powerpc: use sysfs_emit{_at} in sysfs show functions

Replace sprintf() with sysfs_emit() and sysfs_emit_at() in sysfs show
functions, which are preferred for formatting sysfs output because they
provide safer bounds checking.

While the current code only emits strings that fit easily within
PAGE_SIZE, use sysfs_emit() and sysfs_emit_at() to follow secure coding
best practices.

This is a mechanical cleanup with a few simple edge cases:

- In domains_show(), drop the redundant n < 0 check since neither
  sprintf() nor sysfs_emit() return negative values.

- In powercap_show() and psr_show(), also drop the dead ret < 0 checks.

- In ps3_fw_version_show(), normalize the output by adding a terminating
  newline as suggested by checkpatch.

- In vio's modalias_show(), replace the deprecated strcpy() [1] followed
  by strlen() with sysfs_emit().

Leave validate_show() and the variable-length hv-gpci helpers unchanged
since they already have explicit bounds handling, and converting those
would be more than a mechanical conversion.

[1] https://www.kernel.org/doc/html/latest/process/deprecated.html#strcpy

Signed-off-by: Thorsten Blum <thorsten.blum@linux.dev>
Reviewed-by: Christophe Leroy (CS GROUP) <chleroy@kernel.org>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20260524130002.793476-2-thorsten.blum@linux.dev

arch/powerpc/kernel/cacheinfo.c

@@ -18,6 +18,7 @@
 #include <linux/of.h>
 #include <linux/percpu.h>
 #include <linux/slab.h>
+#include <linux/sysfs.h>
 #include <asm/cputhreads.h>
 #include <asm/smp.h>
 
@@ -596,7 +597,7 @@ static ssize_t size_show(struct kobject *k, struct kobj_attribute *attr, char *b
 	if (cache_size_kb(cache, &size_kb))
 		return -ENODEV;
 
-	return sprintf(buf, "%uK\n", size_kb);
+	return sysfs_emit(buf, "%uK\n", size_kb);
 }
 
 static struct kobj_attribute cache_size_attr =
@@ -613,7 +614,7 @@ static ssize_t line_size_show(struct kobject *k, struct kobj_attribute *attr, ch
 	if (cache_get_line_size(cache, &line_size))
 		return -ENODEV;
 
-	return sprintf(buf, "%u\n", line_size);
+	return sysfs_emit(buf, "%u\n", line_size);
 }
 
 static struct kobj_attribute cache_line_size_attr =
@@ -629,7 +630,7 @@ static ssize_t nr_sets_show(struct kobject *k, struct kobj_attribute *attr, char
 	if (cache_nr_sets(cache, &nr_sets))
 		return -ENODEV;
 
-	return sprintf(buf, "%u\n", nr_sets);
+	return sysfs_emit(buf, "%u\n", nr_sets);
 }
 
 static struct kobj_attribute cache_nr_sets_attr =
@@ -645,7 +646,7 @@ static ssize_t associativity_show(struct kobject *k, struct kobj_attribute *attr
 	if (cache_associativity(cache, &associativity))
 		return -ENODEV;
 
-	return sprintf(buf, "%u\n", associativity);
+	return sysfs_emit(buf, "%u\n", associativity);
 }
 
 static struct kobj_attribute cache_assoc_attr =
@@ -657,7 +658,7 @@ static ssize_t type_show(struct kobject *k, struct kobj_attribute *attr, char *b
 
 	cache = index_kobj_to_cache(k);
 
-	return sprintf(buf, "%s\n", cache_type_string(cache));
+	return sysfs_emit(buf, "%s\n", cache_type_string(cache));
 }
 
 static struct kobj_attribute cache_type_attr =
@@ -671,7 +672,7 @@ static ssize_t level_show(struct kobject *k, struct kobj_attribute *attr, char *
 	index = kobj_to_cache_index_dir(k);
 	cache = index->cache;
 
-	return sprintf(buf, "%d\n", cache->level);
+	return sysfs_emit(buf, "%d\n", cache->level);
 }
 
 static struct kobj_attribute cache_level_attr =

arch/powerpc/kernel/eeh_sysfs.c

@@ -9,6 +9,7 @@
 #include <linux/of.h>
 #include <linux/pci.h>
 #include <linux/stat.h>
+#include <linux/sysfs.h>
 #include <asm/ppc-pci.h>
 #include <asm/pci-bridge.h>
 
@@ -31,7 +32,7 @@ static ssize_t eeh_show_##_name(struct device *dev,      \
 	if (!edev)                                            \
 		return 0;                                     \
 	                                                      \
-	return sprintf(buf, _format "\n", edev->_memb);       \
+	return sysfs_emit(buf, _format "\n", edev->_memb);    \
 }                                                        \
 static DEVICE_ATTR(_name, 0444, eeh_show_##_name, NULL);
 
@@ -49,8 +50,7 @@ static ssize_t eeh_pe_state_show(struct device *dev,
 		return -ENODEV;
 
 	state = eeh_ops->get_state(edev->pe, NULL);
-	return sprintf(buf, "0x%08x 0x%08x\n",
-		       state, edev->pe->state);
+	return sysfs_emit(buf, "0x%08x 0x%08x\n", state, edev->pe->state);
 }
 
 static ssize_t eeh_pe_state_store(struct device *dev,
@@ -87,7 +87,7 @@ static ssize_t eeh_notify_resume_show(struct device *dev,
 	if (!edev || !edev->pe)
 		return -ENODEV;
 
