From: David Gibson <david@gibson.dropbear.id.au>
Date: Thu, 12 Jan 2006 23:26:42 +0000 (+1100)
Subject: [PATCH] powerpc: Remove lppaca structure from the PACA
X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=3356bb9f7ba378a6e2709f9df95f4ea52111f4df;p=openwrt%2Fstaging%2Fblogic.git

[PATCH] powerpc: Remove lppaca structure from the PACA

At present the lppaca - the structure shared with the iSeries
hypervisor and phyp - is contained within the PACA, our own low-level
per-cpu structure.  This doesn't have to be so, the patch below
removes it, making a separate array of lppaca structures.

This saves approximately 500*NR_CPUS bytes of image size and kernel
memory, because we don't need aligning gap between the Linux and
hypervisor portions of every PACA.  On the other hand it means an
extra level of dereference in many accesses to the lppaca.

The patch also gets rid of several places where we assign the paca
address to a local variable for no particular reason.

Signed-off-by: David Gibson <dwg@au1.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
---

diff --git a/arch/powerpc/kernel/asm-offsets.c b/arch/powerpc/kernel/asm-offsets.c
index 56399c5c931a..840aad43a98b 100644
--- a/arch/powerpc/kernel/asm-offsets.c
+++ b/arch/powerpc/kernel/asm-offsets.c
@@ -135,7 +135,7 @@ int main(void)
 	DEFINE(PACA_EXMC, offsetof(struct paca_struct, exmc));
 	DEFINE(PACA_EXSLB, offsetof(struct paca_struct, exslb));
 	DEFINE(PACAEMERGSP, offsetof(struct paca_struct, emergency_sp));
-	DEFINE(PACALPPACA, offsetof(struct paca_struct, lppaca));
+	DEFINE(PACALPPACAPTR, offsetof(struct paca_struct, lppaca_ptr));
 	DEFINE(PACAHWCPUID, offsetof(struct paca_struct, hw_cpu_id));
 
 	DEFINE(LPPACASRR0, offsetof(struct lppaca, saved_srr0));
diff --git a/arch/powerpc/kernel/entry_64.S b/arch/powerpc/kernel/entry_64.S
index 4ba81e1b6bf1..542036318866 100644
--- a/arch/powerpc/kernel/entry_64.S
+++ b/arch/powerpc/kernel/entry_64.S
@@ -511,7 +511,8 @@ restore:
 	cmpdi	0,r5,0
 	beq	4f
 	/* Check for pending interrupts (iSeries) */
-	ld	r3,PACALPPACA+LPPACAANYINT(r13)
+	ld	r3,PACALPPACAPTR(r13)
+	ld	r3,LPPACAANYINT(r3)
 	cmpdi	r3,0
 	beq+	4f			/* skip do_IRQ if no interrupts */
 
diff --git a/arch/powerpc/kernel/head_64.S b/arch/powerpc/kernel/head_64.S
index b3718f3eb7b5..308268466342 100644
--- a/arch/powerpc/kernel/head_64.S
+++ b/arch/powerpc/kernel/head_64.S
@@ -255,8 +255,9 @@ exception_marker:
 
 #define EXCEPTION_PROLOG_ISERIES_2					\
 	mfmsr	r10;							\
-	ld	r11,PACALPPACA+LPPACASRR0(r13);				\
-	ld	r12,PACALPPACA+LPPACASRR1(r13);				\
+	ld	r12,PACALPPACAPTR(r13);					\
+	ld	r11,LPPACASRR0(r12);					\
+	ld	r12,LPPACASRR1(r12);					\
 	ori	r10,r10,MSR_RI;						\
 	mtmsrd	r10,1
 
@@ -635,7 +636,8 @@ data_access_slb_iSeries:
 	std	r12,PACA_EXSLB+EX_R12(r13)
 	mfspr	r10,SPRN_SPRG1
 	std	r10,PACA_EXSLB+EX_R13(r13)
-	ld	r12,PACALPPACA+LPPACASRR1(r13);
+	ld	r12,PACALPPACAPTR(r13)
+	ld	r12,LPPACASRR1(r12)
 	b	.slb_miss_realmode
 
