From b0d436c739b0d4afcdfe2e97d4d1ee41ea2db62e Mon Sep 17 00:00:00 2001
From: Anton Blanchard <anton@samba.org>
Date: Wed, 7 Aug 2013 02:01:24 +1000
Subject: powerpc: Fix a number of sparse warnings

Address some of the trivial sparse warnings in arch/powerpc.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
---
 arch/powerpc/mm/hash_utils_64.c | 2 +-
 arch/powerpc/mm/subpage-prot.c  | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

(limited to 'arch/powerpc/mm')

diff --git a/arch/powerpc/mm/hash_utils_64.c b/arch/powerpc/mm/hash_utils_64.c
index 6ecc38bd5b24..bde8b5589755 100644
--- a/arch/powerpc/mm/hash_utils_64.c
+++ b/arch/powerpc/mm/hash_utils_64.c
@@ -907,7 +907,7 @@ static int subpage_protection(struct mm_struct *mm, unsigned long ea)
 
 	if (ea >= spt->maxaddr)
 		return 0;
-	if (ea < 0x100000000) {
+	if (ea < 0x100000000UL) {
 		/* addresses below 4GB use spt->low_prot */
 		sbpm = spt->low_prot;
 	} else {
diff --git a/arch/powerpc/mm/subpage-prot.c b/arch/powerpc/mm/subpage-prot.c
index aa74acb0fdfc..a770df2dae70 100644
--- a/arch/powerpc/mm/subpage-prot.c
+++ b/arch/powerpc/mm/subpage-prot.c
@@ -105,7 +105,7 @@ static void subpage_prot_clear(unsigned long addr, unsigned long len)
 		limit = spt->maxaddr;
 	for (; addr < limit; addr = next) {
 		next = pmd_addr_end(addr, limit);
-		if (addr < 0x100000000) {
+		if (addr < 0x100000000UL) {
 			spm = spt->low_prot;
 		} else {
 			spm = spt->protptrs[addr >> SBP_L3_SHIFT];
@@ -219,7 +219,7 @@ long sys_subpage_prot(unsigned long addr, unsigned long len, u32 __user *map)
 	for (limit = addr + len; addr < limit; addr = next) {
 		next = pmd_addr_end(addr, limit);
 		err = -ENOMEM;
-		if (addr < 0x100000000) {
+		if (addr < 0x100000000UL) {
 			spm = spt->low_prot;
 		} else {
 			spm = spt->protptrs[addr >> SBP_L3_SHIFT];
-- 
cgit v1.2.3


From f13c13a005127b5dc5daaca190277a062d946e63 Mon Sep 17 00:00:00 2001
From: Anton Blanchard <anton@samba.org>
Date: Wed, 7 Aug 2013 02:01:26 +1000
Subject: powerpc: Stop using non-architected shared_proc field in lppaca

Although the shared_proc field in the lppaca works today, it is
not architected. A shared processor partition will always have a non
zero yield_count so use that instead. Create a wrapper so users
don't have to know about the details.

In order for older kernels to continue to work on KVM we need
to set the shared_proc bit. While here, remove the ugly bitfield.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
---
 arch/powerpc/include/asm/lppaca.h               | 18 ++++++++++++++----
 arch/powerpc/include/asm/spinlock.h             |  2 +-
 arch/powerpc/kernel/lparcfg.c                   |  5 +++--
 arch/powerpc/kvm/book3s_hv.c                    |  2 +-
 arch/powerpc/mm/numa.c                          |  2 +-
 arch/powerpc/platforms/pseries/hotplug-cpu.c    |  4 ++--
 arch/powerpc/platforms/pseries/processor_idle.c |  2 +-
 7 files changed, 23 insertions(+), 12 deletions(-)

(limited to 'arch/powerpc/mm')

diff --git a/arch/powerpc/include/asm/lppaca.h b/arch/powerpc/include/asm/lppaca.h
index 9b12f88d4adb..bc8def08d5d8 100644
--- a/arch/powerpc/include/asm/lppaca.h
+++ b/arch/powerpc/include/asm/lppaca.h
@@ -50,10 +50,8 @@ struct lppaca {
 
 	u32	desc;			/* Eye catcher 0xD397D781 */
 	u16	size;			/* Size of this struct */
-	u16	reserved1;
-	u16	reserved2:14;
-	u8	shared_proc:1;		/* Shared processor indicator */
-	u8	secondary_thread:1;	/* Secondary thread indicator */
+	u8	reserved1[3];
+	u8	__old_status;		/* Old status, including shared proc */
 	u8	reserved3[14];
 	volatile u32 dyn_hw_node_id;	/* Dynamic hardware node id */
 	volatile u32 dyn_hw_proc_id;	/* Dynamic hardware proc id */
@@ -107,6 +105,18 @@ extern struct lppaca lppaca[];
 
 #define lppaca_of(cpu)	(*paca[cpu].lppaca_ptr)
 
+/*
+ * Old kernels used a reserved bit in the VPA to determine if it was running
+ * in shared processor mode. New kernels look for a non zero yield count
+ * but KVM still needs to set the bit to keep the old stuff happy.
+ */
+#define LPPACA_OLD_SHARED_PROC		2
+
+static inline bool lppaca_shared_proc(struct lppaca *l)
+{
+	return l->yield_count != 0;
+}
+
 /*
  * SLB shadow buffer structure as defined in the PAPR.  The save_area
  * contains adjacent ESID and VSID pairs for each shadowed SLB.  The
diff --git a/arch/powerpc/include/asm/spinlock.h b/arch/powerpc/include/asm/spinlock.h
index 5b23f910ee57..7c345b6518db 100644
--- a/arch/powerpc/include/asm/spinlock.h
+++ b/arch/powerpc/include/asm/spinlock.h
@@ -96,7 +96,7 @@ static inline int arch_spin_trylock(arch_spinlock_t *lock)
 
 #if defined(CONFIG_PPC_SPLPAR)
 /* We only yield to the hypervisor if we are in shared processor mode */
-#define SHARED_PROCESSOR (local_paca->lppaca_ptr->shared_proc)
+#define SHARED_PROCESSOR (lppaca_shared_proc(local_paca->lppaca_ptr))
 extern void __spin_yield(arch_spinlock_t *lock);
 extern void __rw_yield(arch_rwlock_t *lock);
 #else /* SPLPAR */
diff --git a/arch/powerpc/kernel/lparcfg.c b/arch/powerpc/kernel/lparcfg.c
index d92f3871e9cf..e6024c2ed5c7 100644
--- a/arch/powerpc/kernel/lparcfg.c
+++ b/arch/powerpc/kernel/lparcfg.c
@@ -165,7 +165,7 @@ static void parse_ppp_data(struct seq_file *m)
 	           ppp_data.active_system_procs);
 