-	return sprintf(buf, "%d\n", pdn->last_allow_rc);
+	return sysfs_emit(buf, "%d\n", pdn->last_allow_rc);
 }
 
 static ssize_t eeh_notify_resume_store(struct device *dev,

arch/powerpc/kernel/fadump.c

@@ -1422,7 +1422,7 @@ static ssize_t enabled_show(struct kobject *kobj,
 			    struct kobj_attribute *attr,
 			    char *buf)
 {
-	return sprintf(buf, "%d\n", fw_dump.fadump_enabled);
+	return sysfs_emit(buf, "%d\n", fw_dump.fadump_enabled);
 }
 
 /*
@@ -1434,28 +1434,28 @@ static ssize_t hotplug_ready_show(struct kobject *kobj,
 				      struct kobj_attribute *attr,
 				      char *buf)
 {
-	return sprintf(buf, "%d\n", 1);
+	return sysfs_emit(buf, "%d\n", 1);
 }
 
 static ssize_t mem_reserved_show(struct kobject *kobj,
 				 struct kobj_attribute *attr,
 				 char *buf)
 {
-	return sprintf(buf, "%ld\n", fw_dump.reserve_dump_area_size);
+	return sysfs_emit(buf, "%ld\n", fw_dump.reserve_dump_area_size);
 }
 
 static ssize_t registered_show(struct kobject *kobj,
 			       struct kobj_attribute *attr,
 			       char *buf)
 {
-	return sprintf(buf, "%d\n", fw_dump.dump_registered);
+	return sysfs_emit(buf, "%d\n", fw_dump.dump_registered);
 }
 
 static ssize_t bootargs_append_show(struct kobject *kobj,
 				   struct kobj_attribute *attr,
 				   char *buf)
 {
-	return sprintf(buf, "%s\n", (char *)__va(fw_dump.param_area));
+	return sysfs_emit(buf, "%s\n", (char *)__va(fw_dump.param_area));
 }
 
 static ssize_t bootargs_append_store(struct kobject *kobj,

arch/powerpc/kernel/iommu.c

@@ -13,6 +13,7 @@
 #include <linux/init.h>
 #include <linux/types.h>
 #include <linux/slab.h>
+#include <linux/sysfs.h>
 #include <linux/mm.h>
 #include <linux/spinlock.h>
 #include <linux/string.h>
@@ -141,7 +142,7 @@ late_initcall(fail_iommu_debugfs);
 static ssize_t fail_iommu_show(struct device *dev,
 			       struct device_attribute *attr, char *buf)
 {
-	return sprintf(buf, "%d\n", dev->archdata.fail_iommu);
+	return sysfs_emit(buf, "%d\n", dev->archdata.fail_iommu);
 }
 
 static ssize_t fail_iommu_store(struct device *dev,

arch/powerpc/kernel/security.c

@@ -11,6 +11,7 @@
 #include <linux/nospec.h>
 #include <linux/prctl.h>
 #include <linux/seq_buf.h>
+#include <linux/sysfs.h>
 #include <linux/debugfs.h>
 
 #include <asm/asm-prototypes.h>
@@ -163,13 +164,13 @@ ssize_t cpu_show_meltdown(struct device *dev, struct device_attribute *attr, cha
 	}
 
 	if (thread_priv)
-		return sprintf(buf, "Vulnerable: L1D private per thread\n");
+		return sysfs_emit(buf, "Vulnerable: L1D private per thread\n");
 
 	if (!security_ftr_enabled(SEC_FTR_L1D_FLUSH_HV) &&
 	    !security_ftr_enabled(SEC_FTR_L1D_FLUSH_PR))
-		return sprintf(buf, "Not affected\n");
+		return sysfs_emit(buf, "Not affected\n");
 
-	return sprintf(buf, "Vulnerable\n");
+	return sysfs_emit(buf, "Vulnerable\n");
 }
 
 ssize_t cpu_show_l1tf(struct device *dev, struct device_attribute *attr, char *buf)
@@ -352,14 +353,14 @@ ssize_t cpu_show_spec_store_bypass(struct device *dev, struct device_attribute *
 		default:
 			type = "unknown";
 		}
-		return sprintf(buf, "Mitigation: Kernel entry/exit barrier (%s)\n", type);
+		return sysfs_emit(buf, "Mitigation: Kernel entry/exit barrier (%s)\n", type);
 	}
 
 	if (!security_ftr_enabled(SEC_FTR_L1D_FLUSH_HV) &&
 	    !security_ftr_enabled(SEC_FTR_L1D_FLUSH_PR))
-		return sprintf(buf, "Not affected\n");
+		return sysfs_emit(buf, "Not affected\n");
 
-	return sprintf(buf, "Vulnerable\n");
+	return sysfs_emit(buf, "Vulnerable\n");
 }
 
 static int ssb_prctl_get(struct task_struct *task)

arch/powerpc/kernel/sysfs.c

@@ -5,6 +5,7 @@
 #include <linux/percpu.h>
 #include <linux/init.h>
 #include <linux/sched.h>
+#include <linux/sysfs.h>
 #include <linux/export.h>
 #include <linux/nodemask.h>
 #include <linux/cpumask.h>
@@ -63,7 +64,7 @@ static ssize_t show_smt_snooze_delay(struct device *dev,
 {
 	pr_warn_once("%s (%d) read from unsupported smt_snooze_delay\n",
 		     current->comm, current->pid);
-	return sprintf(buf, "100\n");
+	return sysfs_emit(buf, "100\n");
 }
 
