smp: Remove smp_call_function() and on_each_cpu() return values

The return value is fixed. Remove it and amend the callers.

[ tglx: Fixup arm/bL_switcher and powerpc/rtas ]

Signed-off-by: Nadav Amit <namit@vmware.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Richard Henderson <rth@twiddle.net>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Cc: Matt Turner <mattst88@gmail.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Link: https://lkml.kernel.org/r/20190613064813.8102-2-namit@vmware.com

11 files changed, 27 insertions, 53 deletions

diff --git a/arch/alpha/kernel/smp.c b/arch/alpha/kernel/smp.c
index d0dccae53ba9..5f90df30be20 100644
--- a/arch/alpha/kernel/smp.c
+++ b/arch/alpha/kernel/smp.c
@@ -614,8 +614,7 @@ void
 smp_imb(void)
 {
         /* Must wait other processors to flush their icache before continue. */
-        if (on_each_cpu(ipi_imb, NULL, 1))
-                printk(KERN_CRIT "smp_imb: timed out\n");
+        on_each_cpu(ipi_imb, NULL, 1);
 }
 EXPORT_SYMBOL(smp_imb);
 
@@ -630,9 +629,7 @@ flush_tlb_all(void)
 {
         /* Although we don't have any data to pass, we do want to
            synchronize with the other processors.  */
-        if (on_each_cpu(ipi_flush_tlb_all, NULL, 1)) {
-                printk(KERN_CRIT "flush_tlb_all: timed out\n");
-        }
+        on_each_cpu(ipi_flush_tlb_all, NULL, 1);
 }
 
 #define asn_locked() (cpu_data[smp_processor_id()].asn_lock)
@@ -667,9 +664,7 @@ flush_tlb_mm(struct mm_struct *mm)
                 }
         }
 
-        if (smp_call_function(ipi_flush_tlb_mm, mm, 1)) {
-                printk(KERN_CRIT "flush_tlb_mm: timed out\n");
-        }
+        smp_call_function(ipi_flush_tlb_mm, mm, 1);
 
         preempt_enable();
 }
@@ -720,9 +715,7 @@ flush_tlb_page(struct vm_area_struct *vma, unsigned long addr)
         data.mm = mm;
         data.addr = addr;
 
-        if (smp_call_function(ipi_flush_tlb_page, &data, 1)) {
-                printk(KERN_CRIT "flush_tlb_page: timed out\n");
-        }
+        smp_call_function(ipi_flush_tlb_page, &data, 1);
 
         preempt_enable();
 }
@@ -772,9 +765,7 @@ flush_icache_user_range(struct vm_area_struct *vma, struct page *page,
                 }
         }
 
-        if (smp_call_function(ipi_flush_icache_page, mm, 1)) {
-                printk(KERN_CRIT "flush_icache_page: timed out\n");
-        }
+        smp_call_function(ipi_flush_icache_page, mm, 1);
 
         preempt_enable();
 }
diff --git a/arch/alpha/oprofile/common.c b/arch/alpha/oprofile/common.c
index 310a4ce1dccc..1b1259c7d7d1 100644
--- a/arch/alpha/oprofile/common.c
+++ b/arch/alpha/oprofile/common.c
@@ -65,7 +65,7 @@ op_axp_setup(void)
         model->reg_setup(&reg, ctr, &sys);
 
         /* Configure the registers on all cpus.  */
-        (void)smp_call_function(model->cpu_setup, &reg, 1);
+        smp_call_function(model->cpu_setup, &reg, 1);
         model->cpu_setup(&reg);
         return 0;
 }
@@ -86,7 +86,7 @@ op_axp_cpu_start(void *dummy)
 static int
 op_axp_start(void)
 {
-        (void)smp_call_function(op_axp_cpu_start, NULL, 1);
+        smp_call_function(op_axp_cpu_start, NULL, 1);
         op_axp_cpu_start(NULL);
         return 0;
 }
@@ -101,7 +101,7 @@ op_axp_cpu_stop(void *dummy)
 static void
 op_axp_stop(void)
 {
-        (void)smp_call_function(op_axp_cpu_stop, NULL, 1);
+        smp_call_function(op_axp_cpu_stop, NULL, 1);
         op_axp_cpu_stop(NULL);
 }
 
diff --git a/arch/arm/common/bL_switcher.c b/arch/arm/common/bL_switcher.c
index 57f3b7512636..17bc259729e2 100644
--- a/arch/arm/common/bL_switcher.c
+++ b/arch/arm/common/bL_switcher.c
@@ -542,16 +542,14 @@ static void bL_switcher_trace_trigger_cpu(void *__always_unused info)
 
 int bL_switcher_trace_trigger(void)
 {
-        int ret;
-
         preempt_disable();
 
         bL_switcher_trace_trigger_cpu(NULL);
-        ret = smp_call_function(bL_switcher_trace_trigger_cpu, NULL, true);
+        smp_call_function(bL_switcher_trace_trigger_cpu, NULL, true);
 
         preempt_enable();
 
