c6, c0, 0           @ get FAR
 /*
- * Faulty SWP instruction on 1136 doesn't set bit 11 in DFSR (erratum 326103).
- * The test below covers all the write situations, including Java bytecodes
+ * Faulty SWP instruction on 1136 doesn't set bit 11 in DFSR.
  */
-        bic     r1, r1, #1 << 11                @ clear bit 11 of FSR
+#ifdef CONFIG_ARM_ERRATA_326103
+        ldr     ip, =0x4107b36
+        mrc     p15, 0, r3, c0, c0, 0           @ get processor id
+        teq     ip, r3, lsr #4                  @ r0 ARM1136?
+        bne     do_DataAbort
         tst     r5, #PSR_J_BIT                  @ Java?
+        tsteq   r5, #PSR_T_BIT                  @ Thumb?
         bne     do_DataAbort
-        do_thumb_abort fsr=r1, pc=r4, psr=r5, tmp=r3
-        ldreq   r3, [r4]                        @ read aborted ARM instruction
+        bic     r1, r1, #1 << 11                @ clear bit 11 of FSR
+        ldr     r3, [r4]                        @ read aborted ARM instruction
 #ifdef CONFIG_CPU_ENDIAN_BE8
-        reveq   r3, r3
+        rev     r3, r3
 #endif
         do_ldrd_abort tmp=ip, insn=r3
         tst     r3, #1 << 20                    @ L = 0 -> write
         orreq   r1, r1, #1 << 11                @ yes.
+#endif
         b       do_DataAbort
diff --git a/arch/arm/mm/cache-l2x0.c b/arch/arm/mm/cache-l2x0.c
index a53fd2aaa2f4..2a8e380501e8 100644
--- a/arch/arm/mm/cache-l2x0.c
+++ b/arch/arm/mm/cache-l2x0.c
@@ -32,6 +32,7 @@ static void __iomem *l2x0_base;
 static DEFINE_RAW_SPINLOCK(l2x0_lock);
 static u32 l2x0_way_mask;       /* Bitmask of active ways */
 static u32 l2x0_size;
+static unsigned long sync_reg_offset = L2X0_CACHE_SYNC;
 
 struct l2x0_regs l2x0_saved_regs;
 
@@ -61,12 +62,7 @@ static inline void cache_sync(void)
 {
         void __iomem *base = l2x0_base;
 
-#ifdef CONFIG_PL310_ERRATA_753970
-        /* write to an unmmapped register */
-        writel_relaxed(0, base + L2X0_DUMMY_REG);
-#else
-        writel_relaxed(0, base + L2X0_CACHE_SYNC);
-#endif
+        writel_relaxed(0, base + sync_reg_offset);
         cache_wait(base + L2X0_CACHE_SYNC, 1);
 }
 
@@ -85,10 +81,13 @@ static inline void l2x0_inv_line(unsigned long addr)
 }
 
 #if defined(CONFIG_PL310_ERRATA_588369) || defined(CONFIG_PL310_ERRATA_727915)
+static inline void debug_writel(unsigned long val)
+{
+        if (outer_cache.set_debug)
+                outer_cache.set_debug(val);
+}
 
-#define debug_writel(val)       outer_cache.set_debug(val)
-
-static void l2x0_set_debug(unsigned long val)
+static void pl310_set_debug(unsigned long val)
 {
         writel_relaxed(val, l2x0_base + L2X0_DEBUG_CTRL);
 }
@@ -98,7 +97,7 @@ static inline void debug_writel(unsigned long val)
 {
 }
 
