Merge branch 'master'

20 files changed, 178 insertions, 123 deletions

diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 167e70e95556..6729c98b66f9 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -366,6 +366,7 @@ config PPC_PMAC64
         select U3_DART
         select MPIC_BROKEN_U3
         select GENERIC_TBSYNC
+        select PPC_970_NAP
         default y
 
 config PPC_PREP
@@ -383,6 +384,7 @@ config PPC_MAPLE
         select MPIC_BROKEN_U3
         select GENERIC_TBSYNC
         select PPC_UDBG_16550
+        select PPC_970_NAP
         default n
         help
           This option enables support for the Maple 970FX Evaluation Board.
@@ -457,6 +459,10 @@ config PPC_MPC106
         bool
         default n
 
+config PPC_970_NAP
+        bool
+        default n
+
 source "drivers/cpufreq/Kconfig"
 
 config CPU_FREQ_PMAC
diff --git a/arch/powerpc/Makefile b/arch/powerpc/Makefile
index 6ec84d37a337..ed5b26aa8be3 100644
--- a/arch/powerpc/Makefile
+++ b/arch/powerpc/Makefile
@@ -104,6 +104,10 @@ ifndef CONFIG_FSL_BOOKE
 CFLAGS          += -mstring
 endif
 
+ifeq ($(CONFIG_6xx),y)
+CFLAGS          += -mcpu=powerpc
+endif
+
 cpu-as-$(CONFIG_PPC64BRIDGE)    += -Wa,-mppc64bridge
 cpu-as-$(CONFIG_4xx)            += -Wa,-m405
 cpu-as-$(CONFIG_6xx)            += -Wa,-maltivec
diff --git a/arch/powerpc/kernel/Makefile b/arch/powerpc/kernel/Makefile
index 0cc0995b81b0..803858e86160 100644
--- a/arch/powerpc/kernel/Makefile
+++ b/arch/powerpc/kernel/Makefile
@@ -20,7 +20,7 @@ obj-$(CONFIG_PPC64)		+= setup_64.o binfmt_elf32.o sys_ppc32.o \
                                    firmware.o sysfs.o
 obj-$(CONFIG_PPC64)             += vdso64/
 obj-$(CONFIG_ALTIVEC)           += vecemu.o vector.o
-obj-$(CONFIG_POWER4)            += idle_power4.o
+obj-$(CONFIG_PPC_970_NAP)       += idle_power4.o
 obj-$(CONFIG_PPC_OF)            += of_device.o prom_parse.o
 procfs-$(CONFIG_PPC64)          := proc_ppc64.o
 obj-$(CONFIG_PROC_FS)           += $(procfs-y)
diff --git a/arch/powerpc/kernel/asm-offsets.c b/arch/powerpc/kernel/asm-offsets.c
index 54b48f330051..8f85c5e8a55a 100644
--- a/arch/powerpc/kernel/asm-offsets.c
+++ b/arch/powerpc/kernel/asm-offsets.c
@@ -91,6 +91,7 @@ int main(void)
 #endif /* CONFIG_PPC64 */
 