-        return ret;
+        return 0;
 }
 EXPORT_SYMBOL_GPL(bL_switcher_trace_trigger);
 
diff --git a/arch/ia64/kernel/perfmon.c b/arch/ia64/kernel/perfmon.c
index 58a6337c0690..7c52bd2695a2 100644
--- a/arch/ia64/kernel/perfmon.c
+++ b/arch/ia64/kernel/perfmon.c
@@ -6390,11 +6390,7 @@ pfm_install_alt_pmu_interrupt(pfm_intr_handler_desc_t *hdl)
         }
 
         /* save the current system wide pmu states */
-        ret = on_each_cpu(pfm_alt_save_pmu_state, NULL, 1);
-        if (ret) {
-                DPRINT(("on_each_cpu() failed: %d\n", ret));
-                goto cleanup_reserve;
-        }
+        on_each_cpu(pfm_alt_save_pmu_state, NULL, 1);
 
         /* officially change to the alternate interrupt handler */
         pfm_alt_intr_handler = hdl;
@@ -6421,7 +6417,6 @@ int
 pfm_remove_alt_pmu_interrupt(pfm_intr_handler_desc_t *hdl)
 {
         int i;
-        int ret;
 
         if (hdl == NULL) return -EINVAL;
 
@@ -6435,10 +6430,7 @@ pfm_remove_alt_pmu_interrupt(pfm_intr_handler_desc_t *hdl)
 
         pfm_alt_intr_handler = NULL;
 
-        ret = on_each_cpu(pfm_alt_restore_pmu_state, NULL, 1);
-        if (ret) {
-                DPRINT(("on_each_cpu() failed: %d\n", ret));
-        }
+        on_each_cpu(pfm_alt_restore_pmu_state, NULL, 1);
 
         for_each_online_cpu(i) {
                 pfm_unreserve_session(NULL, 1, i);
diff --git a/arch/ia64/kernel/uncached.c b/arch/ia64/kernel/uncached.c
index 583f7ff6b589..c618d0745e22 100644
--- a/arch/ia64/kernel/uncached.c
+++ b/arch/ia64/kernel/uncached.c
@@ -124,8 +124,8 @@ static int uncached_add_chunk(struct uncached_pool *uc_pool, int nid)
         status = ia64_pal_prefetch_visibility(PAL_VISIBILITY_PHYSICAL);
         if (status == PAL_VISIBILITY_OK_REMOTE_NEEDED) {
                 atomic_set(&uc_pool->status, 0);
-                status = smp_call_function(uncached_ipi_visibility, uc_pool, 1);
-                if (status || atomic_read(&uc_pool->status))
+                smp_call_function(uncached_ipi_visibility, uc_pool, 1);
+                if (atomic_read(&uc_pool->status))
                         goto failed;
         } else if (status != PAL_VISIBILITY_OK)
                 goto failed;
@@ -146,8 +146,8 @@ static int uncached_add_chunk(struct uncached_pool *uc_pool, int nid)
         if (status != PAL_STATUS_SUCCESS)
                 goto failed;
         atomic_set(&uc_pool->status, 0);
-        status = smp_call_function(uncached_ipi_mc_drain, uc_pool, 1);
-        if (status || atomic_read(&uc_pool->status))
+        smp_call_function(uncached_ipi_mc_drain, uc_pool, 1);
+        if (atomic_read(&uc_pool->status))
                 goto failed;
 
         /*
diff --git a/arch/powerpc/kernel/rtas.c b/arch/powerpc/kernel/rtas.c
index fbc676160adf..64d95eb6ffff 100644
--- a/arch/powerpc/kernel/rtas.c
+++ b/arch/powerpc/kernel/rtas.c
@@ -994,8 +994,7 @@ int rtas_ibm_suspend_me(u64 handle)
         /* Call function on all CPUs.  One of us will make the
          * rtas call
          */
-        if (on_each_cpu(rtas_percpu_suspend_me, &data, 0))
-                atomic_set(&data.error, -EINVAL);
+        on_each_cpu(rtas_percpu_suspend_me, &data, 0);
 
         wait_for_completion(&done);
 
diff --git a/arch/x86/lib/cache-smp.c b/arch/x86/lib/cache-smp.c
index 1811fa4a1b1a..7c48ff4ae8d1 100644
--- a/arch/x86/lib/cache-smp.c
+++ b/arch/x86/lib/cache-smp.c
@@ -15,6 +15,7 @@ EXPORT_SYMBOL(wbinvd_on_cpu);
 