 static DEVICE_ATTR(smt_snooze_delay, 0644, show_smt_snooze_delay,
@@ -100,7 +101,7 @@ static ssize_t show_##NAME(struct device *dev, \
 	struct cpu *cpu = container_of(dev, struct cpu, dev); \
 	unsigned long val; \
 	smp_call_function_single(cpu->dev.id, read_##NAME, &val, 1);	\
-	return sprintf(buf, "%lx\n", val); \
+	return sysfs_emit(buf, "%lx\n", val); \
 } \
 static ssize_t __used \
 	store_##NAME(struct device *dev, struct device_attribute *attr, \
@@ -183,7 +184,7 @@ static void add_write_permission_dev_attr(struct device_attribute *attr)
 static ssize_t show_dscr_default(struct device *dev,
 		struct device_attribute *attr, char *buf)
 {
-	return sprintf(buf, "%lx\n", dscr_default);
+	return sysfs_emit(buf, "%lx\n", dscr_default);
 }
 
 /**
@@ -272,7 +273,7 @@ static ssize_t show_pw20_state(struct device *dev,
 
 	value &= PWRMGTCR0_PW20_WAIT;
 
-	return sprintf(buf, "%u\n", value ? 1 : 0);
+	return sysfs_emit(buf, "%u\n", value ? 1 : 0);
 }
 
 static void do_store_pw20_state(void *val)
@@ -337,7 +338,7 @@ static ssize_t show_pw20_wait_time(struct device *dev,
 		time = pw20_wt;
 	}
 
-	return sprintf(buf, "%llu\n", time > 0 ? time : 0);
+	return sysfs_emit(buf, "%llu\n", time > 0 ? time : 0);
 }
 
 static void set_pw20_wait_entry_bit(void *val)
@@ -394,7 +395,7 @@ static ssize_t show_altivec_idle(struct device *dev,
 
 	value &= PWRMGTCR0_AV_IDLE_PD_EN;
 
-	return sprintf(buf, "%u\n", value ? 1 : 0);
+	return sysfs_emit(buf, "%u\n", value ? 1 : 0);
 }
 
 static void do_store_altivec_idle(void *val)
@@ -459,7 +460,7 @@ static ssize_t show_altivec_idle_wait_time(struct device *dev,
 		time = altivec_idle_wt;
 	}
 
-	return sprintf(buf, "%llu\n", time > 0 ? time : 0);
+	return sysfs_emit(buf, "%llu\n", time > 0 ? time : 0);
 }
 
 static void set_altivec_idle_wait_entry_bit(void *val)
@@ -746,7 +747,7 @@ static struct device_attribute pa6t_attrs[] = {
 #ifdef CONFIG_PPC_SVM
 static ssize_t show_svm(struct device *dev, struct device_attribute *attr, char *buf)
 {
-	return sprintf(buf, "%u\n", is_secure_guest());
+	return sysfs_emit(buf, "%u\n", is_secure_guest());
 }
 static DEVICE_ATTR(svm, 0444, show_svm, NULL);
 
@@ -780,7 +781,7 @@ static ssize_t idle_purr_show(struct device *dev,
 	u64 val;
 
 	smp_call_function_single(cpu->dev.id, read_idle_purr, &val, 1);
-	return sprintf(buf, "%llx\n", val);
+	return sysfs_emit(buf, "%llx\n", val);
 }
 static DEVICE_ATTR(idle_purr, 0400, idle_purr_show, NULL);
 
@@ -810,7 +811,7 @@ static ssize_t idle_spurr_show(struct device *dev,
 	u64 val;
 
 	smp_call_function_single(cpu->dev.id, read_idle_spurr, &val, 1);
-	return sprintf(buf, "%llx\n", val);
+	return sysfs_emit(buf, "%llx\n", val);
 }
 static DEVICE_ATTR(idle_spurr, 0400, idle_spurr_show, NULL);
 
@@ -1143,7 +1144,7 @@ static ssize_t show_physical_id(struct device *dev,
 {
 	struct cpu *cpu = container_of(dev, struct cpu, dev);
 
-	return sprintf(buf, "%d\n", get_hard_smp_processor_id(cpu->dev.id));
+	return sysfs_emit(buf, "%d\n", get_hard_smp_processor_id(cpu->dev.id));
 }
 static DEVICE_ATTR(physical_id, 0444, show_physical_id, NULL);
 

arch/powerpc/perf/core-book3s.c

@@ -10,6 +10,7 @@
 #include <linux/perf_event.h>
 #include <linux/percpu.h>
 #include <linux/hardirq.h>
+#include <linux/sysfs.h>
 #include <linux/uaccess.h>
 #include <asm/reg.h>
 #include <asm/pmc.h>
@@ -2204,7 +2205,7 @@ ssize_t power_events_sysfs_show(struct device *dev,
 
 	pmu_attr = container_of(attr, struct perf_pmu_events_attr, attr);
 
-	return sprintf(page, "event=0x%02llx\n", pmu_attr->id);
+	return sysfs_emit(page, "event=0x%02llx\n", pmu_attr->id);
 }
 
 static struct pmu power_pmu = {

arch/powerpc/perf/hv-24x7.c

@@ -12,6 +12,7 @@
 #include <linux/rbtree.h>
 #include <linux/module.h>
 #include <linux/slab.h>
+#include <linux/sysfs.h>
 #include <linux/vmalloc.h>
 