         DEFINE(TI_FLAGS, offsetof(struct thread_info, flags));
+        DEFINE(TI_LOCAL_FLAGS, offsetof(struct thread_info, local_flags));
         DEFINE(TI_PREEMPT, offsetof(struct thread_info, preempt_count));
         DEFINE(TI_TASK, offsetof(struct thread_info, task));
 #ifdef CONFIG_PPC32
diff --git a/arch/powerpc/kernel/entry_32.S b/arch/powerpc/kernel/entry_32.S
index b3a979467225..8866fd26c6b9 100644
--- a/arch/powerpc/kernel/entry_32.S
+++ b/arch/powerpc/kernel/entry_32.S
@@ -128,37 +128,36 @@ transfer_to_handler:
         stw     r12,4(r11)
 #endif
         b       3f
+
 2:      /* if from kernel, check interrupted DOZE/NAP mode and
          * check for stack overflow
          */
+        lwz     r9,THREAD_INFO-THREAD(r12)
+        cmplw   r1,r9                   /* if r1 <= current->thread_info */
+        ble-    stack_ovf               /* then the kernel stack overflowed */
+5:
 #ifdef CONFIG_6xx
-        mfspr   r11,SPRN_HID0
-        mtcr    r11
-BEGIN_FTR_SECTION
-        bt-     8,4f                    /* Check DOZE */
-END_FTR_SECTION_IFSET(CPU_FTR_CAN_DOZE)
-BEGIN_FTR_SECTION
-        bt-     9,4f                    /* Check NAP */
-END_FTR_SECTION_IFSET(CPU_FTR_CAN_NAP)
+        tophys(r9,r9)                   /* check local flags */
+        lwz     r12,TI_LOCAL_FLAGS(r9)
+        mtcrf   0x01,r12
+        bt-     31-TLF_NAPPING,4f
 #endif /* CONFIG_6xx */
         .globl transfer_to_handler_cont
 transfer_to_handler_cont:
-        lwz     r11,THREAD_INFO-THREAD(r12)
-        cmplw   r1,r11                  /* if r1 <= current->thread_info */
-        ble-    stack_ovf               /* then the kernel stack overflowed */
 3:
         mflr    r9
         lwz     r11,0(r9)               /* virtual address of handler */
         lwz     r9,4(r9)                /* where to go when done */
-        FIX_SRR1(r10,r12)
         mtspr   SPRN_SRR0,r11
         mtspr   SPRN_SRR1,r10
         mtlr    r9
         SYNC
         RFI                             /* jump to handler, enable MMU */
 
-#ifdef CONFIG_6xx       
-4:      b       power_save_6xx_restore
+#ifdef CONFIG_6xx
+4:      rlwinm  r12,r12,0,~_TLF_NAPPING
+        stw     r12,TI_LOCAL_FLAGS(r9)
+        b       power_save_6xx_restore
 #endif
 
 /*
@@ -167,10 +166,10 @@ transfer_to_handler_cont:
  */
 stack_ovf:
         /* sometimes we use a statically-allocated stack, which is OK. */
-        lis     r11,_end@h
-        ori     r11,r11,_end@l
-        cmplw   r1,r11
-        ble     3b                      /* r1 <= &_end is OK */
+        lis     r12,_end@h
+        ori     r12,r12,_end@l
+        cmplw   r1,r12
+        ble     5b                      /* r1 <= &_end is OK */
         SAVE_NVGPRS(r11)
         addi    r3,r1,STACK_FRAME_OVERHEAD
         lis     r1,init_thread_union@ha
diff --git a/arch/powerpc/kernel/head_64.S b/arch/powerpc/kernel/head_64.S
index a5ae04a57c78..b7d140430a41 100644
--- a/arch/powerpc/kernel/head_64.S
+++ b/arch/powerpc/kernel/head_64.S
@@ -376,11 +376,28 @@ label##_common:						\
         bl      hdlr;                                   \
         b       .ret_from_except
 
+/*
+ * Like STD_EXCEPTION_COMMON, but for exceptions that can occur
+ * in the idle task and therefore need the special idle handling.
+ */
+#define STD_EXCEPTION_COMMON_IDLE(trap, label, hdlr)    \
+        .align  7;                                      \
+        .globl label##_common;                          \
+label##_common:                                         \
+        EXCEPTION_PROLOG_COMMON(trap, PACA_EXGEN);      \
+        FINISH_NAP;                                     \
+        DISABLE_INTS;                                   \
+        bl      .save_nvgprs;                           \
+        addi    r3,r1,STACK_FRAME_OVERHEAD;             \
+        bl      hdlr;                                   \
+        b       .ret_from_except
+
 #define STD_EXCEPTION_COMMON_LITE(trap, label, hdlr)    \
         .align  7;                                      \
         .globl label##_common;                          \
 label##_common:                                         \
         EXCEPTION_PROLOG_COMMON(trap, PACA_EXGEN);      \
+        FINISH_NAP;                                     \
         DISABLE_INTS;                                   \
         bl      .ppc64_runlatch_on;                     \
         addi    r3,r1,STACK_FRAME_OVERHEAD;             \
@@ -388,6 +405,25 @@ label##_common:						\
         b       .ret_from_except_lite
 