 	STD_EXCEPTION_ISERIES(0x400, instruction_access, PACA_EXGEN)
@@ -645,7 +647,8 @@ instruction_access_slb_iSeries:
 	mtspr	SPRN_SPRG1,r13		/* save r13 */
 	mfspr	r13,SPRN_SPRG3		/* get paca address into r13 */
 	std	r3,PACA_EXSLB+EX_R3(r13)
-	ld	r3,PACALPPACA+LPPACASRR0(r13)	/* get SRR0 value */
+	ld	r3,PACALPPACAPTR(r13)
+	ld	r3,LPPACASRR0(r3)	/* get SRR0 value */
 	std	r9,PACA_EXSLB+EX_R9(r13)
 	mfcr	r9
 #ifdef __DISABLED__
@@ -657,7 +660,8 @@ instruction_access_slb_iSeries:
 	std	r12,PACA_EXSLB+EX_R12(r13)
 	mfspr	r10,SPRN_SPRG1
 	std	r10,PACA_EXSLB+EX_R13(r13)
-	ld	r12,PACALPPACA+LPPACASRR1(r13);
+	ld	r12,PACALPPACAPTR(r13)
+	ld	r12,LPPACASRR1(r12)
 	b	.slb_miss_realmode
 
 #ifdef __DISABLED__
@@ -746,7 +750,8 @@ iSeries_secondary_smp_loop:
 	.globl decrementer_iSeries_masked
 decrementer_iSeries_masked:
 	li	r11,1
-	stb	r11,PACALPPACA+LPPACADECRINT(r13)
+	ld	r12,PACALPPACAPTR(r13)
+	stb	r11,LPPACADECRINT(r12)
 	LOAD_REG_ADDRBASE(r12,tb_ticks_per_jiffy)
 	lwz	r12,ADDROFF(tb_ticks_per_jiffy)(r12)
 	mtspr	SPRN_DEC,r12
@@ -755,8 +760,9 @@ decrementer_iSeries_masked:
 	.globl hardware_interrupt_iSeries_masked
 hardware_interrupt_iSeries_masked:
 	mtcrf	0x80,r9		/* Restore regs */
-	ld	r11,PACALPPACA+LPPACASRR0(r13)
-	ld	r12,PACALPPACA+LPPACASRR1(r13)
+	ld	r12,PACALPPACAPTR(r13)
+	ld	r11,LPPACASRR0(r12)
+	ld	r12,LPPACASRR1(r12)
 	mtspr	SPRN_SRR0,r11
 	mtspr	SPRN_SRR1,r12
 	ld	r9,PACA_EXGEN+EX_R9(r13)
@@ -995,7 +1001,8 @@ _GLOBAL(slb_miss_realmode)
 	ld	r3,PACA_EXSLB+EX_R3(r13)
 	lwz	r9,PACA_EXSLB+EX_CCR(r13)	/* get saved CR */
 #ifdef CONFIG_PPC_ISERIES
-	ld	r11,PACALPPACA+LPPACASRR0(r13)	/* get SRR0 value */
+	ld	r11,PACALPPACAPTR(r13)
+	ld	r11,LPPACASRR0(r11)		/* get SRR0 value */
 #endif /* CONFIG_PPC_ISERIES */
 
 	mtlr	r10
diff --git a/arch/powerpc/kernel/irq.c b/arch/powerpc/kernel/irq.c
index 5651032d8706..d1fffce86df9 100644
--- a/arch/powerpc/kernel/irq.c
+++ b/arch/powerpc/kernel/irq.c
@@ -238,14 +238,10 @@ void do_IRQ(struct pt_regs *regs)
         irq_exit();
 
 #ifdef CONFIG_PPC_ISERIES
-	{
-		struct paca_struct *lpaca = get_paca();
-
-		if (lpaca->lppaca.int_dword.fields.decr_int) {
-			lpaca->lppaca.int_dword.fields.decr_int = 0;
-			/* Signal a fake decrementer interrupt */
-			timer_interrupt(regs);
-		}
+	if (get_lppaca()->int_dword.fields.decr_int) {
+		get_lppaca()->int_dword.fields.decr_int = 0;
+		/* Signal a fake decrementer interrupt */
+		timer_interrupt(regs);
 	}
 #endif
 }
diff --git a/arch/powerpc/kernel/lparcfg.c b/arch/powerpc/kernel/lparcfg.c
index 9dda16ccde78..1ae96a8ed7e2 100644
--- a/arch/powerpc/kernel/lparcfg.c
+++ b/arch/powerpc/kernel/lparcfg.c
@@ -55,15 +55,13 @@ static unsigned long get_purr(void)
 {
 	unsigned long sum_purr = 0;
 	int cpu;
-	struct paca_struct *lpaca;
 
 	for_each_cpu(cpu) {
-		lpaca = paca + cpu;
-		sum_purr += lpaca->lppaca.emulated_time_base;
+		sum_purr += lppaca[cpu].emulated_time_base;
 