 	/* pool related entries are appropriate for shared configs */
-	if (lppaca_of(0).shared_proc) {
+	if (lppaca_shared_proc(get_lppaca())) {
 		unsigned long pool_idle_time, pool_procs;
 
 		seq_printf(m, "pool=%d\n", ppp_data.pool_num);
@@ -473,7 +473,8 @@ static int pseries_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", lppaca_of(0).shared_proc);
+	seq_printf(m, "shared_processor_mode=%d\n",
+		   lppaca_shared_proc(get_lppaca()));
 
 	seq_printf(m, "slb_size=%d\n", mmu_slb_size);
 
diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c
index 2efa9dde741a..cf39bf4f3c7d 100644
--- a/arch/powerpc/kvm/book3s_hv.c
+++ b/arch/powerpc/kvm/book3s_hv.c
@@ -217,7 +217,7 @@ struct kvm_vcpu *kvmppc_find_vcpu(struct kvm *kvm, int id)
 
 static void init_vpa(struct kvm_vcpu *vcpu, struct lppaca *vpa)
 {
-	vpa->shared_proc = 1;
+	vpa->__old_status |= LPPACA_OLD_SHARED_PROC;
 	vpa->yield_count = 1;
 }
 
diff --git a/arch/powerpc/mm/numa.c b/arch/powerpc/mm/numa.c
index 5850798826cd..501e32ca43b4 100644
--- a/arch/powerpc/mm/numa.c
+++ b/arch/powerpc/mm/numa.c
@@ -1609,7 +1609,7 @@ int start_topology_update(void)
 #endif
 		}
 	} else if (firmware_has_feature(FW_FEATURE_VPHN) &&
-		   get_lppaca()->shared_proc) {
+		   lppaca_shared_proc(get_lppaca())) {
 		if (!vphn_enabled) {
 			prrn_enabled = 0;
 			vphn_enabled = 1;
diff --git a/arch/powerpc/platforms/pseries/hotplug-cpu.c b/arch/powerpc/platforms/pseries/hotplug-cpu.c
index 217ca5c75b20..1e490cf63a0d 100644
--- a/arch/powerpc/platforms/pseries/hotplug-cpu.c
+++ b/arch/powerpc/platforms/pseries/hotplug-cpu.c
@@ -123,7 +123,7 @@ static void pseries_mach_cpu_die(void)
 		cede_latency_hint = 2;
 
 		get_lppaca()->idle = 1;
-		if (!get_lppaca()->shared_proc)
+		if (!lppaca_shared_proc(get_lppaca()))
 			get_lppaca()->donate_dedicated_cpu = 1;
 
 		while (get_preferred_offline_state(cpu) == CPU_STATE_INACTIVE) {
@@ -137,7 +137,7 @@ static void pseries_mach_cpu_die(void)
 
 		local_irq_disable();
 
-		if (!get_lppaca()->shared_proc)
+		if (!lppaca_shared_proc(get_lppaca()))
 			get_lppaca()->donate_dedicated_cpu = 0;
 		get_lppaca()->idle = 0;
 
diff --git a/arch/powerpc/platforms/pseries/processor_idle.c b/arch/powerpc/platforms/pseries/processor_idle.c
index 4644efa06941..92db881be27e 100644
--- a/arch/powerpc/platforms/pseries/processor_idle.c
+++ b/arch/powerpc/platforms/pseries/processor_idle.c
@@ -308,7 +308,7 @@ static int pseries_idle_probe(void)
 		return -EPERM;
 	}
 
-	if (get_lppaca()->shared_proc)
+	if (lppaca_shared_proc(get_lppaca()))
 		cpuidle_state_table = shared_states;
 	else
 		cpuidle_state_table = dedicated_states;
-- 
cgit v1.2.3


From 1f7bf028763cacf5a5674731e8f679c4718f2cfa Mon Sep 17 00:00:00 2001
From: Paul Mackerras <paulus@samba.org>
Date: Mon, 5 Aug 2013 14:11:23 +1000
Subject: powerpc: Implement __get_user_pages_fast()

Other architectures have a __get_user_pages_fast(), in addition to the
regular get_user_pages_fast(), which doesn't call get_user_pages() on
failure, and thus doesn't attempt to fault pages in or COW them.  The
generic KVM code uses __get_user_pages_fast() to detect whether a page
for which we have only requested read access is actually writable.

This provides an implementation of __get_user_pages_fast() by
splitting the existing get_user_pages_fast() in two.  With this, the
generic KVM code will get the right answer instead of always
considering such pages non-writable.

Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
---
 arch/powerpc/mm/gup.c | 37 +++++++++++++++++++++----------------
 1 file changed, 21 insertions(+), 16 deletions(-)

(limited to 'arch/powerpc/mm')

diff --git a/arch/powerpc/mm/gup.c b/arch/powerpc/mm/gup.c
index 49822d90ea96..6936547018b8 100644
--- a/arch/powerpc/mm/gup.c
+++ b/arch/powerpc/mm/gup.c
@@ -117,8 +117,8 @@ static int gup_pud_range(pgd_t pgd, unsigned long addr, unsigned long end,
 	return 1;
 }
 
-int get_user_pages_fast(unsigned long start, int nr_pages, int write,
-			struct page **pages)
+int __get_user_pages_fast(unsigned long start, int nr_pages, int write,
+			  struct page **pages)
 {
 	struct mm_struct *mm = current->mm;
 	unsigned long addr, len, end;
@@ -135,7 +135,7 @@ int get_user_pages_fast(unsigned long start, int nr_pages, int write,
 
 	if (unlikely(!access_ok(write ? VERIFY_WRITE : VERIFY_READ,
 					start, len)))
-		goto slow_irqon;
+		return 0;
 
 	pr_devel("  aligned: %lx .. %lx\n", start, end);
 