 /*
+ * When the idle code in power4_idle puts the CPU into NAP mode,
+ * it has to do so in a loop, and relies on the external interrupt
+ * and decrementer interrupt entry code to get it out of the loop.
+ * It sets the _TLF_NAPPING bit in current_thread_info()->local_flags
+ * to signal that it is in the loop and needs help to get out.
+ */
+#ifdef CONFIG_PPC_970_NAP
+#define FINISH_NAP                              \
+BEGIN_FTR_SECTION                               \
+        clrrdi  r11,r1,THREAD_SHIFT;            \
+        ld      r9,TI_LOCAL_FLAGS(r11);         \
+        andi.   r10,r9,_TLF_NAPPING;            \
+        bnel    power4_fixup_nap;               \
+END_FTR_SECTION_IFSET(CPU_FTR_CAN_NAP)
+#else
+#define FINISH_NAP
+#endif
+
+/*
  * Start of pSeries system interrupt routines
  */
         . = 0x100
@@ -772,6 +808,7 @@ hardware_interrupt_iSeries_masked:
         .globl machine_check_common
 machine_check_common:
         EXCEPTION_PROLOG_COMMON(0x200, PACA_EXMC)
+        FINISH_NAP
         DISABLE_INTS
         bl      .save_nvgprs
         addi    r3,r1,STACK_FRAME_OVERHEAD
@@ -783,7 +820,7 @@ machine_check_common:
         STD_EXCEPTION_COMMON(0xb00, trap_0b, .unknown_exception)
         STD_EXCEPTION_COMMON(0xd00, single_step, .single_step_exception)
         STD_EXCEPTION_COMMON(0xe00, trap_0e, .unknown_exception)
-        STD_EXCEPTION_COMMON(0xf00, performance_monitor, .performance_monitor_exception)
+        STD_EXCEPTION_COMMON_IDLE(0xf00, performance_monitor, .performance_monitor_exception)
         STD_EXCEPTION_COMMON(0x1300, instruction_breakpoint, .instruction_breakpoint_exception)
 #ifdef CONFIG_ALTIVEC
         STD_EXCEPTION_COMMON(0x1700, altivec_assist, .altivec_assist_exception)
@@ -1034,6 +1071,7 @@ unrecov_slb:
         .globl hardware_interrupt_entry
 hardware_interrupt_common:
         EXCEPTION_PROLOG_COMMON(0x500, PACA_EXGEN)
+        FINISH_NAP
 hardware_interrupt_entry:
         DISABLE_INTS
         bl      .ppc64_runlatch_on
@@ -1041,6 +1079,15 @@ hardware_interrupt_entry:
         bl      .do_IRQ
         b       .ret_from_except_lite
 
+#ifdef CONFIG_PPC_970_NAP
+power4_fixup_nap:
+        andc    r9,r9,r10
+        std     r9,TI_LOCAL_FLAGS(r11)
+        ld      r10,_LINK(r1)           /* make idle task do the */
+        std     r10,_NIP(r1)            /* equivalent of a blr */
+        blr
+#endif
+
         .align  7
         .globl alignment_common
 alignment_common:
diff --git a/arch/powerpc/kernel/idle.c b/arch/powerpc/kernel/idle.c
index e9f321d74d85..d491052c8e0c 100644
--- a/arch/powerpc/kernel/idle.c
+++ b/arch/powerpc/kernel/idle.c
@@ -50,9 +50,9 @@ void cpu_idle(void)
 
         set_thread_flag(TIF_POLLING_NRFLAG);
         while (1) {
-                ppc64_runlatch_off();
-
                 while (!need_resched() && !cpu_should_die()) {
+                        ppc64_runlatch_off();
+
                         if (ppc_md.power_save) {
                                 clear_thread_flag(TIF_POLLING_NRFLAG);
                                 /*
diff --git a/arch/powerpc/kernel/idle_6xx.S b/arch/powerpc/kernel/idle_6xx.S
index 12a4efbaa08f..b45fa0e37212 100644
--- a/arch/powerpc/kernel/idle_6xx.S
+++ b/arch/powerpc/kernel/idle_6xx.S
@@ -22,8 +22,6 @@
 #include <asm/ppc_asm.h>
 #include <asm/asm-offsets.h>
 