-#define l2x0_set_debug  NULL
+#define pl310_set_debug NULL
 #endif
 
 #ifdef CONFIG_PL310_ERRATA_588369
@@ -331,6 +330,11 @@ void __init l2x0_init(void __iomem *base, u32 aux_val, u32 aux_mask)
                 else
                         ways = 8;
                 type = "L310";
+#ifdef CONFIG_PL310_ERRATA_753970
+                /* Unmapped register. */
+                sync_reg_offset = L2X0_DUMMY_REG;
+#endif
+                outer_cache.set_debug = pl310_set_debug;
                 break;
         case L2X0_CACHE_ID_PART_L210:
                 ways = (aux >> 13) & 0xf;
@@ -379,7 +383,6 @@ void __init l2x0_init(void __iomem *base, u32 aux_val, u32 aux_mask)
         outer_cache.flush_all = l2x0_flush_all;
         outer_cache.inv_all = l2x0_inv_all;
         outer_cache.disable = l2x0_disable;
-        outer_cache.set_debug = l2x0_set_debug;
 
         printk(KERN_INFO "%s cache controller enabled\n", type);
         printk(KERN_INFO "l2x0: %d ways, CACHE_ID 0x%08x, AUX_CTRL 0x%08x, Cache size: %d B\n",
diff --git a/arch/arm/mm/init.c b/arch/arm/mm/init.c
index 595079fa9d1d..8f5813bbffb5 100644
--- a/arch/arm/mm/init.c
+++ b/arch/arm/mm/init.c
@@ -293,11 +293,11 @@ EXPORT_SYMBOL(pfn_valid);
 #endif
 
 #ifndef CONFIG_SPARSEMEM
-static void arm_memory_present(void)
+static void __init arm_memory_present(void)
 {
 }
 #else
-static void arm_memory_present(void)
+static void __init arm_memory_present(void)
 {
         struct memblock_region *reg;
 
diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c
index b86f8933ff91..2c7cf2f9c837 100644
--- a/arch/arm/mm/mmu.c
+++ b/arch/arm/mm/mmu.c
@@ -618,8 +618,8 @@ static void __init alloc_init_section(pud_t *pud, unsigned long addr,
         }
 }
 
-static void alloc_init_pud(pgd_t *pgd, unsigned long addr, unsigned long end,
-        unsigned long phys, const struct mem_type *type)
+static void __init alloc_init_pud(pgd_t *pgd, unsigned long addr,
+        unsigned long end, unsigned long phys, const struct mem_type *type)
 {
         pud_t *pud = pud_offset(pgd, addr);
         unsigned long next;
diff --git a/arch/arm/plat-omap/dma.c b/arch/arm/plat-omap/dma.c
index ecdb3da0dea9..c58d896cd5c3 100644
--- a/arch/arm/plat-omap/dma.c
+++ b/arch/arm/plat-omap/dma.c
@@ -916,6 +916,13 @@ void omap_start_dma(int lch)
                         l |= OMAP_DMA_CCR_BUFFERING_DISABLE;
         l |= OMAP_DMA_CCR_EN;
 
+        /*
+         * As dma_write() uses IO accessors which are weakly ordered, there
+         * is no guarantee that data in coherent DMA memory will be visible
+         * to the DMA device.  Add a memory barrier here to ensure that any
+         * such data is visible prior to enabling DMA.
+         */
+        mb();
         p->dma_write(l, CCR, lch);
 
         dma_chan[lch].flags |= OMAP_DMA_ACTIVE;
@@ -965,6 +972,13 @@ void omap_stop_dma(int lch)
                 p->dma_write(l, CCR, lch);
         }
 
+        /*
+         * Ensure that data transferred by DMA is visible to any access
+         * after DMA has been disabled.  This is important for coherent
+         * DMA regions.
+         */
+        mb();
+
         if (!omap_dma_in_1510_mode() && dma_chan[lch].next_lch != -1) {
                 int next_lch, cur_lch = lch;
                 char dma_chan_link_map[dma_lch_count];
diff --git a/arch/arm/vfp/vfpmodule.c b/arch/arm/vfp/vfpmodule.c
index 858748eaa144..bc683b8219b5 100644
--- a/arch/arm/vfp/vfpmodule.c
+++ b/arch/arm/vfp/vfpmodule.c
@@ -17,6 +17,8 @@
 #include <linux/sched.h>
 #include <linux/smp.h>
 #include <linux/init.h>
+#include <linux/uaccess.h>
+#include <linux/user.h>
 