@@ -166,30 +166,35 @@ int get_user_pages_fast(unsigned long start, int nr_pages, int write,
 			 (void *)pgd_val(pgd));
 		next = pgd_addr_end(addr, end);
 		if (pgd_none(pgd))
-			goto slow;
+			break;
 		if (pgd_huge(pgd)) {
 			if (!gup_hugepte((pte_t *)pgdp, PGDIR_SIZE, addr, next,
 					 write, pages, &nr))
-				goto slow;
+				break;
 		} else if (is_hugepd(pgdp)) {
 			if (!gup_hugepd((hugepd_t *)pgdp, PGDIR_SHIFT,
 					addr, next, write, pages, &nr))
-				goto slow;
+				break;
 		} else if (!gup_pud_range(pgd, addr, next, write, pages, &nr))
-			goto slow;
+			break;
 	} while (pgdp++, addr = next, addr != end);
 
 	local_irq_enable();
 
-	VM_BUG_ON(nr != (end - start) >> PAGE_SHIFT);
 	return nr;
+}
 
-	{
-		int ret;
+int get_user_pages_fast(unsigned long start, int nr_pages, int write,
+			struct page **pages)
+{
+	struct mm_struct *mm = current->mm;
+	int nr, ret;
+
+	start &= PAGE_MASK;
+	nr = __get_user_pages_fast(start, nr_pages, write, pages);
+	ret = nr;
 
-slow:
-		local_irq_enable();
-slow_irqon:
+	if (nr < nr_pages) {
 		pr_devel("  slow path ! nr = %d\n", nr);
 
 		/* Try to get the remaining pages with get_user_pages */
@@ -198,7 +203,7 @@ slow_irqon:
 
 		down_read(&mm->mmap_sem);
 		ret = get_user_pages(current, mm, start,
-			(end - start) >> PAGE_SHIFT, write, 0, pages, NULL);
+				     nr_pages - nr, write, 0, pages, NULL);
 		up_read(&mm->mmap_sem);
 
 		/* Have to be a bit careful with return values */
@@ -208,9 +213,9 @@ slow_irqon:
 			else
 				ret += nr;
 		}
-
-		return ret;
 	}
+
+	return ret;
 }
 
 #endif /* __HAVE_ARCH_PTE_SPECIAL */
-- 
cgit v1.2.3


From b08a2a12e44eaec5024b2b969f4fcb98169d1ca3 Mon Sep 17 00:00:00 2001
From: Alistair Popple <alistair@popple.id.au>
Date: Wed, 7 Aug 2013 02:01:44 +1000
Subject: powerpc: Make NUMA device node code endian safe

The device tree is big endian so make sure we byteswap on little
endian. We assume any pHyp calls also return big endian results in
memory.

Signed-off-by: Alistair Popple <alistair@popple.id.au>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
---
 arch/powerpc/mm/numa.c | 100 +++++++++++++++++++++++++------------------------
 1 file changed, 52 insertions(+), 48 deletions(-)

(limited to 'arch/powerpc/mm')

diff --git a/arch/powerpc/mm/numa.c b/arch/powerpc/mm/numa.c
index 501e32ca43b4..c916127f10c3 100644
--- a/arch/powerpc/mm/numa.c
+++ b/arch/powerpc/mm/numa.c
@@ -58,7 +58,7 @@ static int form1_affinity;
 
 #define MAX_DISTANCE_REF_POINTS 4
 static int distance_ref_points_depth;
-static const unsigned int *distance_ref_points;
+static const __be32 *distance_ref_points;
 static int distance_lookup_table[MAX_NUMNODES][MAX_DISTANCE_REF_POINTS];
 
 /*
@@ -179,7 +179,7 @@ static void unmap_cpu_from_node(unsigned long cpu)
 #endif /* CONFIG_HOTPLUG_CPU || CONFIG_PPC_SPLPAR */
 
 /* must hold reference to node during call */
-static const int *of_get_associativity(struct device_node *dev)
+static const __be32 *of_get_associativity(struct device_node *dev)
 {
 	return of_get_property(dev, "ibm,associativity", NULL);
 }
@@ -189,9 +189,9 @@ static const int *of_get_associativity(struct device_node *dev)
  * it exists (the property exists only in kexec/kdump kernels,
  * added by kexec-tools)
  */
-static const u32 *of_get_usable_memory(struct device_node *memory)
+static const __be32 *of_get_usable_memory(struct device_node *memory)
 {
-	const u32 *prop;
+	const __be32 *prop;
 	u32 len;
 	prop = of_get_property(memory, "linux,drconf-usable-memory", &len);
 	if (!prop || len < sizeof(unsigned int))
@@ -219,7 +219,7 @@ int __node_distance(int a, int b)
 }
 
 static void initialize_distance_lookup_table(int nid,
-		const unsigned int *associativity)
+		const __be32 *associativity)
 {
 	int i;
 
@@ -227,29 +227,32 @@ static void initialize_distance_lookup_table(int nid,
 		return;
 
 	for (i = 0; i < distance_ref_points_depth; i++) {
-		distance_lookup_table[nid][i] =
-			associativity[distance_ref_points[i]];
+		const __be32 *entry;
+
+		entry = &associativity[be32_to_cpu(distance_ref_points[i])];
+		distance_lookup_table[nid][i] = of_read_number(entry, 1);
 	}
 }
 
 /* Returns nid in the range [0..MAX_NUMNODES-1], or -1 if no useful numa
  * info is found.
  */
-static int associativity_to_nid(const unsigned int *associativity)
+static int associativity_to_nid(const __be32 *associativity)
 {
 	int nid = -1;
 
 	if (min_common_depth == -1)
 		goto out;
 
-	if (associativity[0] >= min_common_depth)
-		nid = associativity[min_common_depth];
+	if (of_read_number(associativity, 1) >= min_common_depth)
+		nid = of_read_number(&associativity[min_common_depth], 1);
 
 	/* POWER4 LPAR uses 0xffff as invalid node */
 	if (nid == 0xffff || nid >= MAX_NUMNODES)
 		nid = -1;
 