 #include <asm/cputhreads.h>
@@ -434,19 +435,19 @@ static ssize_t cpumask_show(struct device *dev,
 static ssize_t sockets_show(struct device *dev,
 			    struct device_attribute *attr, char *buf)
 {
-	return sprintf(buf, "%d\n", phys_sockets);
+	return sysfs_emit(buf, "%d\n", phys_sockets);
 }
 
 static ssize_t chipspersocket_show(struct device *dev,
 				   struct device_attribute *attr, char *buf)
 {
-	return sprintf(buf, "%d\n", phys_chipspersocket);
+	return sysfs_emit(buf, "%d\n", phys_chipspersocket);
 }
 
 static ssize_t coresperchip_show(struct device *dev,
 				 struct device_attribute *attr, char *buf)
 {
-	return sprintf(buf, "%d\n", phys_coresperchip);
+	return sysfs_emit(buf, "%d\n", phys_coresperchip);
 }
 
 static struct attribute *device_str_attr_create_(char *name, char *str)
@@ -1061,7 +1062,7 @@ static ssize_t catalog_read(struct file *filp, struct kobject *kobj,
 static ssize_t domains_show(struct device *dev, struct device_attribute *attr,
 			    char *page)
 {
-	int d, n, count = 0;
+	int d, count = 0;
 	const char *str;
 
 	for (d = 0; d < HV_PERF_DOMAIN_MAX; d++) {
@@ -1069,12 +1070,7 @@ static ssize_t domains_show(struct device *dev, struct device_attribute *attr,
 		if (!str)
 			continue;
 
-		n = sprintf(page, "%d: %s\n", d, str);
-		if (n < 0)
-			break;
-
-		count += n;
-		page += n;
+		count += sysfs_emit_at(page, count, "%d: %s\n", d, str);
 	}
 	return count;
 }
@@ -1095,7 +1091,7 @@ static ssize_t _name##_show(struct device *dev,			\
 		ret = -EIO;					\
 		goto e_free;					\
 	}							\
-	ret = sprintf(buf, _fmt, _expr);			\
+	ret = sysfs_emit(buf, _fmt, _expr);			\
 e_free:								\
 	kmem_cache_free(hv_page_cache, page);			\
 	return ret;						\

arch/powerpc/perf/hv-gpci.c

@@ -11,6 +11,7 @@
 
 #include <linux/init.h>
 #include <linux/perf_event.h>
+#include <linux/sysfs.h>
 #include <asm/firmware.h>
 #include <asm/hvcall.h>
 #include <asm/io.h>
@@ -85,7 +86,7 @@ static ssize_t _name##_show(struct device *dev,			\
 	if (hret)						\
 		return -EIO;					\
 								\
-	return sprintf(page, _format, caps._name);		\
+	return sysfs_emit(page, _format, caps._name);		\
 }								\
 static struct device_attribute hv_caps_attr_##_name = __ATTR_RO(_name)
 
@@ -93,7 +94,7 @@ static ssize_t kernel_version_show(struct device *dev,
 				   struct device_attribute *attr,
 				   char *page)
 {
-	return sprintf(page, "0x%x\n", COUNTER_INFO_VERSION_CURRENT);
+	return sysfs_emit(page, "0x%x\n", COUNTER_INFO_VERSION_CURRENT);
 }
 
 static ssize_t cpumask_show(struct device *dev,

arch/powerpc/perf/kvm-hv-pmu.c

@@ -16,6 +16,7 @@
 #include <linux/perf_event.h>
 #include <linux/spinlock_types.h>
 #include <linux/spinlock.h>
+#include <linux/sysfs.h>
 
 #include <asm/types.h>
 #include <asm/kvm_ppc.h>
@@ -48,7 +49,7 @@ static ssize_t kvmppc_events_sysfs_show(struct device *dev,
 	struct perf_pmu_events_attr *pmu_attr;
 
 	pmu_attr = container_of(attr, struct perf_pmu_events_attr, attr);
-	return sprintf(page, "event=0x%02llx\n", pmu_attr->id);
+	return sysfs_emit(page, "event=0x%02llx\n", pmu_attr->id);
 }
 
 /* Holds the hostwide stats */

arch/powerpc/perf/vpa-pmu.c

@@ -8,6 +8,7 @@
 
 #include <linux/module.h>
 #include <linux/perf_event.h>
+#include <linux/sysfs.h>
 #include <asm/kvm_ppc.h>
 #include <asm/kvm_book3s_64.h>
 
@@ -26,7 +27,7 @@ static ssize_t vpa_pmu_events_sysfs_show(struct device *dev,
 
 	pmu_attr = container_of(attr, struct perf_pmu_events_attr, attr);
 
-	return sprintf(page, "event=0x%02llx\n", pmu_attr->id);
+	return sysfs_emit(page, "event=0x%02llx\n", pmu_attr->id);
 }
 
 #define VPA_PMU_EVENT_ATTR(_name, _id)				\

arch/powerpc/platforms/83xx/mcu_mpc8349emitx.c

@@ -15,6 +15,7 @@
 #include <linux/i2c.h>
 #include <linux/gpio/driver.h>
 #include <linux/slab.h>
+#include <linux/sysfs.h>
 #include <linux/kthread.h>
 #include <linux/property.h>
 #include <linux/reboot.h>
@@ -77,7 +78,7 @@ static ssize_t show_status(struct device *d,
 		return -ENODEV;
 	mcu->reg_ctrl = ret;
 