-#undef DEBUG
-
         .text
 
 /*
@@ -109,12 +107,6 @@ BEGIN_FTR_SECTION
         dcbf    0,r4
         dcbf    0,r4
 END_FTR_SECTION_IFSET(CPU_FTR_NAP_DISABLE_L2_PR)
-#ifdef DEBUG
-        lis     r6,nap_enter_count@ha
-        lwz     r4,nap_enter_count@l(r6)
-        addi    r4,r4,1
-        stw     r4,nap_enter_count@l(r6)
-#endif  
 2:
 BEGIN_FTR_SECTION
         /* Go to low speed mode on some 750FX */
@@ -144,48 +136,42 @@ BEGIN_FTR_SECTION
         DSSALL
         sync
 END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC)
+        rlwinm  r9,r1,0,0,31-THREAD_SHIFT       /* current thread_info */
+        lwz     r8,TI_LOCAL_FLAGS(r9)   /* set napping bit */
+        ori     r8,r8,_TLF_NAPPING      /* so when we take an exception */
+        stw     r8,TI_LOCAL_FLAGS(r9)   /* it will return to our caller */
         mfmsr   r7
         ori     r7,r7,MSR_EE
         oris    r7,r7,MSR_POW@h
-        sync
-        isync
+1:      sync
         mtmsr   r7
         isync
-        sync
-        blr
-        
+        b       1b
+
 /*
  * Return from NAP/DOZE mode, restore some CPU specific registers,
  * we are called with DR/IR still off and r2 containing physical
- * address of current.
+ * address of current.  R11 points to the exception frame (physical
+ * address).  We have to preserve r10.
  */
 _GLOBAL(power_save_6xx_restore)
-        mfspr   r11,SPRN_HID0
-        rlwinm. r11,r11,0,10,8  /* Clear NAP & copy NAP bit !state to cr1 EQ */
-        cror    4*cr1+eq,4*cr0+eq,4*cr0+eq
-BEGIN_FTR_SECTION
-        rlwinm  r11,r11,0,9,7   /* Clear DOZE */
-END_FTR_SECTION_IFSET(CPU_FTR_CAN_DOZE)
-        mtspr   SPRN_HID0, r11
+        lwz     r9,_LINK(r11)           /* interrupted in ppc6xx_idle: */
+        stw     r9,_NIP(r11)            /* make it do a blr */
 
-#ifdef DEBUG
-        beq     cr1,1f
-        lis     r11,(nap_return_count-KERNELBASE)@ha
-        lwz     r9,nap_return_count@l(r11)
-        addi    r9,r9,1
-        stw     r9,nap_return_count@l(r11)
-1:
-#endif
-        
-        rlwinm  r9,r1,0,0,18
-        tophys(r9,r9)
-        lwz     r11,TI_CPU(r9)
+#ifdef CONFIG_SMP
+        mfspr   r12,SPRN_SPRG3
+        lwz     r11,TI_CPU(r12)         /* get cpu number * 4 */
         slwi    r11,r11,2
+#else
+        li      r11,0
+#endif
         /* Todo make sure all these are in the same page
-         * and load r22 (@ha part + CPU offset) only once
+         * and load r11 (@ha part + CPU offset) only once
          */
 BEGIN_FTR_SECTION
-        beq     cr1,1f
+        mfspr   r9,SPRN_HID0
+        andis.  r9,r9,HID0_NAP@h
+        beq     1f
         addis   r9,r11,(nap_save_msscr0-KERNELBASE)@ha
         lwz     r9,nap_save_msscr0@l(r9)
         mtspr   SPRN_MSSCR0, r9
@@ -210,10 +196,3 @@ _GLOBAL(nap_save_hid1)
 