-	if (nid > 0 && associativity[0] >= distance_ref_points_depth)
+	if (nid > 0 &&
+	    of_read_number(associativity, 1) >= distance_ref_points_depth)
 		initialize_distance_lookup_table(nid, associativity);
 
 out:
@@ -262,7 +265,7 @@ out:
 static int of_node_to_nid_single(struct device_node *device)
 {
 	int nid = -1;
-	const unsigned int *tmp;
+	const __be32 *tmp;
 
 	tmp = of_get_associativity(device);
 	if (tmp)
@@ -334,7 +337,7 @@ static int __init find_min_common_depth(void)
 	}
 
 	if (form1_affinity) {
-		depth = distance_ref_points[0];
+		depth = of_read_number(distance_ref_points, 1);
 	} else {
 		if (distance_ref_points_depth < 2) {
 			printk(KERN_WARNING "NUMA: "
@@ -342,7 +345,7 @@ static int __init find_min_common_depth(void)
 			goto err;
 		}
 
-		depth = distance_ref_points[1];
+		depth = of_read_number(&distance_ref_points[1], 1);
 	}
 
 	/*
@@ -376,12 +379,12 @@ static void __init get_n_mem_cells(int *n_addr_cells, int *n_size_cells)
 	of_node_put(memory);
 }
 
-static unsigned long read_n_cells(int n, const unsigned int **buf)
+static unsigned long read_n_cells(int n, const __be32 **buf)
 {
 	unsigned long result = 0;
 
 	while (n--) {
-		result = (result << 32) | **buf;
+		result = (result << 32) | of_read_number(*buf, 1);
 		(*buf)++;
 	}
 	return result;
@@ -391,17 +394,17 @@ static unsigned long read_n_cells(int n, const unsigned int **buf)
  * Read the next memblock list entry from the ibm,dynamic-memory property
  * and return the information in the provided of_drconf_cell structure.
  */
-static void read_drconf_cell(struct of_drconf_cell *drmem, const u32 **cellp)
+static void read_drconf_cell(struct of_drconf_cell *drmem, const __be32 **cellp)
 {
-	const u32 *cp;
+	const __be32 *cp;
 
 	drmem->base_addr = read_n_cells(n_mem_addr_cells, cellp);
 
 	cp = *cellp;
-	drmem->drc_index = cp[0];
-	drmem->reserved = cp[1];
-	drmem->aa_index = cp[2];
-	drmem->flags = cp[3];
+	drmem->drc_index = of_read_number(cp, 1);
+	drmem->reserved = of_read_number(&cp[1], 1);
+	drmem->aa_index = of_read_number(&cp[2], 1);
+	drmem->flags = of_read_number(&cp[3], 1);
 
 	*cellp = cp + 4;
 }
@@ -413,16 +416,16 @@ static void read_drconf_cell(struct of_drconf_cell *drmem, const u32 **cellp)
  * list entries followed by N memblock list entries.  Each memblock list entry
  * contains information as laid out in the of_drconf_cell struct above.
  */
-static int of_get_drconf_memory(struct device_node *memory, const u32 **dm)
+static int of_get_drconf_memory(struct device_node *memory, const __be32 **dm)
 {
-	const u32 *prop;
+	const __be32 *prop;
 	u32 len, entries;
 
 	prop = of_get_property(memory, "ibm,dynamic-memory", &len);
 	if (!prop || len < sizeof(unsigned int))
 		return 0;
 
-	entries = *prop++;
+	entries = of_read_number(prop++, 1);
 
 	/* Now that we know the number of entries, revalidate the size
 	 * of the property read in to ensure we have everything
@@ -440,7 +443,7 @@ static int of_get_drconf_memory(struct device_node *memory, const u32 **dm)
  */
 static u64 of_get_lmb_size(struct device_node *memory)
 {
-	const u32 *prop;
+	const __be32 *prop;
 	u32 len;
 
 	prop = of_get_property(memory, "ibm,lmb-size", &len);
@@ -453,7 +456,7 @@ static u64 of_get_lmb_size(struct device_node *memory)
 struct assoc_arrays {
 	u32	n_arrays;
 	u32	array_sz;
-	const u32 *arrays;
+	const __be32 *arrays;
 };
 
 /*
@@ -469,15 +472,15 @@ struct assoc_arrays {
 static int of_get_assoc_arrays(struct device_node *memory,
 			       struct assoc_arrays *aa)
 {
-	const u32 *prop;
+	const __be32 *prop;
 	u32 len;
 
 	prop = of_get_property(memory, "ibm,associativity-lookup-arrays", &len);
 	if (!prop || len < 2 * sizeof(unsigned int))
 		return -1;
 
-	aa->n_arrays = *prop++;
-	aa->array_sz = *prop++;
+	aa->n_arrays = of_read_number(prop++, 1);
+	aa->array_sz = of_read_number(prop++, 1);
 
 	/* Now that we know the number of arrays and size of each array,
 	 * revalidate the size of the property read in.
@@ -504,7 +507,7 @@ static int of_drconf_to_nid_single(struct of_drconf_cell *drmem,
 	    !(drmem->flags & DRCONF_MEM_AI_INVALID) &&
 	    drmem->aa_index < aa->n_arrays) {
 		index = drmem->aa_index * aa->array_sz + min_common_depth - 1;
-		nid = aa->arrays[index];
+		nid = of_read_number(&aa->arrays[index], 1);
 
 		if (nid == 0xffff || nid >= MAX_NUMNODES)
 			nid = default_nid;
@@ -595,7 +598,7 @@ static unsigned long __init numa_enforce_memory_limit(unsigned long start,
  * Reads the counter for a given entry in
  * linux,drconf-usable-memory property
  */
-static inline int __init read_usm_ranges(const u32 **usm)
+static inline int __init read_usm_ranges(const __be32 **usm)
 {
 	/*
 	 * For each lmb in ibm,dynamic-memory a corresponding
@@ -612,7 +615,7 @@ static inline int __init read_usm_ranges(const u32 **usm)
  */
 static void __init parse_drconf_memory(struct device_node *memory)
 {
-	const u32 *uninitialized_var(dm), *usm;
+	const __be32 *uninitialized_var(dm), *usm;
 	unsigned int n, rc, ranges, is_kexec_kdump = 0;
 	unsigned long lmb_size, base, size, sz;
 	int nid;
@@ -721,7 +724,7 @@ static int __init parse_numa_properties(void)
 		unsigned long size;
 		int nid;
 		int ranges;
-		const unsigned int *memcell_buf;
+		const __be32 *memcell_buf;
 		unsigned int len;
 