-	return sprintf(buf, "%02x\n", ret);
+	return sysfs_emit(buf, "%02x\n", ret);
 }
 static DEVICE_ATTR(status, 0444, show_status, NULL);
 

arch/powerpc/platforms/cell/spu_base.c

@@ -20,6 +20,7 @@
 #include <linux/mutex.h>
 #include <linux/linux_logo.h>
 #include <linux/syscore_ops.h>
+#include <linux/sysfs.h>
 #include <asm/spu.h>
 #include <asm/spu_priv1.h>
 #include <asm/spu_csa.h>
@@ -638,8 +639,8 @@ static ssize_t spu_stat_show(struct device *dev,
 {
 	struct spu *spu = container_of(dev, struct spu, dev);
 
-	return sprintf(buf, "%s %llu %llu %llu %llu "
-		      "%llu %llu %llu %llu %llu %llu %llu %llu\n",
+	return sysfs_emit(buf,
+		"%s %llu %llu %llu %llu %llu %llu %llu %llu %llu %llu %llu %llu\n",
 		spu_state_names[spu->stats.util_state],
 		spu_acct_time(spu, SPU_UTIL_USER),
 		spu_acct_time(spu, SPU_UTIL_SYSTEM),

arch/powerpc/platforms/powernv/idle.c

@@ -8,6 +8,7 @@
 #include <linux/types.h>
 #include <linux/mm.h>
 #include <linux/slab.h>
+#include <linux/sysfs.h>
 #include <linux/of.h>
 #include <linux/device.h>
 #include <linux/cpu.h>
@@ -171,7 +172,7 @@ static u8 fastsleep_workaround_applyonce;
 static ssize_t show_fastsleep_workaround_applyonce(struct device *dev,
 		struct device_attribute *attr, char *buf)
 {
-	return sprintf(buf, "%u\n", fastsleep_workaround_applyonce);
+	return sysfs_emit(buf, "%u\n", fastsleep_workaround_applyonce);
 }
 
 static ssize_t store_fastsleep_workaround_applyonce(struct device *dev,

arch/powerpc/platforms/powernv/opal-dump.c

@@ -8,6 +8,7 @@
 #include <linux/kobject.h>
 #include <linux/mm.h>
 #include <linux/slab.h>
+#include <linux/sysfs.h>
 #include <linux/vmalloc.h>
 #include <linux/pagemap.h>
 #include <linux/delay.h>
@@ -40,7 +41,7 @@ static ssize_t dump_id_show(struct dump_obj *dump_obj,
 			    struct dump_attribute *attr,
 			    char *buf)
 {
-	return sprintf(buf, "0x%x\n", dump_obj->id);
+	return sysfs_emit(buf, "0x%x\n", dump_obj->id);
 }
 
 static const char* dump_type_to_string(uint32_t type)
@@ -58,15 +59,15 @@ static ssize_t dump_type_show(struct dump_obj *dump_obj,
 			      char *buf)
 {
 
-	return sprintf(buf, "0x%x %s\n", dump_obj->type,
-		       dump_type_to_string(dump_obj->type));
+	return sysfs_emit(buf, "0x%x %s\n", dump_obj->type,
+			  dump_type_to_string(dump_obj->type));
 }
 
 static ssize_t dump_ack_show(struct dump_obj *dump_obj,
 			     struct dump_attribute *attr,
 			     char *buf)
 {
-	return sprintf(buf, "ack - acknowledge dump\n");
+	return sysfs_emit(buf, "ack - acknowledge dump\n");
 }
 
 /*
@@ -114,7 +115,7 @@ static ssize_t init_dump_show(struct dump_obj *dump_obj,
 			      struct dump_attribute *attr,
 			      char *buf)
 {
-	return sprintf(buf, "1 - initiate Service Processor(FSP) dump\n");
+	return sysfs_emit(buf, "1 - initiate Service Processor(FSP) dump\n");
 }
 
 static int64_t dump_fips_init(uint8_t type)

arch/powerpc/platforms/powernv/opal-elog.c

@@ -40,7 +40,7 @@ static ssize_t elog_id_show(struct elog_obj *elog_obj,
 			    struct elog_attribute *attr,
 			    char *buf)
 {
-	return sprintf(buf, "0x%llx\n", elog_obj->id);
+	return sysfs_emit(buf, "0x%llx\n", elog_obj->id);
 }
 
 static const char *elog_type_to_string(uint64_t type)
@@ -55,16 +55,15 @@ static ssize_t elog_type_show(struct elog_obj *elog_obj,
 			      struct elog_attribute *attr,
 			      char *buf)
 {
-	return sprintf(buf, "0x%llx %s\n",
-		       elog_obj->type,
-		       elog_type_to_string(elog_obj->type));
+	return sysfs_emit(buf, "0x%llx %s\n", elog_obj->type,
+			  elog_type_to_string(elog_obj->type));
 }
 
 static ssize_t elog_ack_show(struct elog_obj *elog_obj,
 			     struct elog_attribute *attr,
 			     char *buf)
 {
-	return sprintf(buf, "ack - acknowledge log message\n");
+	return sysfs_emit(buf, "ack - acknowledge log message\n");
 }
 
 static ssize_t elog_ack_store(struct elog_obj *elog_obj,

arch/powerpc/platforms/powernv/opal-flash.c

@@ -238,7 +238,7 @@ static ssize_t manage_show(struct kobject *kobj,
 	struct manage_flash_t *const args_buf = &manage_flash_data;
 	int rc;
 
