x86/kernel: Fix more -Wmissing-prototypes warnings

... with the goal of eventually enabling -Wmissing-prototypes by
default. At least on x86.

Make functions static where possible, otherwise add prototypes or make
them visible through includes.

asm/trace/ changes courtesy of Steven Rostedt <rostedt@goodmis.org>.

Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Masami Hiramatsu <mhiramat@kernel.org>
Reviewed-by: Ingo Molnar <mingo@kernel.org>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> # ACPI + cpufreq bits
Cc: Andrew Banman <andrew.banman@hpe.com>
Cc: Dimitri Sivanich <dimitri.sivanich@hpe.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Mike Travis <mike.travis@hpe.com>
Cc: "Steven Rostedt (VMware)" <rostedt@goodmis.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Yi Wang <wang.yi59@zte.com.cn>
Cc: linux-acpi@vger.kernel.org

arch/x86/include/asm/setup.h

@@ -46,6 +46,9 @@ extern unsigned long saved_video_mode;
 
 extern void reserve_standard_io_resources(void);
 extern void i386_reserve_resources(void);
+extern unsigned long __startup_64(unsigned long physaddr, struct boot_params *bp);
+extern unsigned long __startup_secondary_64(void);
+extern int early_make_pgtable(unsigned long address);
 
 #ifdef CONFIG_X86_INTEL_MID
 extern void x86_intel_mid_early_setup(void);

arch/x86/include/asm/trace/exceptions.h

@@ -45,6 +45,7 @@ DEFINE_PAGE_FAULT_EVENT(page_fault_user);
 DEFINE_PAGE_FAULT_EVENT(page_fault_kernel);
 
 #undef TRACE_INCLUDE_PATH
+#undef TRACE_INCLUDE_FILE
 #define TRACE_INCLUDE_PATH .
 #define TRACE_INCLUDE_FILE exceptions
 #endif /*  _TRACE_PAGE_FAULT_H */

arch/x86/include/asm/trace/irq_vectors.h

@@ -389,6 +389,7 @@ TRACE_EVENT(vector_free_moved,
 #endif /* CONFIG_X86_LOCAL_APIC */
 
 #undef TRACE_INCLUDE_PATH
+#undef TRACE_INCLUDE_FILE
 #define TRACE_INCLUDE_PATH .
 #define TRACE_INCLUDE_FILE irq_vectors
 #endif /*  _TRACE_IRQ_VECTORS_H */

arch/x86/include/asm/traps.h

@@ -113,6 +113,11 @@ asmlinkage void smp_threshold_interrupt(struct pt_regs *regs);
 asmlinkage void smp_deferred_error_interrupt(struct pt_regs *regs);
 #endif
 
+void smp_apic_timer_interrupt(struct pt_regs *regs);
+void smp_spurious_interrupt(struct pt_regs *regs);
+void smp_error_interrupt(struct pt_regs *regs);
+asmlinkage void smp_irq_move_cleanup_interrupt(void);
+
 extern void ist_enter(struct pt_regs *regs);
 extern void ist_exit(struct pt_regs *regs);
 extern void ist_begin_non_atomic(struct pt_regs *regs);

arch/x86/kernel/apic/apic.c

@@ -44,6 +44,7 @@
 #include <asm/mpspec.h>
 #include <asm/i8259.h>
 #include <asm/proto.h>
+#include <asm/traps.h>
 #include <asm/apic.h>
 #include <asm/io_apic.h>
 #include <asm/desc.h>

arch/x86/kernel/apic/apic_flat_64.c

@@ -8,6 +8,7 @@
  * Martin Bligh, Andi Kleen, James Bottomley, John Stultz, and
  * James Cleverdon.
  */
+#include <linux/acpi.h>
 #include <linux/errno.h>
 #include <linux/threads.h>
 #include <linux/cpumask.h>
@@ -16,12 +17,12 @@
 #include <linux/ctype.h>
 #include <linux/hardirq.h>
 #include <linux/export.h>
-#include <asm/smp.h>
-#include <asm/apic.h>
-#include <asm/ipi.h>
-#include <asm/jailhouse_para.h>
 
-#include <linux/acpi.h>
+#include <asm/smp.h>
+#include <asm/ipi.h>
+#include <asm/apic.h>
+#include <asm/apic_flat_64.h>
+#include <asm/jailhouse_para.h>
 
 static struct apic apic_physflat;
 static struct apic apic_flat;

arch/x86/kernel/apic/vector.c

@@ -18,6 +18,7 @@
 #include <linux/slab.h>
 #include <asm/irqdomain.h>
 #include <asm/hw_irq.h>
+#include <asm/traps.h>
 #include <asm/apic.h>
 #include <asm/i8259.h>
 #include <asm/desc.h>

arch/x86/kernel/apic/x2apic_uv_x.c

@@ -1079,7 +1079,7 @@ late_initcall(uv_init_heartbeat);
 #endif /* !CONFIG_HOTPLUG_CPU */
 