 		memcell_buf = of_get_property(memory,
@@ -1106,7 +1109,7 @@ early_param("numa", early_numa);
 static int hot_add_drconf_scn_to_nid(struct device_node *memory,
 				     unsigned long scn_addr)
 {
-	const u32 *dm;
+	const __be32 *dm;
 	unsigned int drconf_cell_cnt, rc;
 	unsigned long lmb_size;
 	struct assoc_arrays aa;
@@ -1159,7 +1162,7 @@ int hot_add_node_scn_to_nid(unsigned long scn_addr)
 	for_each_node_by_type(memory, "memory") {
 		unsigned long start, size;
 		int ranges;
-		const unsigned int *memcell_buf;
+		const __be32 *memcell_buf;
 		unsigned int len;
 
 		memcell_buf = of_get_property(memory, "reg", &len);
@@ -1232,7 +1235,7 @@ static u64 hot_add_drconf_memory_max(void)
         struct device_node *memory = NULL;
         unsigned int drconf_cell_cnt = 0;
         u64 lmb_size = 0;
-        const u32 *dm = 0;
+	const __be32 *dm = 0;
 
         memory = of_find_node_by_path("/ibm,dynamic-reconfiguration-memory");
         if (memory) {
@@ -1337,40 +1340,41 @@ static int update_cpu_associativity_changes_mask(void)
  * Convert the associativity domain numbers returned from the hypervisor
  * to the sequence they would appear in the ibm,associativity property.
  */
-static int vphn_unpack_associativity(const long *packed, unsigned int *unpacked)
+static int vphn_unpack_associativity(const long *packed, __be32 *unpacked)
 {
 	int i, nr_assoc_doms = 0;
-	const u16 *field = (const u16*) packed;
+	const __be16 *field = (const __be16 *) packed;
 
 #define VPHN_FIELD_UNUSED	(0xffff)
 #define VPHN_FIELD_MSB		(0x8000)
 #define VPHN_FIELD_MASK		(~VPHN_FIELD_MSB)
 
 	for (i = 1; i < VPHN_ASSOC_BUFSIZE; i++) {
-		if (*field == VPHN_FIELD_UNUSED) {
+		if (be16_to_cpup(field) == VPHN_FIELD_UNUSED) {
 			/* All significant fields processed, and remaining
 			 * fields contain the reserved value of all 1's.
 			 * Just store them.
 			 */
-			unpacked[i] = *((u32*)field);
+			unpacked[i] = *((__be32 *)field);
 			field += 2;
-		} else if (*field & VPHN_FIELD_MSB) {
+		} else if (be16_to_cpup(field) & VPHN_FIELD_MSB) {
 			/* Data is in the lower 15 bits of this field */
-			unpacked[i] = *field & VPHN_FIELD_MASK;
+			unpacked[i] = cpu_to_be32(
+				be16_to_cpup(field) & VPHN_FIELD_MASK);
 			field++;
 			nr_assoc_doms++;
 		} else {
 			/* Data is in the lower 15 bits of this field
 			 * concatenated with the next 16 bit field
 			 */
-			unpacked[i] = *((u32*)field);
+			unpacked[i] = *((__be32 *)field);
 			field += 2;
 			nr_assoc_doms++;
 		}
 	}
 
 	/* The first cell contains the length of the property */
-	unpacked[0] = nr_assoc_doms;
+	unpacked[0] = cpu_to_be32(nr_assoc_doms);
 
 	return nr_assoc_doms;
 }
@@ -1379,7 +1383,7 @@ static int vphn_unpack_associativity(const long *packed, unsigned int *unpacked)
  * Retrieve the new associativity information for a virtual processor's
  * home node.
  */
-static long hcall_vphn(unsigned long cpu, unsigned int *associativity)
+static long hcall_vphn(unsigned long cpu, __be32 *associativity)
 {
 	long rc;
 	long retbuf[PLPAR_HCALL9_BUFSIZE] = {0};
@@ -1393,7 +1397,7 @@ static long hcall_vphn(unsigned long cpu, unsigned int *associativity)
 }
 
 static long vphn_get_associativity(unsigned long cpu,
-					unsigned int *associativity)
+					__be32 *associativity)
 {
 	long rc;
 
@@ -1450,7 +1454,7 @@ int arch_update_cpu_topology(void)
 {
 	unsigned int cpu, sibling, changed = 0;
 	struct topology_update_data *updates, *ud;
-	unsigned int associativity[VPHN_ASSOC_BUFSIZE] = {0};
+	__be32 associativity[VPHN_ASSOC_BUFSIZE] = {0};
 	cpumask_t updated_cpus;
 	struct device *dev;
 	int weight, new_nid, i = 0;
-- 
cgit v1.2.3


From 7ffcf8ec26f4b94b95b1297131d223b121d951e5 Mon Sep 17 00:00:00 2001
From: Anton Blanchard <anton@samba.org>
Date: Wed, 7 Aug 2013 02:01:46 +1000
Subject: powerpc: Fix little endian lppaca, slb_shadow and dtl_entry

The lppaca, slb_shadow and dtl_entry hypervisor structures are
big endian, so we have to byte swap them in little endian builds.

LE KVM hosts will also need to be fixed but for now add an #error
to remind us.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
---
 arch/powerpc/include/asm/asm-compat.h           |  9 +++++++++
 arch/powerpc/include/asm/ppc_asm.h              |  3 ++-
 arch/powerpc/kernel/entry_64.S                  | 11 +++++++----
 arch/powerpc/kernel/lparcfg.c                   |  9 +++++----
 arch/powerpc/kernel/paca.c                      | 10 +++++-----
 arch/powerpc/kernel/time.c                      | 16 ++++++++--------
 arch/powerpc/kvm/book3s_64_slb.S                |  4 ++++
 arch/powerpc/kvm/book3s_hv_rmhandlers.S         |  4 ++++
 arch/powerpc/lib/locks.c                        |  4 ++--
 arch/powerpc/mm/fault.c                         |  6 +++++-
 arch/powerpc/mm/slb.c                           |  9 ++++++---
 arch/powerpc/platforms/pseries/dtl.c            |  2 +-
 arch/powerpc/platforms/pseries/lpar.c           |  2 +-
 arch/powerpc/platforms/pseries/processor_idle.c |  6 +++++-
 arch/powerpc/platforms/pseries/setup.c          |  2 +-
 15 files changed, 65 insertions(+), 32 deletions(-)