 #ifdef PURR_DEBUG
 		printk(KERN_INFO "get_purr for cpu (%d) has value (%ld) \n",
-			cpu, lpaca->lppaca.emulated_time_base);
+			cpu, lppaca[cpu].emulated_time_base);
 #endif
 	}
 	return sum_purr;
@@ -79,12 +77,11 @@ static int lparcfg_data(struct seq_file *m, void *v)
 	unsigned long pool_id, lp_index;
 	int shared, entitled_capacity, max_entitled_capacity;
 	int processors, max_processors;
-	struct paca_struct *lpaca = get_paca();
 	unsigned long purr = get_purr();
 
 	seq_printf(m, "%s %s \n", MODULE_NAME, MODULE_VERS);
 
-	shared = (int)(lpaca->lppaca_ptr->shared_proc);
+	shared = (int)(get_lppaca()->shared_proc);
 	seq_printf(m, "serial_number=%c%c%c%c%c%c%c\n",
 		   e2a(xItExtVpdPanel.mfgID[2]),
 		   e2a(xItExtVpdPanel.mfgID[3]),
@@ -402,7 +399,7 @@ static int lparcfg_data(struct seq_file *m, void *v)
 			   (h_resource >> 0 * 8) & 0xffff);
 
 		/* pool related entries are apropriate for shared configs */
-		if (paca[0].lppaca.shared_proc) {
+		if (lppaca[0].shared_proc) {
 
 			h_pic(&pool_idle_time, &pool_procs);
 
@@ -451,7 +448,7 @@ static int lparcfg_data(struct seq_file *m, void *v)
 	seq_printf(m, "partition_potential_processors=%d\n",
 		   partition_potential_processors);
 
-	seq_printf(m, "shared_processor_mode=%d\n", paca[0].lppaca.shared_proc);
+	seq_printf(m, "shared_processor_mode=%d\n", lppaca[0].shared_proc);
 
 	return 0;
 }
diff --git a/arch/powerpc/kernel/paca.c b/arch/powerpc/kernel/paca.c
index 999bdd816769..5d1b708086bd 100644
--- a/arch/powerpc/kernel/paca.c
+++ b/arch/powerpc/kernel/paca.c
@@ -25,6 +25,28 @@
  * field correctly */
 extern unsigned long __toc_start;
 
+/*
+ * iSeries structure which the hypervisor knows about - this structure
+ * should not cross a page boundary.  The vpa_init/register_vpa call
+ * is now known to fail if the lppaca structure crosses a page
+ * boundary.  The lppaca is also used on POWER5 pSeries boxes.  The
+ * lppaca is 640 bytes long, and cannot readily change since the
+ * hypervisor knows its layout, so a 1kB alignment will suffice to
+ * ensure that it doesn't cross a page boundary.
+ */
+struct lppaca lppaca[] = {
+	[0 ... (NR_CPUS-1)] = {
+		.desc = 0xd397d781,	/* "LpPa" */
+		.size = sizeof(struct lppaca),
+		.dyn_proc_status = 2,
+		.decr_val = 0x00ff0000,
+		.fpregs_in_use = 1,
+		.end_of_quantum = 0xfffffffffffffffful,
+		.slb_count = 64,
+		.vmxregs_in_use = 0,
+	},
+};
+
 /* The Paca is an array with one entry per processor.  Each contains an
  * lppaca, which contains the information shared between the
  * hypervisor and Linux.
@@ -35,27 +57,17 @@ extern unsigned long __toc_start;
  * processor (not thread).
  */
 #define PACA_INIT_COMMON(number, start, asrr, asrv)			    \
+	.lppaca_ptr = &lppaca[number],					    \
 	.lock_token = 0x8000,						    \
 	.paca_index = (number),		/* Paca Index */		    \
 	.kernel_toc = (unsigned long)(&__toc_start) + 0x8000UL,		    \
 	.stab_real = (asrr), 		/* Real pointer to segment table */ \
 	.stab_addr = (asrv),		/* Virt pointer to segment table */ \
 	.cpu_start = (start),		/* Processor start */		    \
-	.hw_cpu_id = 0xffff,						    \
-	.lppaca = {							    \
-		.desc = 0xd397d781,	/* "LpPa" */			    \
-		.size = sizeof(struct lppaca),				    \
-		.dyn_proc_status = 2,					    \
-		.decr_val = 0x00ff0000,					    \
-		.fpregs_in_use = 1,					    \
-		.end_of_quantum = 0xfffffffffffffffful,			    \
-		.slb_count = 64,					    \
-		.vmxregs_in_use = 0,					    \
-	},								    \
+	.hw_cpu_id = 0xffff,
 