-	rc = sprintf(buf, "%d\n", args_buf->status);
+	rc = sysfs_emit(buf, "%d\n", args_buf->status);
 	/* Set status to default*/
 	args_buf->status = FLASH_NO_OP;
 	return rc;
@@ -321,7 +321,7 @@ static ssize_t update_show(struct kobject *kobj,
 			   struct kobj_attribute *attr, char *buf)
 {
 	struct update_flash_t *const args_buf = &update_flash_data;
-	return sprintf(buf, "%d\n", args_buf->status);
+	return sysfs_emit(buf, "%d\n", args_buf->status);
 }
 
 /*

arch/powerpc/platforms/powernv/opal-powercap.c

@@ -10,6 +10,7 @@
 #include <linux/of.h>
 #include <linux/kobject.h>
 #include <linux/slab.h>
+#include <linux/sysfs.h>
 
 #include <asm/opal.h>
 
@@ -56,16 +57,11 @@ static ssize_t powercap_show(struct kobject *kobj, struct kobj_attribute *attr,
 			goto out;
 		}
 		ret = opal_error_code(opal_get_async_rc(msg));
-		if (!ret) {
-			ret = sprintf(buf, "%u\n", be32_to_cpu(pcap));
-			if (ret < 0)
-				ret = -EIO;
-		}
+		if (!ret)
+			ret = sysfs_emit(buf, "%u\n", be32_to_cpu(pcap));
 		break;
 	case OPAL_SUCCESS:
-		ret = sprintf(buf, "%u\n", be32_to_cpu(pcap));
-		if (ret < 0)
-			ret = -EIO;
+		ret = sysfs_emit(buf, "%u\n", be32_to_cpu(pcap));
 		break;
 	default:
 		ret = opal_error_code(ret);

arch/powerpc/platforms/powernv/opal-psr.c

@@ -10,6 +10,7 @@
 #include <linux/of.h>
 #include <linux/kobject.h>
 #include <linux/slab.h>
+#include <linux/sysfs.h>
 
 #include <asm/opal.h>
 
@@ -50,16 +51,11 @@ static ssize_t psr_show(struct kobject *kobj, struct kobj_attribute *attr,
 			goto out;
 		}
 		ret = opal_error_code(opal_get_async_rc(msg));
-		if (!ret) {
-			ret = sprintf(buf, "%u\n", be32_to_cpu(psr));
-			if (ret < 0)
-				ret = -EIO;
-		}
+		if (!ret)
+			ret = sysfs_emit(buf, "%u\n", be32_to_cpu(psr));
 		break;
 	case OPAL_SUCCESS:
-		ret = sprintf(buf, "%u\n", be32_to_cpu(psr));
-		if (ret < 0)
-			ret = -EIO;
+		ret = sysfs_emit(buf, "%u\n", be32_to_cpu(psr));
 		break;
 	default:
 		ret = opal_error_code(ret);

arch/powerpc/platforms/powernv/subcore.c

@@ -12,6 +12,7 @@
 #include <linux/gfp.h>
 #include <linux/smp.h>
 #include <linux/stop_machine.h>
+#include <linux/sysfs.h>
 
 #include <asm/cputhreads.h>
 #include <asm/cpuidle.h>
@@ -409,7 +410,7 @@ static ssize_t __used store_subcores_per_core(struct device *dev,
 static ssize_t show_subcores_per_core(struct device *dev,
 		struct device_attribute *attr, char *buf)
 {
-	return sprintf(buf, "%x\n", subcores_per_core);
+	return sysfs_emit(buf, "%x\n", subcores_per_core);
 }
 
 static DEVICE_ATTR(subcores_per_core, 0644,

arch/powerpc/platforms/ps3/setup.c

@@ -10,6 +10,7 @@
 #include <linux/delay.h>
 #include <linux/fs.h>
 #include <linux/root_dev.h>
+#include <linux/sysfs.h>
 #include <linux/console.h>
 #include <linux/export.h>
 #include <linux/memblock.h>
@@ -183,7 +184,7 @@ static int ps3_set_dabr(unsigned long dabr, unsigned long dabrx)
 static ssize_t ps3_fw_version_show(struct kobject *kobj,
 	struct kobj_attribute *attr, char *buf)
 {
-	return sprintf(buf, "%s", ps3_firmware_version_str);
+	return sysfs_emit(buf, "%s\n", ps3_firmware_version_str);
 }
 
 static int __init ps3_setup_sysfs(void)

arch/powerpc/platforms/pseries/cmm.c

@@ -18,6 +18,7 @@
 #include <linux/sched.h>
 #include <linux/stringify.h>
 #include <linux/swap.h>
+#include <linux/sysfs.h>
 #include <linux/device.h>
 #include <linux/balloon.h>
 #include <asm/firmware.h>
@@ -333,7 +334,7 @@ static int cmm_thread(void *dummy)
 				   struct device_attribute *attr,	\
 				   char *buf)			\
 	{							\
-		return sprintf(buf, format, ##args);		\
+		return sysfs_emit(buf, format, ##args);		\
 	}							\
 	static DEVICE_ATTR(name, 0444, show_##name, NULL)
 
@@ -343,7 +344,7 @@ CMM_SHOW(loaned_target_kb, "%lu\n", PAGES2KB(loaned_pages_target));
 static ssize_t show_oom_pages(struct device *dev,
 			      struct device_attribute *attr, char *buf)
 {
-	return sprintf(buf, "%lu\n", PAGES2KB(oom_freed_pages));
+	return sysfs_emit(buf, "%lu\n", PAGES2KB(oom_freed_pages));
 }
 
 static ssize_t store_oom_pages(struct device *dev,

arch/powerpc/platforms/pseries/dlpar.c

@@ -14,6 +14,7 @@
 #include <linux/spinlock.h>
 #include <linux/cpu.h>
 #include <linux/slab.h>
+#include <linux/sysfs.h>
 #include <linux/of.h>
 