(limited to 'arch/powerpc/mm')

diff --git a/arch/powerpc/include/asm/asm-compat.h b/arch/powerpc/include/asm/asm-compat.h
index 6e82f5f9a6fd..4b237aa35660 100644
--- a/arch/powerpc/include/asm/asm-compat.h
+++ b/arch/powerpc/include/asm/asm-compat.h
@@ -32,6 +32,15 @@
 #define PPC_MTOCRF(FXM, RS) MTOCRF((FXM), RS)
 #define PPC_LR_STKOFF	16
 #define PPC_MIN_STKFRM	112
+
+#ifdef __BIG_ENDIAN__
+#define LDX_BE	stringify_in_c(ldx)
+#define STDX_BE	stringify_in_c(stdx)
+#else
+#define LDX_BE	stringify_in_c(ldbrx)
+#define STDX_BE	stringify_in_c(stdbrx)
+#endif
+
 #else /* 32-bit */
 
 /* operations for longs and pointers */
diff --git a/arch/powerpc/include/asm/ppc_asm.h b/arch/powerpc/include/asm/ppc_asm.h
index b5c85f18faee..4ebb4f8f4188 100644
--- a/arch/powerpc/include/asm/ppc_asm.h
+++ b/arch/powerpc/include/asm/ppc_asm.h
@@ -54,7 +54,8 @@ BEGIN_FW_FTR_SECTION;							\
 	/* from user - see if there are any DTL entries to process */	\
 	ld	r10,PACALPPACAPTR(r13);	/* get ptr to VPA */		\
 	ld	r11,PACA_DTL_RIDX(r13);	/* get log read index */	\
-	ld	r10,LPPACA_DTLIDX(r10);	/* get log write index */	\
+	addi	r10,r10,LPPACA_DTLIDX;					\
+	LDX_BE	r10,0,r10;		/* get log write index */	\
 	cmpd	cr1,r11,r10;						\
 	beq+	cr1,33f;						\
 	bl	.accumulate_stolen_time;				\
diff --git a/arch/powerpc/kernel/entry_64.S b/arch/powerpc/kernel/entry_64.S
index c1055a150b88..707fbfde1324 100644
--- a/arch/powerpc/kernel/entry_64.S
+++ b/arch/powerpc/kernel/entry_64.S
@@ -102,7 +102,8 @@ BEGIN_FW_FTR_SECTION
 	/* if from user, see if there are any DTL entries to process */
 	ld	r10,PACALPPACAPTR(r13)	/* get ptr to VPA */
 	ld	r11,PACA_DTL_RIDX(r13)	/* get log read index */
-	ld	r10,LPPACA_DTLIDX(r10)	/* get log write index */
+	addi	r10,r10,LPPACA_DTLIDX
+	LDX_BE	r10,0,r10		/* get log write index */
 	cmpd	cr1,r11,r10
 	beq+	cr1,33f
 	bl	.accumulate_stolen_time
@@ -531,9 +532,11 @@ END_MMU_FTR_SECTION_IFSET(MMU_FTR_1T_SEGMENT)
 	 */
 	ld	r9,PACA_SLBSHADOWPTR(r13)
 	li	r12,0
-	std	r12,SLBSHADOW_STACKESID(r9) /* Clear ESID */
-	std	r7,SLBSHADOW_STACKVSID(r9)  /* Save VSID */
-	std	r0,SLBSHADOW_STACKESID(r9)  /* Save ESID */
+	std	r12,SLBSHADOW_STACKESID(r9)	/* Clear ESID */
+	li	r12,SLBSHADOW_STACKVSID
+	STDX_BE	r7,r12,r9			/* Save VSID */
+	li	r12,SLBSHADOW_STACKESID
+	STDX_BE	r0,r12,r9			/* Save ESID */
 
 	/* No need to check for MMU_FTR_NO_SLBIE_B here, since when
 	 * we have 1TB segments, the only CPUs known to have the errata
diff --git a/arch/powerpc/kernel/lparcfg.c b/arch/powerpc/kernel/lparcfg.c
index e6024c2ed5c7..0204089ebdd4 100644
--- a/arch/powerpc/kernel/lparcfg.c
+++ b/arch/powerpc/kernel/lparcfg.c
@@ -387,8 +387,8 @@ static void pseries_cmo_data(struct seq_file *m)
 		return;
 
 	for_each_possible_cpu(cpu) {
-		cmo_faults += lppaca_of(cpu).cmo_faults;
-		cmo_fault_time += lppaca_of(cpu).cmo_fault_time;
+		cmo_faults += be64_to_cpu(lppaca_of(cpu).cmo_faults);
+		cmo_fault_time += be64_to_cpu(lppaca_of(cpu).cmo_fault_time);
 	}
 
 	seq_printf(m, "cmo_faults=%lu\n", cmo_faults);
@@ -406,8 +406,9 @@ static void splpar_dispatch_data(struct seq_file *m)
 	unsigned long dispatch_dispersions = 0;
 
 	for_each_possible_cpu(cpu) {
-		dispatches += lppaca_of(cpu).yield_count;
-		dispatch_dispersions += lppaca_of(cpu).dispersion_count;
+		dispatches += be32_to_cpu(lppaca_of(cpu).yield_count);
+		dispatch_dispersions +=
+			be32_to_cpu(lppaca_of(cpu).dispersion_count);
 	}
 
 	seq_printf(m, "dispatches=%lu\n", dispatches);
diff --git a/arch/powerpc/kernel/paca.c b/arch/powerpc/kernel/paca.c
index f8f24685f10a..3fc16e3beb9f 100644
--- a/arch/powerpc/kernel/paca.c
+++ b/arch/powerpc/kernel/paca.c
@@ -34,10 +34,10 @@ extern unsigned long __toc_start;
  */
 struct lppaca lppaca[] = {
 	[0 ... (NR_LPPACAS-1)] = {
-		.desc = 0xd397d781,	/* "LpPa" */
-		.size = sizeof(struct lppaca),
+		.desc = cpu_to_be32(0xd397d781),	/* "LpPa" */
+		.size = cpu_to_be16(sizeof(struct lppaca)),
 		.fpregs_in_use = 1,
-		.slb_count = 64,
+		.slb_count = cpu_to_be16(64),
 		.vmxregs_in_use = 0,
 		.page_ins = 0,
 	},
@@ -101,8 +101,8 @@ static inline void free_lppacas(void) { }
  */
 struct slb_shadow slb_shadow[] __cacheline_aligned = {
 	[0 ... (NR_CPUS-1)] = {
-		.persistent = SLB_NUM_BOLTED,
-		.buffer_length = sizeof(struct slb_shadow),
+		.persistent = cpu_to_be32(SLB_NUM_BOLTED),
+		.buffer_length = cpu_to_be32(sizeof(struct slb_shadow)),
 	},
 };
 
diff --git a/arch/powerpc/kernel/time.c b/arch/powerpc/kernel/time.c
index c863aa1f524a..b2bcd34f72d2 100644
--- a/arch/powerpc/kernel/time.c
+++ b/arch/powerpc/kernel/time.c
@@ -210,18 +210,18 @@ static u64 scan_dispatch_log(u64 stop_tb)
 	if (!dtl)
 		return 0;
 