 #ifdef CONFIG_PPC_ISERIES
 #define PACA_INIT_ISERIES(number)					    \
-	.lppaca_ptr = &paca[number].lppaca,				    \
 	.reg_save_ptr = &iseries_reg_save[number],
 
 #define PACA_INIT(number)						    \
diff --git a/arch/powerpc/kernel/time.c b/arch/powerpc/kernel/time.c
index 56f50e91bddb..c4a294d657b9 100644
--- a/arch/powerpc/kernel/time.c
+++ b/arch/powerpc/kernel/time.c
@@ -431,7 +431,7 @@ void timer_interrupt(struct pt_regs * regs)
 	profile_tick(CPU_PROFILING, regs);
 
 #ifdef CONFIG_PPC_ISERIES
-	get_paca()->lppaca.int_dword.fields.decr_int = 0;
+	get_lppaca()->int_dword.fields.decr_int = 0;
 #endif
 
 	while ((ticks = tb_ticks_since(per_cpu(last_jiffy, cpu)))
diff --git a/arch/powerpc/lib/locks.c b/arch/powerpc/lib/locks.c
index 35bd03c41dd1..8362fa272ca5 100644
--- a/arch/powerpc/lib/locks.c
+++ b/arch/powerpc/lib/locks.c
@@ -28,15 +28,13 @@
 void __spin_yield(raw_spinlock_t *lock)
 {
 	unsigned int lock_value, holder_cpu, yield_count;
-	struct paca_struct *holder_paca;
 
 	lock_value = lock->slock;
 	if (lock_value == 0)
 		return;
 	holder_cpu = lock_value & 0xffff;
 	BUG_ON(holder_cpu >= NR_CPUS);
-	holder_paca = &paca[holder_cpu];
-	yield_count = holder_paca->lppaca.yield_count;
+	yield_count = lppaca[holder_cpu].yield_count;
 	if ((yield_count & 1) == 0)
 		return;		/* virtual cpu is currently running */
 	rmb();
@@ -60,15 +58,13 @@ void __rw_yield(raw_rwlock_t *rw)
 {
 	int lock_value;
 	unsigned int holder_cpu, yield_count;
-	struct paca_struct *holder_paca;
 
 	lock_value = rw->lock;
 	if (lock_value >= 0)
 		return;		/* no write lock at present */
 	holder_cpu = lock_value & 0xffff;
 	BUG_ON(holder_cpu >= NR_CPUS);
-	holder_paca = &paca[holder_cpu];
-	yield_count = holder_paca->lppaca.yield_count;
+	yield_count = lppaca[holder_cpu].yield_count;
 	if ((yield_count & 1) == 0)
 		return;		/* virtual cpu is currently running */
 	rmb();
diff --git a/arch/powerpc/platforms/iseries/irq.c b/arch/powerpc/platforms/iseries/irq.c
index 83442ea77476..be3fbfc24e6c 100644
--- a/arch/powerpc/platforms/iseries/irq.c
+++ b/arch/powerpc/platforms/iseries/irq.c
@@ -334,14 +334,12 @@ int __init iSeries_allocate_IRQ(HvBusNumber bus,
  */
 int iSeries_get_irq(struct pt_regs *regs)
 {
-	struct paca_struct *lpaca;
 	/* -2 means ignore this interrupt */
 	int irq = -2;
 