 _GLOBAL(powersave_lowspeed)
         .long   0
-
-#ifdef DEBUG
-_GLOBAL(nap_enter_count)
-        .space  4
-_GLOBAL(nap_return_count)
-        .space  4
-#endif
diff --git a/arch/powerpc/kernel/idle_power4.S b/arch/powerpc/kernel/idle_power4.S
index 6dad1c02496e..d85c7c938eed 100644
--- a/arch/powerpc/kernel/idle_power4.S
+++ b/arch/powerpc/kernel/idle_power4.S
@@ -35,12 +35,16 @@ BEGIN_FTR_SECTION
         DSSALL
         sync
 END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC)
+        clrrdi  r9,r1,THREAD_SHIFT      /* current thread_info */
+        ld      r8,TI_LOCAL_FLAGS(r9)   /* set napping bit */
+        ori     r8,r8,_TLF_NAPPING      /* so when we take an exception */
+        std     r8,TI_LOCAL_FLAGS(r9)   /* it will return to our caller */
         mfmsr   r7
         ori     r7,r7,MSR_EE
         oris    r7,r7,MSR_POW@h
-        sync
+1:      sync
         isync
         mtmsrd  r7
         isync
-        sync
-        blr
+        b       1b
+
diff --git a/arch/powerpc/kernel/irq.c b/arch/powerpc/kernel/irq.c
index bb5c9501234c..57d560c68897 100644
--- a/arch/powerpc/kernel/irq.c
+++ b/arch/powerpc/kernel/irq.c
@@ -272,18 +272,26 @@ unsigned int virt_irq_to_real_map[NR_IRQS];
  * Don't use virtual irqs 0, 1, 2 for devices.
  * The pcnet32 driver considers interrupt numbers < 2 to be invalid,
  * and 2 is the XICS IPI interrupt.
- * We limit virtual irqs to 17 less than NR_IRQS so that when we
- * offset them by 16 (to reserve the first 16 for ISA interrupts)
- * we don't end up with an interrupt number >= NR_IRQS.
+ * We limit virtual irqs to __irq_offet_value less than virt_irq_max so
+ * that when we offset them we don't end up with an interrupt
+ * number >= virt_irq_max.
  */
 #define MIN_VIRT_IRQ    3
-#define MAX_VIRT_IRQ    (NR_IRQS - NUM_ISA_INTERRUPTS - 1)
-#define NR_VIRT_IRQS    (MAX_VIRT_IRQ - MIN_VIRT_IRQ + 1)
+
+unsigned int virt_irq_max;
+static unsigned int max_virt_irq;
+static unsigned int nr_virt_irqs;
 
 void
 virt_irq_init(void)
 {
         int i;
+
+        if ((virt_irq_max == 0) || (virt_irq_max > (NR_IRQS - 1)))
+                virt_irq_max = NR_IRQS - 1;
+        max_virt_irq = virt_irq_max - __irq_offset_value;
+        nr_virt_irqs = max_virt_irq - MIN_VIRT_IRQ + 1;
+
         for (i = 0; i < NR_IRQS; i++)
                 virt_irq_to_real_map[i] = UNDEFINED_IRQ;
 }
@@ -308,17 +316,17 @@ int virt_irq_create_mapping(unsigned int real_irq)
                 return real_irq;
         }
 
-        /* map to a number between MIN_VIRT_IRQ and MAX_VIRT_IRQ */
+        /* map to a number between MIN_VIRT_IRQ and max_virt_irq */
         virq = real_irq;
-        if (virq > MAX_VIRT_IRQ)
-                virq = (virq % NR_VIRT_IRQS) + MIN_VIRT_IRQ;
+        if (virq > max_virt_irq)
+                virq = (virq % nr_virt_irqs) + MIN_VIRT_IRQ;
 
         /* search for this number or a free slot */
         first_virq = virq;
         while (virt_irq_to_real_map[virq] != UNDEFINED_IRQ) {
                 if (virt_irq_to_real_map[virq] == real_irq)
                         return virq;
-                if (++virq > MAX_VIRT_IRQ)
+                if (++virq > max_virt_irq)
                         virq = MIN_VIRT_IRQ;
                 if (virq == first_virq)
                         goto nospace;   /* oops, no free slots */
@@ -330,8 +338,8 @@ int virt_irq_create_mapping(unsigned int real_irq)
  nospace:
         if (!warned) {
                 printk(KERN_CRIT "Interrupt table is full\n");
-                printk(KERN_CRIT "Increase NR_IRQS (currently %d) "
-                       "in your kernel sources and rebuild.\n", NR_IRQS);
+                printk(KERN_CRIT "Increase virt_irq_max (currently %d) "
+                       "in your kernel sources and rebuild.\n", virt_irq_max);
                 warned = 1;
         }
         return NO_IRQ;
@@ -349,8 +357,8 @@ unsigned int real_irq_to_virt_slowpath(unsigned int real_irq)
 
         virq = real_irq;
 
-        if (virq > MAX_VIRT_IRQ)
-                virq = (virq % NR_VIRT_IRQS) + MIN_VIRT_IRQ;
+        if (virq > max_virt_irq)
+                virq = (virq % nr_virt_irqs) + MIN_VIRT_IRQ;
 
         first_virq = virq;
 
