8 files changed, 60 insertions, 33 deletions

diff --git a/arch/powerpc/kernel/entry_64.S b/arch/powerpc/kernel/entry_64.S
index f9fd54bfcc84..9763267e38b4 100644
--- a/arch/powerpc/kernel/entry_64.S
+++ b/arch/powerpc/kernel/entry_64.S
@@ -658,42 +658,43 @@ do_work:
         cmpdi   r0,0
         crandc  eq,cr1*4+eq,eq
         bne     restore
-        /* here we are preempting the current task */
-1:
-#ifdef CONFIG_TRACE_IRQFLAGS
-        bl      .trace_hardirqs_on
-        /* Note: we just clobbered r10 which used to contain the previous
-         * MSR before the hard-disabling done by the caller of do_work.
-         * We don't have that value anymore, but it doesn't matter as
-         * we will hard-enable unconditionally, we can just reload the
-         * current MSR into r10
+
+        /* Here we are preempting the current task.
+         *
+         * Ensure interrupts are soft-disabled. We also properly mark
+         * the PACA to reflect the fact that they are hard-disabled
+         * and trace the change
          */
-        mfmsr   r10
-#endif /* CONFIG_TRACE_IRQFLAGS */
-        li      r0,1
+        li      r0,0
         stb     r0,PACASOFTIRQEN(r13)
         stb     r0,PACAHARDIRQEN(r13)
+        TRACE_DISABLE_INTS
+
+        /* Call the scheduler with soft IRQs off */
+1:      bl      .preempt_schedule_irq
+
+        /* Hard-disable interrupts again (and update PACA) */
 #ifdef CONFIG_PPC_BOOK3E
-        wrteei  1
-        bl      .preempt_schedule
         wrteei  0
 #else
-        ori     r10,r10,MSR_EE
-        mtmsrd  r10,1           /* reenable interrupts */
-        bl      .preempt_schedule
         mfmsr   r10
-        clrrdi  r9,r1,THREAD_SHIFT
-        rldicl  r10,r10,48,1    /* disable interrupts again */
+        rldicl  r10,r10,48,1
         rotldi  r10,r10,16
         mtmsrd  r10,1
 #endif /* CONFIG_PPC_BOOK3E */
+        li      r0,0
+        stb     r0,PACAHARDIRQEN(r13)
+
+        /* Re-test flags and eventually loop */
+        clrrdi  r9,r1,THREAD_SHIFT
         ld      r4,TI_FLAGS(r9)
         andi.   r0,r4,_TIF_NEED_RESCHED
         bne     1b
         b       restore
 
 user_work:
-#endif
+#endif /* CONFIG_PREEMPT */
+
         /* Enable interrupts */
 #ifdef CONFIG_PPC_BOOK3E
         wrteei  1
diff --git a/arch/powerpc/kernel/pci_64.c b/arch/powerpc/kernel/pci_64.c
index ba949a2c93ac..ccf56ac92de5 100644
--- a/arch/powerpc/kernel/pci_64.c
+++ b/arch/powerpc/kernel/pci_64.c
@@ -97,7 +97,9 @@ int pcibios_unmap_io_space(struct pci_bus *bus)
          * to do an appropriate TLB flush here too
          */
         if (bus->self) {
+#ifdef CONFIG_PPC_STD_MMU_64
                 struct resource *res = bus->resource[0];
+#endif
 
                 pr_debug("IO unmapping for PCI-PCI bridge %s\n",
                          pci_name(bus->self));
diff --git a/arch/powerpc/kernel/perf_event.c b/arch/powerpc/kernel/perf_event.c
index bbcbae183e92..87f1663584b0 100644
--- a/arch/powerpc/kernel/perf_event.c
+++ b/arch/powerpc/kernel/perf_event.c
@@ -116,20 +116,23 @@ static inline void perf_get_data_addr(struct pt_regs *regs, u64 *addrp)
 static inline u32 perf_get_misc_flags(struct pt_regs *regs)
 {
         unsigned long mmcra = regs->dsisr;
+        unsigned long sihv = MMCRA_SIHV;
+        unsigned long sipr = MMCRA_SIPR;
 
         if (TRAP(regs) != 0xf00)
                 return 0;       /* not a PMU interrupt */
 
         if (ppmu->flags & PPMU_ALT_SIPR) {
-                if (mmcra & POWER6_MMCRA_SIHV)
-                        return PERF_RECORD_MISC_HYPERVISOR;
-                return (mmcra & POWER6_MMCRA_SIPR) ?
-                        PERF_RECORD_MISC_USER : PERF_RECORD_MISC_KERNEL;
+                sihv = POWER6_MMCRA_SIHV;
+                sipr = POWER6_MMCRA_SIPR;
         }
-        if (mmcra & MMCRA_SIHV)
+
+        /* PR has priority over HV, so order below is important */
+        if (mmcra & sipr)
+                return PERF_RECORD_MISC_USER;
+        if ((mmcra & sihv) && (freeze_events_kernel != MMCR0_FCHV))
                 return PERF_RECORD_MISC_HYPERVISOR;
-        return (mmcra & MMCRA_SIPR) ? PERF_RECORD_MISC_USER :
-                PERF_RECORD_MISC_KERNEL;
+        return PERF_RECORD_MISC_KERNEL;
 }
 