 #include <asm/cp15.h>
 #include <asm/cputype.h>
@@ -529,6 +531,103 @@ void vfp_flush_hwstate(struct thread_info *thread)
 }
 
 /*
+ * Save the current VFP state into the provided structures and prepare
+ * for entry into a new function (signal handler).
+ */
+int vfp_preserve_user_clear_hwstate(struct user_vfp __user *ufp,
+                                    struct user_vfp_exc __user *ufp_exc)
+{
+        struct thread_info *thread = current_thread_info();
+        struct vfp_hard_struct *hwstate = &thread->vfpstate.hard;
+        int err = 0;
+
+        /* Ensure that the saved hwstate is up-to-date. */
+        vfp_sync_hwstate(thread);
+
+        /*
+         * Copy the floating point registers. There can be unused
+         * registers see asm/hwcap.h for details.
+         */
+        err |= __copy_to_user(&ufp->fpregs, &hwstate->fpregs,
+                              sizeof(hwstate->fpregs));
+        /*
+         * Copy the status and control register.
+         */
+        __put_user_error(hwstate->fpscr, &ufp->fpscr, err);
+
+        /*
+         * Copy the exception registers.
+         */
+        __put_user_error(hwstate->fpexc, &ufp_exc->fpexc, err);
+        __put_user_error(hwstate->fpinst, &ufp_exc->fpinst, err);
+        __put_user_error(hwstate->fpinst2, &ufp_exc->fpinst2, err);
+
+        if (err)
+                return -EFAULT;
+
+        /* Ensure that VFP is disabled. */
+        vfp_flush_hwstate(thread);
+
+        /*
+         * As per the PCS, clear the length and stride bits for function
+         * entry.
+         */
+        hwstate->fpscr &= ~(FPSCR_LENGTH_MASK | FPSCR_STRIDE_MASK);
+
+        /*
+         * Disable VFP in the hwstate so that we can detect if it gets
+         * used.
+         */
+        hwstate->fpexc &= ~FPEXC_EN;
+        return 0;
+}
+
+/* Sanitise and restore the current VFP state from the provided structures. */
+int vfp_restore_user_hwstate(struct user_vfp __user *ufp,
+                             struct user_vfp_exc __user *ufp_exc)
+{
+        struct thread_info *thread = current_thread_info();
+        struct vfp_hard_struct *hwstate = &thread->vfpstate.hard;
+        unsigned long fpexc;
+        int err = 0;
+
+        /*
+         * If VFP has been used, then disable it to avoid corrupting
+         * the new thread state.
+         */
+        if (hwstate->fpexc & FPEXC_EN)
+                vfp_flush_hwstate(thread);
+
+        /*
+         * Copy the floating point registers. There can be unused
+         * registers see asm/hwcap.h for details.
+         */
+        err |= __copy_from_user(&hwstate->fpregs, &ufp->fpregs,
+                                sizeof(hwstate->fpregs));
+        /*
+         * Copy the status and control register.
+         */
+        __get_user_error(hwstate->fpscr, &ufp->fpscr, err);
+
+        /*
+         * Sanitise and restore the exception registers.
+         */
+        __get_user_error(fpexc, &ufp_exc->fpexc, err);
+
+        /* Ensure the VFP is enabled. */
+        fpexc |= FPEXC_EN;
+
+        /* Ensure FPINST2 is invalid and the exception flag is cleared. */
+        fpexc &= ~(FPEXC_EX | FPEXC_FP2V);
+        hwstate->fpexc = fpexc;
+
+        __get_user_error(hwstate->fpinst, &ufp_exc->fpinst, err);
+        __get_user_error(hwstate->fpinst2, &ufp_exc->fpinst2, err);
+
+        return err ? -EFAULT : 0;
+}
+
+/*
  * VFP hardware can lose all context when a CPU goes offline.
  * As we will be running in SMP mode with CPU hotplug, we will save the
  * hardware state at every thread switch.  We clear our held state when