@@ -360,7 +368,7 @@ unsigned int real_irq_to_virt_slowpath(unsigned int real_irq)
 
                 virq++;
 
-                if (virq >= MAX_VIRT_IRQ)
+                if (virq >= max_virt_irq)
                         virq = 0;
 
         } while (first_virq != virq);
diff --git a/arch/powerpc/kernel/kprobes.c b/arch/powerpc/kernel/kprobes.c
index ad7a90212204..856ef1a832b9 100644
--- a/arch/powerpc/kernel/kprobes.c
+++ b/arch/powerpc/kernel/kprobes.c
@@ -88,7 +88,7 @@ void __kprobes arch_remove_kprobe(struct kprobe *p)
         mutex_unlock(&kprobe_mutex);
 }
 
-static inline void prepare_singlestep(struct kprobe *p, struct pt_regs *regs)
+static void __kprobes prepare_singlestep(struct kprobe *p, struct pt_regs *regs)
 {
         kprobe_opcode_t insn = *p->ainsn.insn;
 
@@ -101,21 +101,21 @@ static inline void prepare_singlestep(struct kprobe *p, struct pt_regs *regs)
                 regs->nip = (unsigned long)p->ainsn.insn;
 }
 
-static inline void save_previous_kprobe(struct kprobe_ctlblk *kcb)
+static void __kprobes save_previous_kprobe(struct kprobe_ctlblk *kcb)
 {
         kcb->prev_kprobe.kp = kprobe_running();
         kcb->prev_kprobe.status = kcb->kprobe_status;
         kcb->prev_kprobe.saved_msr = kcb->kprobe_saved_msr;
 }
 
-static inline void restore_previous_kprobe(struct kprobe_ctlblk *kcb)
+static void __kprobes restore_previous_kprobe(struct kprobe_ctlblk *kcb)
 {
         __get_cpu_var(current_kprobe) = kcb->prev_kprobe.kp;
         kcb->kprobe_status = kcb->prev_kprobe.status;
         kcb->kprobe_saved_msr = kcb->prev_kprobe.saved_msr;
 }
 
-static inline void set_current_kprobe(struct kprobe *p, struct pt_regs *regs,
+static void __kprobes set_current_kprobe(struct kprobe *p, struct pt_regs *regs,
                                 struct kprobe_ctlblk *kcb)
 {
         __get_cpu_var(current_kprobe) = p;
@@ -141,7 +141,7 @@ void __kprobes arch_prepare_kretprobe(struct kretprobe *rp,
         }
 }
 
-static inline int kprobe_handler(struct pt_regs *regs)
+static int __kprobes kprobe_handler(struct pt_regs *regs)
 {
         struct kprobe *p;
         int ret = 0;
@@ -334,7 +334,7 @@ static void __kprobes resume_execution(struct kprobe *p, struct pt_regs *regs)
                 regs->nip = (unsigned long)p->addr + 4;
 }
 
-static inline int post_kprobe_handler(struct pt_regs *regs)
+static int __kprobes post_kprobe_handler(struct pt_regs *regs)
 {
         struct kprobe *cur = kprobe_running();
         struct kprobe_ctlblk *kcb = get_kprobe_ctlblk();
@@ -370,7 +370,7 @@ out:
         return 1;
 }
 
-static inline int kprobe_fault_handler(struct pt_regs *regs, int trapnr)
+static int __kprobes kprobe_fault_handler(struct pt_regs *regs, int trapnr)
 {
         struct kprobe *cur = kprobe_running();
         struct kprobe_ctlblk *kcb = get_kprobe_ctlblk();
diff --git a/arch/powerpc/kernel/prom_init.c b/arch/powerpc/kernel/prom_init.c
index d66c5e77fcff..7e4d54821a07 100644
--- a/arch/powerpc/kernel/prom_init.c
+++ b/arch/powerpc/kernel/prom_init.c
@@ -1528,12 +1528,11 @@ static int __init prom_find_machine_type(void)
          *    non-IBM designs !
          *  - it has /rtas
          */
-        len = prom_getprop(_prom->root, "model",
+        len = prom_getprop(_prom->root, "device_type",
                            compat, sizeof(compat)-1);
         if (len <= 0)
                 return PLATFORM_GENERIC;
-        compat[len] = 0;
-        if (strcmp(compat, "chrp"))
+        if (strncmp(compat, RELOC("chrp"), 4))
                 return PLATFORM_GENERIC;
 