-	lpaca = get_paca();
 #ifdef CONFIG_SMP
-	if (lpaca->lppaca.int_dword.fields.ipi_cnt) {
-		lpaca->lppaca.int_dword.fields.ipi_cnt = 0;
+	if (get_lppaca()->int_dword.fields.ipi_cnt) {
+		get_lppaca()->int_dword.fields.ipi_cnt = 0;
 		iSeries_smp_message_recv(regs);
 	}
 #endif /* CONFIG_SMP */
diff --git a/arch/powerpc/platforms/iseries/misc.S b/arch/powerpc/platforms/iseries/misc.S
index dfe7aa1ba098..7641fc7e550a 100644
--- a/arch/powerpc/platforms/iseries/misc.S
+++ b/arch/powerpc/platforms/iseries/misc.S
@@ -44,7 +44,8 @@ _GLOBAL(local_irq_restore)
 	/* Check pending interrupts */
 	/*   A decrementer, IPI or PMC interrupt may have occurred
 	 *   while we were in the hypervisor (which enables) */
-	ld	r4,PACALPPACA+LPPACAANYINT(r13)
+	ld	r4,PACALPPACAPTR(r13)
+	ld	r4,LPPACAANYINT(r4)
 	cmpdi	r4,0
 	beqlr
 
diff --git a/arch/powerpc/platforms/iseries/setup.c b/arch/powerpc/platforms/iseries/setup.c
index c6bbe5c25107..3f8790146b00 100644
--- a/arch/powerpc/platforms/iseries/setup.c
+++ b/arch/powerpc/platforms/iseries/setup.c
@@ -538,7 +538,7 @@ static unsigned long __init build_iSeries_Memory_Map(void)
  */
 static void __init iSeries_setup_arch(void)
 {
-	if (get_paca()->lppaca.shared_proc) {
+	if (get_lppaca()->shared_proc) {
 		ppc_md.idle_loop = iseries_shared_idle;
 		printk(KERN_INFO "Using shared processor idle loop\n");
 	} else {
@@ -647,7 +647,7 @@ static void yield_shared_processor(void)
 	 * The decrementer stops during the yield.  Force a fake decrementer
 	 * here and let the timer_interrupt code sort out the actual time.
 	 */
-	get_paca()->lppaca.int_dword.fields.decr_int = 1;
+	get_lppaca()->int_dword.fields.decr_int = 1;
 	process_iSeries_events();
 }
 
@@ -883,7 +883,7 @@ void dt_cpus(struct iseries_flat_dt *dt)
 	pft_size[1] = __ilog2(HvCallHpt_getHptPages() * HW_PAGE_SIZE);
 
 	for (i = 0; i < NR_CPUS; i++) {
-		if (paca[i].lppaca.dyn_proc_status >= 2)
+		if (lppaca[i].dyn_proc_status >= 2)
 			continue;
 
 		snprintf(p, 32 - (p - buf), "@%d", i);
@@ -891,7 +891,7 @@ void dt_cpus(struct iseries_flat_dt *dt)
 
 		dt_prop_str(dt, "device_type", "cpu");
 
-		index = paca[i].lppaca.dyn_hv_phys_proc_index;
+		index = lppaca[i].dyn_hv_phys_proc_index;
 		d = &xIoHriProcessorVpd[index];
 
 		dt_prop_u32(dt, "i-cache-size", d->xInstCacheSize * 1024);
diff --git a/arch/powerpc/platforms/iseries/smp.c b/arch/powerpc/platforms/iseries/smp.c
index fcb094ec6aec..6f9d407a709f 100644
--- a/arch/powerpc/platforms/iseries/smp.c
+++ b/arch/powerpc/platforms/iseries/smp.c
@@ -91,7 +91,7 @@ static void smp_iSeries_kick_cpu(int nr)
 	BUG_ON((nr < 0) || (nr >= NR_CPUS));
 
 	/* Verify that our partition has a processor nr */
-	if (paca[nr].lppaca.dyn_proc_status >= 2)
+	if (lppaca[nr].dyn_proc_status >= 2)
 		return;
 
 	/* The processor is currently spinning, waiting
diff --git a/arch/powerpc/platforms/pseries/lpar.c b/arch/powerpc/platforms/pseries/lpar.c
index 1fe445ab78a6..8952528d31ac 100644
--- a/arch/powerpc/platforms/pseries/lpar.c
+++ b/arch/powerpc/platforms/pseries/lpar.c
@@ -254,11 +254,11 @@ out:
 void vpa_init(int cpu)
 {
 	int hwcpu = get_hard_smp_processor_id(cpu);
-	unsigned long vpa = __pa(&paca[cpu].lppaca);
+	unsigned long vpa = __pa(&lppaca[cpu]);
 	long ret;
 