 #include "of_helpers.h"
@@ -798,7 +799,7 @@ static ssize_t dlpar_store(const struct class *class, const struct class_attribu
 static ssize_t dlpar_show(const struct class *class, const struct class_attribute *attr,
 			  char *buf)
 {
-	return sprintf(buf, "%s\n", "memory,cpu,dt");
+	return sysfs_emit(buf, "%s\n", "memory,cpu,dt");
 }
 
 static CLASS_ATTR_RW(dlpar);

arch/powerpc/platforms/pseries/ibmebus.c

@@ -46,6 +46,7 @@
 #include <linux/of.h>
 #include <linux/slab.h>
 #include <linux/stat.h>
+#include <linux/sysfs.h>
 #include <linux/of_platform.h>
 #include <linux/platform_device.h>
 #include <asm/ibmebus.h>
@@ -399,7 +400,7 @@ static ssize_t devspec_show(struct device *dev,
 	struct platform_device *ofdev;
 
 	ofdev = to_platform_device(dev);
-	return sprintf(buf, "%pOF\n", ofdev->dev.of_node);
+	return sysfs_emit(buf, "%pOF\n", ofdev->dev.of_node);
 }
 static DEVICE_ATTR_RO(devspec);
 
@@ -409,7 +410,7 @@ static ssize_t name_show(struct device *dev,
 	struct platform_device *ofdev;
 
 	ofdev = to_platform_device(dev);
-	return sprintf(buf, "%pOFn\n", ofdev->dev.of_node);
+	return sysfs_emit(buf, "%pOFn\n", ofdev->dev.of_node);
 }
 static DEVICE_ATTR_RO(name);
 

arch/powerpc/platforms/pseries/papr_scm.c

@@ -8,6 +8,7 @@
 #include <linux/ioport.h>
 #include <linux/seq_file.h>
 #include <linux/slab.h>
+#include <linux/sysfs.h>
 #include <linux/ndctl.h>
 #include <linux/sched.h>
 #include <linux/libnvdimm.h>
@@ -1062,8 +1063,8 @@ static ssize_t health_bitmap_inject_show(struct device *dev,
 	struct nvdimm *dimm = to_nvdimm(dev);
 	struct papr_scm_priv *p = nvdimm_provider_data(dimm);
 
-	return sprintf(buf, "%#llx\n",
-		       READ_ONCE(p->health_bitmap_inject_mask));
+	return sysfs_emit(buf, "%#llx\n",
+			  READ_ONCE(p->health_bitmap_inject_mask));
 }
 
 static DEVICE_ATTR_ADMIN_RO(health_bitmap_inject);

arch/powerpc/platforms/pseries/power.c

@@ -11,6 +11,7 @@
 
 #include <linux/kobject.h>
 #include <linux/string.h>
+#include <linux/sysfs.h>
 #include <linux/errno.h>
 #include <linux/init.h>
 #include <asm/machdep.h>
@@ -22,7 +23,7 @@ unsigned long rtas_poweron_auto; /* default and normal state is 0 */
 static ssize_t auto_poweron_show(struct kobject *kobj,
 				 struct kobj_attribute *attr, char *buf)
 {
-        return sprintf(buf, "%lu\n", rtas_poweron_auto);
+	return sysfs_emit(buf, "%lu\n", rtas_poweron_auto);
 }
 
 static ssize_t auto_poweron_store(struct kobject *kobj,

arch/powerpc/platforms/pseries/pseries_energy.c

@@ -12,6 +12,7 @@
 #include <linux/errno.h>
 #include <linux/init.h>
 #include <linux/seq_file.h>
+#include <linux/sysfs.h>
 #include <linux/device.h>
 #include <linux/cpu.h>
 #include <linux/of.h>
@@ -242,7 +243,7 @@ static ssize_t get_best_energy_data(struct device *dev,
 	if (rc != H_SUCCESS)
 		return -EINVAL;
 
-	return sprintf(page, "%lu\n", retbuf[1] >> 32);
+	return sysfs_emit(page, "%lu\n", retbuf[1] >> 32);
 }
 
 /* Wrapper functions */

arch/powerpc/platforms/pseries/suspend.c

@@ -7,6 +7,7 @@
 #include <linux/delay.h>
 #include <linux/suspend.h>
 #include <linux/stat.h>
+#include <linux/sysfs.h>
 #include <asm/firmware.h>
 #include <asm/hvcall.h>
 #include <asm/machdep.h>
@@ -121,7 +122,7 @@ static ssize_t show_hibernate(struct device *dev,
 			      struct device_attribute *attr,
 			      char *buf)
 {
-	return sprintf(buf, "%d\n", KERN_DT_UPDATE);
+	return sysfs_emit(buf, "%d\n", KERN_DT_UPDATE);
 }
 
 static DEVICE_ATTR(hibernate, 0644, show_hibernate, store_hibernate);

arch/powerpc/platforms/pseries/vas-sysfs.c

@@ -10,6 +10,7 @@
 #include <linux/miscdevice.h>
 #include <linux/kobject.h>
 #include <linux/slab.h>
+#include <linux/sysfs.h>
 #include <linux/mm.h>
 