 /*
diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c
index 2ec1eaed19ca..c930ac38e59f 100644
--- a/arch/powerpc/kernel/process.c
+++ b/arch/powerpc/kernel/process.c
@@ -1172,7 +1172,7 @@ unsigned long arch_randomize_brk(struct mm_struct *mm)
         unsigned long base = mm->brk;
         unsigned long ret;
 
-#ifdef CONFIG_PPC64
+#ifdef CONFIG_PPC_STD_MMU_64
         /*
          * If we are using 1TB segments and we are allowed to randomise
          * the heap, we can put it above 1TB so it is backed by a 1TB
diff --git a/arch/powerpc/kernel/setup_64.c b/arch/powerpc/kernel/setup_64.c
index 797ea95aae2e..04f638d82fb3 100644
--- a/arch/powerpc/kernel/setup_64.c
+++ b/arch/powerpc/kernel/setup_64.c
@@ -57,7 +57,6 @@
 #include <asm/cache.h>
 #include <asm/page.h>
 #include <asm/mmu.h>
-#include <asm/mmu-hash64.h>
 #include <asm/firmware.h>
 #include <asm/xmon.h>
 #include <asm/udbg.h>
diff --git a/arch/powerpc/kernel/time.c b/arch/powerpc/kernel/time.c
index 92dc844299b6..a136a11c490d 100644
--- a/arch/powerpc/kernel/time.c
+++ b/arch/powerpc/kernel/time.c
@@ -777,7 +777,7 @@ int update_persistent_clock(struct timespec now)
         return ppc_md.set_rtc_time(&tm);
 }
 
-void read_persistent_clock(struct timespec *ts)
+static void __read_persistent_clock(struct timespec *ts)
 {
         struct rtc_time tm;
         static int first = 1;
@@ -800,10 +800,23 @@ void read_persistent_clock(struct timespec *ts)
                 return;
         }
         ppc_md.get_rtc_time(&tm);
+
         ts->tv_sec = mktime(tm.tm_year+1900, tm.tm_mon+1, tm.tm_mday,
                             tm.tm_hour, tm.tm_min, tm.tm_sec);
 }
 
+void read_persistent_clock(struct timespec *ts)
+{
+        __read_persistent_clock(ts);
+
+        /* Sanitize it in case real time clock is set below EPOCH */
+        if (ts->tv_sec < 0) {
+                ts->tv_sec = 0;
+                ts->tv_nsec = 0;
+        }
+                
+}
+
 /* clocksource code */
 static cycle_t rtc_read(struct clocksource *cs)
 {
diff --git a/arch/powerpc/kernel/vdso.c b/arch/powerpc/kernel/vdso.c
index 94e2df3cae07..137dc22afa42 100644
--- a/arch/powerpc/kernel/vdso.c
+++ b/arch/powerpc/kernel/vdso.c
@@ -50,6 +50,9 @@
 /* Max supported size for symbol names */
 #define MAX_SYMNAME     64
 
+/* The alignment of the vDSO */
+#define VDSO_ALIGNMENT  (1 << 16)
+
 extern char vdso32_start, vdso32_end;
 static void *vdso32_kbase = &vdso32_start;
 static unsigned int vdso32_pages;
@@ -231,15 +234,21 @@ int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp)
          * pick a base address for the vDSO in process space. We try to put it
          * at vdso_base which is the "natural" base for it, but we might fail
          * and end up putting it elsewhere.
+         * Add enough to the size so that the result can be aligned.
          */
         down_write(&mm->mmap_sem);
         vdso_base = get_unmapped_area(NULL, vdso_base,
-                                      vdso_pages << PAGE_SHIFT, 0, 0);
+                                      (vdso_pages << PAGE_SHIFT) +
+                                      ((VDSO_ALIGNMENT - 1) & PAGE_MASK),
+                                      0, 0);
         if (IS_ERR_VALUE(vdso_base)) {
                 rc = vdso_base;
                 goto fail_mmapsem;
         }
 
+        /* Add required alignment. */
+        vdso_base = ALIGN(vdso_base, VDSO_ALIGNMENT);
+
         /*
          * Put vDSO base into mm struct. We need to do this before calling
          * install_special_mapping or the perf counter mmap tracking code
diff --git a/arch/powerpc/kernel/vdso32/vdso32.lds.S b/arch/powerpc/kernel/vdso32/vdso32.lds.S
index 904ef1360dd7..0546bcd49cd0 100644
--- a/arch/powerpc/kernel/vdso32/vdso32.lds.S
+++ b/arch/powerpc/kernel/vdso32/vdso32.lds.S
@@ -25,7 +25,7 @@ SECTIONS
         . = ALIGN(16);
         .text           : {
                 *(.text .stub .text.* .gnu.linkonce.t.* __ftr_alt_*)
-        }
+        }                                               :text
         PROVIDE(__etext = .);
         PROVIDE(_etext = .);
         PROVIDE(etext = .);
@@ -56,7 +56,7 @@ SECTIONS
         .fixup          : { *(.fixup) }
 
         .dynamic        : { *(.dynamic) }               :text   :dynamic
-        .got            : { *(.got) }
+        .got            : { *(.got) }                   :text
         .plt            : { *(.plt) }
 
         _end = .;