 	if (cpu_has_feature(CPU_FTR_ALTIVEC))
-		paca[cpu].lppaca.vmxregs_in_use = 1;
+		lppaca[cpu].vmxregs_in_use = 1;
 
 	ret = register_vpa(hwcpu, vpa);
 
diff --git a/arch/powerpc/platforms/pseries/setup.c b/arch/powerpc/platforms/pseries/setup.c
index 68b7f086d63d..da6cebaf72cd 100644
--- a/arch/powerpc/platforms/pseries/setup.c
+++ b/arch/powerpc/platforms/pseries/setup.c
@@ -190,7 +190,7 @@ static void pseries_lpar_enable_pmcs(void)
 
 	/* instruct hypervisor to maintain PMCs */
 	if (firmware_has_feature(FW_FEATURE_SPLPAR))
-		get_paca()->lppaca.pmcregs_in_use = 1;
+		get_lppaca()->pmcregs_in_use = 1;
 }
 
 static void __init pSeries_setup_arch(void)
@@ -234,7 +234,7 @@ static void __init pSeries_setup_arch(void)
 	/* Choose an idle loop */
 	if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
 		vpa_init(boot_cpuid);
-		if (get_paca()->lppaca.shared_proc) {
+		if (get_lppaca()->shared_proc) {
 			printk(KERN_INFO "Using shared processor idle loop\n");
 			ppc_md.idle_loop = pseries_shared_idle;
 		} else {
@@ -444,10 +444,10 @@ DECLARE_PER_CPU(unsigned long, smt_snooze_delay);
 
 static inline void dedicated_idle_sleep(unsigned int cpu)
 {
-	struct paca_struct *ppaca = &paca[cpu ^ 1];
+	struct lppaca *plppaca = &lppaca[cpu ^ 1];
 
 	/* Only sleep if the other thread is not idle */
-	if (!(ppaca->lppaca.idle)) {
+	if (!(plppaca->idle)) {
 		local_irq_disable();
 
 		/*
@@ -480,7 +480,6 @@ static inline void dedicated_idle_sleep(unsigned int cpu)
 
 static void pseries_dedicated_idle(void)
 { 
-	struct paca_struct *lpaca = get_paca();
 	unsigned int cpu = smp_processor_id();
 	unsigned long start_snooze;
 	unsigned long *smt_snooze_delay = &__get_cpu_var(smt_snooze_delay);
@@ -491,7 +490,7 @@ static void pseries_dedicated_idle(void)
 		 * Indicate to the HV that we are idle. Now would be
 		 * a good time to find other work to dispatch.
 		 */
-		lpaca->lppaca.idle = 1;
+		get_lppaca()->idle = 1;
 
 		if (!need_resched()) {
 			start_snooze = get_tb() +
@@ -518,7 +517,7 @@ static void pseries_dedicated_idle(void)
 			HMT_medium();
 		}
 
-		lpaca->lppaca.idle = 0;
+		get_lppaca()->idle = 0;
 		ppc64_runlatch_on();
 
 		preempt_enable_no_resched();
@@ -532,7 +531,6 @@ static void pseries_dedicated_idle(void)
 
 static void pseries_shared_idle(void)
 {
-	struct paca_struct *lpaca = get_paca();
 	unsigned int cpu = smp_processor_id();
 
 	while (1) {
@@ -540,7 +538,7 @@ static void pseries_shared_idle(void)
 		 * Indicate to the HV that we are idle. Now would be
 		 * a good time to find other work to dispatch.
 		 */
-		lpaca->lppaca.idle = 1;
+		get_lppaca()->idle = 1;
 
 		while (!need_resched() && !cpu_is_offline(cpu)) {
 			local_irq_disable();
@@ -564,7 +562,7 @@ static void pseries_shared_idle(void)
 			HMT_medium();
 		}
 
-		lpaca->lppaca.idle = 0;
+		get_lppaca()->idle = 0;
 		ppc64_runlatch_on();
 
 		preempt_enable_no_resched();
@@ -588,7 +586,7 @@ static void pseries_kexec_cpu_down(int crash_shutdown, int secondary)
 {
 	/* Don't risk a hypervisor call if we're crashing */
 	if (!crash_shutdown) {
-		unsigned long vpa = __pa(&get_paca()->lppaca);
+		unsigned long vpa = __pa(get_lppaca());
 
 		if (unregister_vpa(hard_smp_processor_id(), vpa)) {
 			printk("VPA deregistration of cpu %u (hw_cpu_id %d) "
diff --git a/include/asm-powerpc/lppaca.h b/include/asm-powerpc/lppaca.h
index ff82ea7c4829..cd9f11f1ef14 100644
--- a/include/asm-powerpc/lppaca.h
+++ b/include/asm-powerpc/lppaca.h
@@ -29,7 +29,9 @@
 //----------------------------------------------------------------------------
 #include <asm/types.h>
 