-	if (i == vpa->dtl_idx)
+	if (i == be64_to_cpu(vpa->dtl_idx))
 		return 0;
-	while (i < vpa->dtl_idx) {
+	while (i < be64_to_cpu(vpa->dtl_idx)) {
 		if (dtl_consumer)
 			dtl_consumer(dtl, i);
-		dtb = dtl->timebase;
-		tb_delta = dtl->enqueue_to_dispatch_time +
-			dtl->ready_to_enqueue_time;
+		dtb = be64_to_cpu(dtl->timebase);
+		tb_delta = be32_to_cpu(dtl->enqueue_to_dispatch_time) +
+			be32_to_cpu(dtl->ready_to_enqueue_time);
 		barrier();
-		if (i + N_DISPATCH_LOG < vpa->dtl_idx) {
+		if (i + N_DISPATCH_LOG < be64_to_cpu(vpa->dtl_idx)) {
 			/* buffer has overflowed */
-			i = vpa->dtl_idx - N_DISPATCH_LOG;
+			i = be64_to_cpu(vpa->dtl_idx) - N_DISPATCH_LOG;
 			dtl = local_paca->dispatch_log + (i % N_DISPATCH_LOG);
 			continue;
 		}
@@ -269,7 +269,7 @@ static inline u64 calculate_stolen_time(u64 stop_tb)
 {
 	u64 stolen = 0;
 
-	if (get_paca()->dtl_ridx != get_paca()->lppaca_ptr->dtl_idx) {
+	if (get_paca()->dtl_ridx != be64_to_cpu(get_lppaca()->dtl_idx)) {
 		stolen = scan_dispatch_log(stop_tb);
 		get_paca()->system_time -= stolen;
 	}
diff --git a/arch/powerpc/kvm/book3s_64_slb.S b/arch/powerpc/kvm/book3s_64_slb.S
index 4f0caecc0f9d..4f12e8f0c718 100644
--- a/arch/powerpc/kvm/book3s_64_slb.S
+++ b/arch/powerpc/kvm/book3s_64_slb.S
@@ -17,6 +17,10 @@
  * Authors: Alexander Graf <agraf@suse.de>
  */
 
+#ifdef __LITTLE_ENDIAN__
+#error Need to fix SLB shadow accesses in little endian mode
+#endif
+
 #define SHADOW_SLB_ESID(num)	(SLBSHADOW_SAVEAREA + (num * 0x10))
 #define SHADOW_SLB_VSID(num)	(SLBSHADOW_SAVEAREA + (num * 0x10) + 0x8)
 #define UNBOLT_SLB_ENTRY(num) \
diff --git a/arch/powerpc/kvm/book3s_hv_rmhandlers.S b/arch/powerpc/kvm/book3s_hv_rmhandlers.S
index b02f91e4c70d..20e7fcdc4c95 100644
--- a/arch/powerpc/kvm/book3s_hv_rmhandlers.S
+++ b/arch/powerpc/kvm/book3s_hv_rmhandlers.S
@@ -29,6 +29,10 @@
 #include <asm/kvm_book3s_asm.h>
 #include <asm/mmu-hash64.h>
 
+#ifdef __LITTLE_ENDIAN__
+#error Need to fix lppaca and SLB shadow accesses in little endian mode
+#endif
+
 /*****************************************************************************
  *                                                                           *
  *        Real Mode handlers that need to be in the linear mapping           *
diff --git a/arch/powerpc/lib/locks.c b/arch/powerpc/lib/locks.c
index bb7cfecf2788..0c9c8d7d0734 100644
--- a/arch/powerpc/lib/locks.c
+++ b/arch/powerpc/lib/locks.c
@@ -32,7 +32,7 @@ void __spin_yield(arch_spinlock_t *lock)
 		return;
 	holder_cpu = lock_value & 0xffff;
 	BUG_ON(holder_cpu >= NR_CPUS);
-	yield_count = lppaca_of(holder_cpu).yield_count;
+	yield_count = be32_to_cpu(lppaca_of(holder_cpu).yield_count);
 	if ((yield_count & 1) == 0)
 		return;		/* virtual cpu is currently running */
 	rmb();
@@ -57,7 +57,7 @@ void __rw_yield(arch_rwlock_t *rw)
 		return;		/* no write lock at present */
 	holder_cpu = lock_value & 0xffff;
 	BUG_ON(holder_cpu >= NR_CPUS);
-	yield_count = lppaca_of(holder_cpu).yield_count;
+	yield_count = be32_to_cpu(lppaca_of(holder_cpu).yield_count);
 	if ((yield_count & 1) == 0)
 		return;		/* virtual cpu is currently running */
 	rmb();
diff --git a/arch/powerpc/mm/fault.c b/arch/powerpc/mm/fault.c
index 8726779e1409..76d8e7cc7805 100644
--- a/arch/powerpc/mm/fault.c
+++ b/arch/powerpc/mm/fault.c
@@ -443,8 +443,12 @@ good_area:
 				      regs, address);
 #ifdef CONFIG_PPC_SMLPAR
 			if (firmware_has_feature(FW_FEATURE_CMO)) {
+				u32 page_ins;
+
 				preempt_disable();
-				get_lppaca()->page_ins += (1 << PAGE_FACTOR);
+				page_ins = be32_to_cpu(get_lppaca()->page_ins);
+				page_ins += 1 << PAGE_FACTOR;
+				get_lppaca()->page_ins = cpu_to_be32(page_ins);
 				preempt_enable();
 			}
 #endif /* CONFIG_PPC_SMLPAR */
diff --git a/arch/powerpc/mm/slb.c b/arch/powerpc/mm/slb.c
index a538c80db2df..9d1d33cd2be5 100644
--- a/arch/powerpc/mm/slb.c
+++ b/arch/powerpc/mm/slb.c
@@ -66,8 +66,10 @@ static inline void slb_shadow_update(unsigned long ea, int ssize,
 	 * we only update the current CPU's SLB shadow buffer.
 	 */
 	get_slb_shadow()->save_area[entry].esid = 0;
-	get_slb_shadow()->save_area[entry].vsid = mk_vsid_data(ea, ssize, flags);
-	get_slb_shadow()->save_area[entry].esid = mk_esid_data(ea, ssize, entry);
+	get_slb_shadow()->save_area[entry].vsid =
+				cpu_to_be64(mk_vsid_data(ea, ssize, flags));
+	get_slb_shadow()->save_area[entry].esid =
+				cpu_to_be64(mk_esid_data(ea, ssize, entry));
 }
 