         /* Default to pSeries. We need to know if we are running LPAR */
diff --git a/arch/powerpc/kernel/rtas-proc.c b/arch/powerpc/kernel/rtas-proc.c
index 456286cf1d14..9c9ad1fa9cce 100644
--- a/arch/powerpc/kernel/rtas-proc.c
+++ b/arch/powerpc/kernel/rtas-proc.c
@@ -258,11 +258,11 @@ static int __init proc_rtas_init(void)
         struct proc_dir_entry *entry;
 
         if (!machine_is(pseries))
-                return 1;
+                return -ENODEV;
 
         rtas_node = of_find_node_by_name(NULL, "rtas");
         if (rtas_node == NULL)
-                return 1;
+                return -ENODEV;
 
         entry = create_proc_entry("ppc64/rtas/progress", S_IRUGO|S_IWUSR, NULL);
         if (entry)
diff --git a/arch/powerpc/platforms/cell/spufs/switch.c b/arch/powerpc/platforms/cell/spufs/switch.c
index 97898d5d34e5..1726bfe38ee0 100644
--- a/arch/powerpc/platforms/cell/spufs/switch.c
+++ b/arch/powerpc/platforms/cell/spufs/switch.c
@@ -1297,7 +1297,7 @@ static inline void setup_decr(struct spu_state *csa, struct spu *spu)
                 cycles_t resume_time = get_cycles();
                 cycles_t delta_time = resume_time - csa->suspend_time;
 
-                csa->lscsa->decr.slot[0] = delta_time;
+                csa->lscsa->decr.slot[0] -= delta_time;
         }
 }
 
diff --git a/arch/powerpc/platforms/chrp/chrp.h b/arch/powerpc/platforms/chrp/chrp.h
index 63f0aee4c158..996c28744e96 100644
--- a/arch/powerpc/platforms/chrp/chrp.h
+++ b/arch/powerpc/platforms/chrp/chrp.h
@@ -9,3 +9,4 @@ extern long chrp_time_init(void);
 
 extern void chrp_find_bridges(void);
 extern void chrp_event_scan(unsigned long);
+extern void chrp_pcibios_fixup(void);
diff --git a/arch/powerpc/platforms/chrp/pci.c b/arch/powerpc/platforms/chrp/pci.c
index 8ef279ad36ad..ac224876ce59 100644
--- a/arch/powerpc/platforms/chrp/pci.c
+++ b/arch/powerpc/platforms/chrp/pci.c
@@ -23,6 +23,8 @@
 #include <asm/grackle.h>
 #include <asm/rtas.h>
 
+#include "chrp.h"
+
 /* LongTrail */
 void __iomem *gg2_pci_config_base;
 
@@ -314,6 +316,6 @@ chrp_find_bridges(void)
         }
 
         /* Do not fixup interrupts from OF tree on pegasos */
-        if (is_pegasos == 0)
-                ppc_md.pcibios_fixup = chrp_pcibios_fixup;
+        if (is_pegasos)
+                ppc_md.pcibios_fixup = NULL;
 }
diff --git a/arch/powerpc/platforms/chrp/setup.c b/arch/powerpc/platforms/chrp/setup.c
index 23a201718704..18d89f38796b 100644
--- a/arch/powerpc/platforms/chrp/setup.c
+++ b/arch/powerpc/platforms/chrp/setup.c
@@ -440,8 +440,6 @@ void __init chrp_init_IRQ(void)
 
         if (_chrp_type == _CHRP_Pegasos)
                 ppc_md.get_irq        = i8259_irq;
-        else
-                ppc_md.get_irq        = mpic_get_irq;
 
 #if defined(CONFIG_VT) && defined(CONFIG_INPUT_ADBHID) && defined(XMON)
         /* see if there is a keyboard in the device tree
@@ -528,26 +526,24 @@ static int __init chrp_probe(void)
         /* Assume we have an 8259... */
         __irq_offset_value = NUM_ISA_INTERRUPTS;
 