 int wbinvd_on_all_cpus(void)
 {
-        return on_each_cpu(__wbinvd, NULL, 1);
+        on_each_cpu(__wbinvd, NULL, 1);
+        return 0;
 }
 EXPORT_SYMBOL(wbinvd_on_all_cpus);
diff --git a/drivers/char/agp/generic.c b/drivers/char/agp/generic.c
index 658664a5a5aa..df1edb5ec0ad 100644
--- a/drivers/char/agp/generic.c
+++ b/drivers/char/agp/generic.c
@@ -1311,8 +1311,7 @@ static void ipi_handler(void *null)
 
 void global_cache_flush(void)
 {
-        if (on_each_cpu(ipi_handler, NULL, 1) != 0)
-                panic(PFX "timed out waiting for the other CPUs!\n");
+        on_each_cpu(ipi_handler, NULL, 1);
 }
 EXPORT_SYMBOL(global_cache_flush);
 
diff --git a/include/linux/smp.h b/include/linux/smp.h
index a56f08ff3097..bb8b451ab01f 100644
--- a/include/linux/smp.h
+++ b/include/linux/smp.h
@@ -35,7 +35,7 @@ int smp_call_function_single(int cpuid, smp_call_func_t func, void *info,
 /*
  * Call a function on all processors
  */
-int on_each_cpu(smp_call_func_t func, void *info, int wait);
+void on_each_cpu(smp_call_func_t func, void *info, int wait);
 
 /*
  * Call a function on processors specified by mask, which might include
@@ -101,7 +101,7 @@ extern void smp_cpus_done(unsigned int max_cpus);
 /*
  * Call a function on all other processors
  */
-int smp_call_function(smp_call_func_t func, void *info, int wait);
+void smp_call_function(smp_call_func_t func, void *info, int wait);
 void smp_call_function_many(const struct cpumask *mask,
                             smp_call_func_t func, void *info, bool wait);
 
@@ -144,9 +144,8 @@ static inline void smp_send_stop(void) { }
  *      These macros fold the SMP functionality into a single CPU system
  */
 #define raw_smp_processor_id()                  0
-static inline int up_smp_call_function(smp_call_func_t func, void *info)
+static inline void up_smp_call_function(smp_call_func_t func, void *info)
 {
-        return 0;
 }
 #define smp_call_function(func, info, wait) \
                         (up_smp_call_function(func, info))
diff --git a/kernel/smp.c b/kernel/smp.c
index 220ad142f5dd..616d4d114847 100644
--- a/kernel/smp.c
+++ b/kernel/smp.c
@@ -487,13 +487,11 @@ EXPORT_SYMBOL(smp_call_function_many);
  * You must not call this function with disabled interrupts or from a
  * hardware interrupt handler or from a bottom half handler.
  */
-int smp_call_function(smp_call_func_t func, void *info, int wait)
+void smp_call_function(smp_call_func_t func, void *info, int wait)
 {
         preempt_disable();
         smp_call_function_many(cpu_online_mask, func, info, wait);
         preempt_enable();
-
-        return 0;
 }
 EXPORT_SYMBOL(smp_call_function);
 
@@ -594,18 +592,16 @@ void __init smp_init(void)
  * early_boot_irqs_disabled is set.  Use local_irq_save/restore() instead
  * of local_irq_disable/enable().
  */
-int on_each_cpu(void (*func) (void *info), void *info, int wait)
+void on_each_cpu(void (*func) (void *info), void *info, int wait)
 {
         unsigned long flags;
-        int ret = 0;
 
         preempt_disable();
-        ret = smp_call_function(func, info, wait);
+        smp_call_function(func, info, wait);
         local_irq_save(flags);
         func(info);
         local_irq_restore(flags);
         preempt_enable();
-        return ret;
 }
 EXPORT_SYMBOL(on_each_cpu);
 
diff --git a/kernel/up.c b/kernel/up.c
index 483c9962c999..862b460ab97a 100644
--- a/kernel/up.c
+++ b/kernel/up.c
@@ -35,14 +35,13 @@ int smp_call_function_single_async(int cpu, call_single_data_t *csd)
 }
 EXPORT_SYMBOL(smp_call_function_single_async);
 
-int on_each_cpu(smp_call_func_t func, void *info, int wait)
+void on_each_cpu(smp_call_func_t func, void *info, int wait)
 {
         unsigned long flags;
 
         local_irq_save(flags);
         func(info);
         local_irq_restore(flags);
-        return 0;
 }
 EXPORT_SYMBOL(on_each_cpu);