 static inline void slb_shadow_clear(unsigned long entry)
@@ -112,7 +114,8 @@ static void __slb_flush_and_rebolt(void)
 	} else {
 		/* Update stack entry; others don't change */
 		slb_shadow_update(get_paca()->kstack, mmu_kernel_ssize, lflags, 2);
-		ksp_vsid_data = get_slb_shadow()->save_area[2].vsid;
+		ksp_vsid_data =
+			be64_to_cpu(get_slb_shadow()->save_area[2].vsid);
 	}
 
 	/* We need to do this all in asm, so we're sure we don't touch
diff --git a/arch/powerpc/platforms/pseries/dtl.c b/arch/powerpc/platforms/pseries/dtl.c
index 0cc0ac07a55d..238240e02ef8 100644
--- a/arch/powerpc/platforms/pseries/dtl.c
+++ b/arch/powerpc/platforms/pseries/dtl.c
@@ -87,7 +87,7 @@ static void consume_dtle(struct dtl_entry *dtle, u64 index)
 	barrier();
 
 	/* check for hypervisor ring buffer overflow, ignore this entry if so */
-	if (index + N_DISPATCH_LOG < vpa->dtl_idx)
+	if (index + N_DISPATCH_LOG < be64_to_cpu(vpa->dtl_idx))
 		return;
 
 	++wp;
diff --git a/arch/powerpc/platforms/pseries/lpar.c b/arch/powerpc/platforms/pseries/lpar.c
index 60b6f4e8d63d..0b7c86e3d75d 100644
--- a/arch/powerpc/platforms/pseries/lpar.c
+++ b/arch/powerpc/platforms/pseries/lpar.c
@@ -106,7 +106,7 @@ void vpa_init(int cpu)
 		lppaca_of(cpu).dtl_idx = 0;
 
 		/* hypervisor reads buffer length from this field */
-		dtl->enqueue_to_dispatch_time = DISPATCH_LOG_BYTES;
+		dtl->enqueue_to_dispatch_time = cpu_to_be32(DISPATCH_LOG_BYTES);
 		ret = register_dtl(hwcpu, __pa(dtl));
 		if (ret)
 			pr_err("WARNING: DTL registration of cpu %d (hw %d) "
diff --git a/arch/powerpc/platforms/pseries/processor_idle.c b/arch/powerpc/platforms/pseries/processor_idle.c
index 92db881be27e..14899b1db1e9 100644
--- a/arch/powerpc/platforms/pseries/processor_idle.c
+++ b/arch/powerpc/platforms/pseries/processor_idle.c
@@ -45,7 +45,11 @@ static inline void idle_loop_prolog(unsigned long *in_purr)
 
 static inline void idle_loop_epilog(unsigned long in_purr)
 {
-	get_lppaca()->wait_state_cycles += mfspr(SPRN_PURR) - in_purr;
+	u64 wait_cycles;
+
+	wait_cycles = be64_to_cpu(get_lppaca()->wait_state_cycles);
+	wait_cycles += mfspr(SPRN_PURR) - in_purr;
+	get_lppaca()->wait_state_cycles = cpu_to_be64(wait_cycles);
 	get_lppaca()->idle = 0;
 }
 
diff --git a/arch/powerpc/platforms/pseries/setup.c b/arch/powerpc/platforms/pseries/setup.c
index b19cd8334630..33d619665cb7 100644
--- a/arch/powerpc/platforms/pseries/setup.c
+++ b/arch/powerpc/platforms/pseries/setup.c
@@ -323,7 +323,7 @@ static int alloc_dispatch_logs(void)
 	get_paca()->lppaca_ptr->dtl_idx = 0;
 
 	/* hypervisor reads buffer length from this field */
-	dtl->enqueue_to_dispatch_time = DISPATCH_LOG_BYTES;
+	dtl->enqueue_to_dispatch_time = cpu_to_be32(DISPATCH_LOG_BYTES);
 	ret = register_dtl(hard_smp_processor_id(), __pa(dtl));
 	if (ret)
 		pr_err("WARNING: DTL registration of cpu %d (hw %d) failed "
-- 
cgit v1.2.3


From f748edafac858404be6c8dd67160c2032d97ddf5 Mon Sep 17 00:00:00 2001
From: Nathan Fontenot <nfont@linux.vnet.ibm.com>
Date: Mon, 19 Aug 2013 21:52:20 -0500
Subject: powerpc/mm: Mark Memory Resources as busy

Memory I/O resources need to be marked as busy or else we cannot remove
them when doing memory hot remove.

Signed-off-by: Nathan Fontenot <nfont@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
---
 arch/powerpc/mm/mem.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'arch/powerpc/mm')

diff --git a/arch/powerpc/mm/mem.c b/arch/powerpc/mm/mem.c
index 7f4bea162026..1cf9c5b67f24 100644
--- a/arch/powerpc/mm/mem.c
+++ b/arch/powerpc/mm/mem.c
@@ -514,7 +514,7 @@ static int add_system_ram_resources(void)
 			res->name = "System RAM";
 			res->start = base;
 			res->end = base + size - 1;
-			res->flags = IORESOURCE_MEM;
+			res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
 			WARN_ON(request_resource(&iomem_resource, res) < 0);
 		}
 	}
-- 
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