-        ppc_md.setup_arch     = chrp_setup_arch;
-        ppc_md.show_cpuinfo   = chrp_show_cpuinfo;
-
-        ppc_md.init_IRQ       = chrp_init_IRQ;
-        ppc_md.init           = chrp_init2;
-
-        ppc_md.phys_mem_access_prot = pci_phys_mem_access_prot;
-
-        ppc_md.restart        = rtas_restart;
-        ppc_md.power_off      = rtas_power_off;
-        ppc_md.halt           = rtas_halt;
-
-        ppc_md.time_init      = chrp_time_init;
-        ppc_md.calibrate_decr = generic_calibrate_decr;
-
-        /* this may get overridden with rtas routines later... */
-        ppc_md.set_rtc_time   = chrp_set_rtc_time;
-        ppc_md.get_rtc_time   = chrp_get_rtc_time;
-
-#ifdef CONFIG_SMP
-        smp_ops = &chrp_smp_ops;
-#endif /* CONFIG_SMP */
+        return 1;
 }
+
+define_machine(chrp) {
+        .name                   = "CHRP",
+        .probe                  = chrp_probe,
+        .setup_arch             = chrp_setup_arch,
+        .init                   = chrp_init2,
+        .show_cpuinfo           = chrp_show_cpuinfo,
+        .init_IRQ               = chrp_init_IRQ,
+        .get_irq                = mpic_get_irq,
+        .pcibios_fixup          = chrp_pcibios_fixup,
+        .restart                = rtas_restart,
+        .power_off              = rtas_power_off,
+        .halt                   = rtas_halt,
+        .time_init              = chrp_time_init,
+        .set_rtc_time           = chrp_set_rtc_time,
+        .get_rtc_time           = chrp_get_rtc_time,
+        .calibrate_decr         = generic_calibrate_decr,
+        .phys_mem_access_prot   = pci_phys_mem_access_prot,
+};
diff --git a/arch/powerpc/platforms/iseries/setup.c b/arch/powerpc/platforms/iseries/setup.c
index 6ce8a404ba6b..a6fd9bedb074 100644
--- a/arch/powerpc/platforms/iseries/setup.c
+++ b/arch/powerpc/platforms/iseries/setup.c
@@ -54,6 +54,7 @@
 #include <asm/iseries/hv_lp_event.h>
 #include <asm/iseries/lpar_map.h>
 #include <asm/udbg.h>
+#include <asm/irq.h>
 
 #include "naca.h"
 #include "setup.h"
@@ -684,6 +685,12 @@ static int __init iseries_probe(void)
         powerpc_firmware_features |= FW_FEATURE_ISERIES;
         powerpc_firmware_features |= FW_FEATURE_LPAR;
 
+        /*
+         * The Hypervisor only allows us up to 256 interrupt
+         * sources (the irq number is passed in a u8).
+         */
+        virt_irq_max = 255;
+
         return 1;
 }
 
diff --git a/arch/powerpc/platforms/pseries/eeh.c b/arch/powerpc/platforms/pseries/eeh.c
index 780fb27a0099..32eaddfa5470 100644
--- a/arch/powerpc/platforms/pseries/eeh.c
+++ b/arch/powerpc/platforms/pseries/eeh.c
@@ -957,8 +957,10 @@ static void eeh_remove_device(struct pci_dev *dev)
         pci_addr_cache_remove_device(dev);
 
         dn = pci_device_to_OF_node(dev);
-        PCI_DN(dn)->pcidev = NULL;
-        pci_dev_put (dev);
+        if (PCI_DN(dn)->pcidev) {
+                PCI_DN(dn)->pcidev = NULL;
+                pci_dev_put (dev);
+        }
 }
 
 void eeh_remove_bus_device(struct pci_dev *dev)
diff --git a/arch/powerpc/platforms/pseries/rtasd.c b/arch/powerpc/platforms/pseries/rtasd.c
index fcc4d561a236..e0000ce769e5 100644
--- a/arch/powerpc/platforms/pseries/rtasd.c
+++ b/arch/powerpc/platforms/pseries/rtasd.c
@@ -488,7 +488,7 @@ static int __init rtas_init(void)
         /* No RTAS */
         if (rtas_token("event-scan") == RTAS_UNKNOWN_SERVICE) {
                 printk(KERN_INFO "rtasd: no event-scan on system\n");
-                return 1;
+                return -ENODEV;
         }
 
         entry = create_proc_entry("ppc64/rtas/error_log", S_IRUSR, NULL);