-struct lppaca {
+/* The Hypervisor barfs if the lppaca crosses a page boundary.  A 1k
+ * alignment is sufficient to prevent this */
+struct __attribute__((__aligned__(0x400))) lppaca {
 //=============================================================================
 // CACHE_LINE_1 0x0000 - 0x007F Contains read-only data
 // NOTE: The xDynXyz fields are fields that will be dynamically changed by
@@ -129,5 +131,7 @@ struct lppaca {
 	u8	pmc_save_area[256];	// PMC interrupt Area           x00-xFF
 };
 
+extern struct lppaca lppaca[];
+
 #endif /* __KERNEL__ */
 #endif /* _ASM_POWERPC_LPPACA_H */
diff --git a/include/asm-powerpc/paca.h b/include/asm-powerpc/paca.h
index a64b4d425dab..c9add8f1ad94 100644
--- a/include/asm-powerpc/paca.h
+++ b/include/asm-powerpc/paca.h
@@ -23,6 +23,7 @@
 
 register struct paca_struct *local_paca asm("r13");
 #define get_paca()	local_paca
+#define get_lppaca()	(get_paca()->lppaca_ptr)
 
 struct task_struct;
 
@@ -95,19 +96,6 @@ struct paca_struct {
 	u64 saved_r1;			/* r1 save for RTAS calls */
 	u64 saved_msr;			/* MSR saved here by enter_rtas */
 	u8 proc_enabled;		/* irq soft-enable flag */
-
-	/*
-	 * iSeries structure which the hypervisor knows about -
-	 * this structure should not cross a page boundary.
-	 * The vpa_init/register_vpa call is now known to fail if the
-	 * lppaca structure crosses a page boundary.
-	 * The lppaca is also used on POWER5 pSeries boxes.
-	 * The lppaca is 640 bytes long, and cannot readily change
-	 * since the hypervisor knows its layout, so a 1kB
-	 * alignment will suffice to ensure that it doesn't
-	 * cross a page boundary.
-	 */
-	struct lppaca lppaca __attribute__((__aligned__(0x400)));
 };
 
 extern struct paca_struct paca[];
diff --git a/include/asm-powerpc/spinlock.h b/include/asm-powerpc/spinlock.h
index 754900901cd8..26b8744ed529 100644
--- a/include/asm-powerpc/spinlock.h
+++ b/include/asm-powerpc/spinlock.h
@@ -80,7 +80,7 @@ static int __inline__ __raw_spin_trylock(raw_spinlock_t *lock)
 
 #if defined(CONFIG_PPC_SPLPAR) || defined(CONFIG_PPC_ISERIES)
 /* We only yield to the hypervisor if we are in shared processor mode */
-#define SHARED_PROCESSOR (get_paca()->lppaca.shared_proc)
+#define SHARED_PROCESSOR (get_lppaca()->shared_proc)
 extern void __spin_yield(raw_spinlock_t *lock);
 extern void __rw_yield(raw_rwlock_t *lock);
 #else /* SPLPAR || ISERIES */
diff --git a/include/asm-powerpc/time.h b/include/asm-powerpc/time.h
index d9b86a17271b..baddc9ab57ad 100644
--- a/include/asm-powerpc/time.h
+++ b/include/asm-powerpc/time.h
@@ -175,11 +175,10 @@ static inline void set_dec(int val)
 	set_dec_cpu6(val);
 #else
 #ifdef CONFIG_PPC_ISERIES
-	struct paca_struct *lpaca = get_paca();
 	int cur_dec;
 
-	if (lpaca->lppaca.shared_proc) {
-		lpaca->lppaca.virtual_decr = val;
+	if (get_lppaca()->shared_proc) {
+		get_lppaca()->virtual_decr = val;
 		cur_dec = get_dec();
 		if (cur_dec > val)
 			HvCall_setVirtualDecr();