 #include "vas.h"
@@ -58,7 +59,7 @@ static ssize_t update_total_credits_store(struct vas_cop_feat_caps *caps,
 #define sysfs_caps_entry_read(_name)					\
 static ssize_t _name##_show(struct vas_cop_feat_caps *caps, char *buf) 	\
 {									\
-	return sprintf(buf, "%d\n", atomic_read(&caps->_name));	\
+	return sysfs_emit(buf, "%d\n", atomic_read(&caps->_name));	\
 }
 
 struct vas_sysfs_entry {

arch/powerpc/platforms/pseries/vio.c

@@ -14,6 +14,7 @@
 #include <linux/types.h>
 #include <linux/delay.h>
 #include <linux/stat.h>
+#include <linux/sysfs.h>
 #include <linux/device.h>
 #include <linux/init.h>
 #include <linux/slab.h>
@@ -942,14 +943,14 @@ static ssize_t cmo_##name##_show(struct device *dev,                    \
                                         struct device_attribute *attr,  \
                                          char *buf)                     \
 {                                                                       \
-	return sprintf(buf, "%lu\n", to_vio_dev(dev)->cmo.name);        \
+	return sysfs_emit(buf, "%lu\n", to_vio_dev(dev)->cmo.name);     \
 }
 
 static ssize_t cmo_allocs_failed_show(struct device *dev,
 		struct device_attribute *attr, char *buf)
 {
 	struct vio_dev *viodev = to_vio_dev(dev);
-	return sprintf(buf, "%d\n", atomic_read(&viodev->cmo.allocs_failed));
+	return sysfs_emit(buf, "%d\n", atomic_read(&viodev->cmo.allocs_failed));
 }
 
 static ssize_t cmo_allocs_failed_store(struct device *dev,
@@ -998,7 +999,7 @@ static DEVICE_ATTR_RW(cmo_allocs_failed);
 #define viobus_cmo_rd_attr(name)                                        \
 static ssize_t cmo_bus_##name##_show(const struct bus_type *bt, char *buf)    \
 {                                                                       \
-	return sprintf(buf, "%lu\n", vio_cmo.name);                     \
+	return sysfs_emit(buf, "%lu\n", vio_cmo.name);                  \
 }                                                                       \
 static struct bus_attribute bus_attr_cmo_bus_##name =			\
 	__ATTR(cmo_##name, S_IRUGO, cmo_bus_##name##_show, NULL)
@@ -1007,7 +1008,7 @@ static struct bus_attribute bus_attr_cmo_bus_##name =			\
 static ssize_t                                                          \
 cmo_##name##_##var##_show(const struct bus_type *bt, char *buf)         \
 {                                                                       \
-	return sprintf(buf, "%lu\n", vio_cmo.name.var);                 \
+	return sysfs_emit(buf, "%lu\n", vio_cmo.name.var);              \
 }                                                                       \
 static BUS_ATTR_RO(cmo_##name##_##var)
 
@@ -1022,7 +1023,7 @@ viobus_cmo_pool_rd_attr(excess, free);
 
 static ssize_t cmo_high_show(const struct bus_type *bt, char *buf)
 {
-	return sprintf(buf, "%lu\n", vio_cmo.high);
+	return sysfs_emit(buf, "%lu\n", vio_cmo.high);
 }
 
 static ssize_t cmo_high_store(const struct bus_type *bt, const char *buf,
@@ -1535,7 +1536,7 @@ machine_device_initcall(pseries, vio_device_init);
 static ssize_t name_show(struct device *dev,
 		struct device_attribute *attr, char *buf)
 {
-	return sprintf(buf, "%s\n", to_vio_dev(dev)->name);
+	return sysfs_emit(buf, "%s\n", to_vio_dev(dev)->name);
 }
 static DEVICE_ATTR_RO(name);
 
@@ -1544,7 +1545,7 @@ static ssize_t devspec_show(struct device *dev,
 {
 	struct device_node *of_node = dev->of_node;
 
-	return sprintf(buf, "%pOF\n", of_node);
+	return sysfs_emit(buf, "%pOF\n", of_node);
 }
 static DEVICE_ATTR_RO(devspec);
 
@@ -1556,17 +1557,13 @@ static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
 	const char *cp;
 
 	dn = dev->of_node;
-	if (!dn) {
-		strcpy(buf, "\n");
-		return strlen(buf);
-	}
+	if (!dn)
+		return sysfs_emit(buf, "\n");
 	cp = of_get_property(dn, "compatible", NULL);
-	if (!cp) {
-		strcpy(buf, "\n");
-		return strlen(buf);
-	}
+	if (!cp)
+		return sysfs_emit(buf, "\n");
 
-	return sprintf(buf, "vio:T%sS%s\n", vio_dev->type, cp);
+	return sysfs_emit(buf, "vio:T%sS%s\n", vio_dev->type, cp);
 }
 static DEVICE_ATTR_RO(modalias);
 

arch/powerpc/sysdev/fsl_mpic_timer_wakeup.c

@@ -7,6 +7,7 @@
 
 #include <linux/kernel.h>
 #include <linux/slab.h>
+#include <linux/sysfs.h>
 #include <linux/errno.h>
 #include <linux/module.h>
 #include <linux/interrupt.h>
@@ -61,7 +62,7 @@ static ssize_t fsl_timer_wakeup_show(struct device *dev,
 	}
 	mutex_unlock(&sysfs_lock);
 
-	return sprintf(buf, "%lld\n", interval);
+	return sysfs_emit(buf, "%lld\n", interval);
 }
 
 static ssize_t fsl_timer_wakeup_store(struct device *dev,