 /* Direct Legacy VGA I/O traffic to designated IOH */
-int uv_set_vga_state(struct pci_dev *pdev, bool decode, unsigned int command_bits, u32 flags)
+static int uv_set_vga_state(struct pci_dev *pdev, bool decode, unsigned int command_bits, u32 flags)
 {
 	int domain, bus, rc;
 
@@ -1148,7 +1148,7 @@ static void get_mn(struct mn *mnp)
 	mnp->m_shift = mnp->m_val ? 64 - mnp->m_val : 0;
 }
 
-void __init uv_init_hub_info(struct uv_hub_info_s *hi)
+static void __init uv_init_hub_info(struct uv_hub_info_s *hi)
 {
 	union uvh_node_id_u node_id;
 	struct mn mn;

arch/x86/kernel/asm-offsets.c

@@ -29,7 +29,8 @@
 # include "asm-offsets_64.c"
 #endif
 
-void common(void) {
+static void __used common(void)
+{
 	BLANK();
 	OFFSET(TASK_threadsp, task_struct, thread.sp);
 #ifdef CONFIG_STACKPROTECTOR

arch/x86/kernel/cpu/amd.c

@@ -15,6 +15,7 @@
 #include <asm/smp.h>
 #include <asm/pci-direct.h>
 #include <asm/delay.h>
+#include <asm/debugreg.h>
 
 #ifdef CONFIG_X86_64
 # include <asm/mmconfig.h>

arch/x86/kernel/cpu/aperfmperf.c

@@ -12,6 +12,7 @@
 #include <linux/ktime.h>
 #include <linux/math64.h>
 #include <linux/percpu.h>
+#include <linux/cpufreq.h>
 #include <linux/smp.h>
 
 #include "cpu.h"

arch/x86/kernel/cpu/bugs.c

@@ -32,6 +32,8 @@
 #include <asm/e820/api.h>
 #include <asm/hypervisor.h>
 
+#include "cpu.h"
+
 static void __init spectre_v2_select_mitigation(void);
 static void __init ssb_select_mitigation(void);
 static void __init l1tf_select_mitigation(void);

arch/x86/kernel/cpu/cacheinfo.c

@@ -17,6 +17,7 @@
 #include <linux/pci.h>
 
 #include <asm/cpufeature.h>
+#include <asm/cacheinfo.h>
 #include <asm/amd_nb.h>
 #include <asm/smp.h>
 

arch/x86/kernel/cpu/scattered.c

@@ -5,9 +5,10 @@
 #include <linux/cpu.h>
 
 #include <asm/pat.h>
+#include <asm/apic.h>
 #include <asm/processor.h>
 
-#include <asm/apic.h>
+#include "cpu.h"
 
 struct cpuid_bit {
 	u16 feature;

arch/x86/kernel/cpu/topology.c

@@ -10,6 +10,8 @@
 #include <asm/pat.h>
 #include <asm/processor.h>
 
+#include "cpu.h"
+
 /* leaf 0xb SMT level */
 #define SMT_LEVEL	0
 

arch/x86/kernel/fpu/xstate.c

@@ -811,7 +811,7 @@ void fpu__resume_cpu(void)
  *
  * Note: does not work for compacted buffers.
  */
-void *__raw_xsave_addr(struct xregs_state *xsave, int xstate_feature_mask)
+static void *__raw_xsave_addr(struct xregs_state *xsave, int xstate_feature_mask)
 {
 	int feature_nr = fls64(xstate_feature_mask) - 1;
 

arch/x86/kernel/kprobes/core.c

@@ -66,6 +66,8 @@
 
 #include "common.h"
 
+void *trampoline_handler(struct pt_regs *regs);
+
 DEFINE_PER_CPU(struct kprobe *, current_kprobe) = NULL;
 DEFINE_PER_CPU(struct kprobe_ctlblk, kprobe_ctlblk);
 

arch/x86/kernel/sysfb_efi.c

@@ -19,12 +19,15 @@
 
 #include <linux/dmi.h>
 #include <linux/err.h>
+#include <linux/efi.h>
 #include <linux/init.h>
 #include <linux/kernel.h>
 #include <linux/mm.h>
 #include <linux/pci.h>
 #include <linux/screen_info.h>
 #include <video/vga.h>
+
+#include <asm/efi.h>
 #include <asm/sysfb.h>
 
 enum {

arch/x86/kernel/tracepoint.c

@@ -11,6 +11,7 @@
 #include <asm/hw_irq.h>
 #include <asm/desc.h>
 #include <asm/trace/exceptions.h>
+#include <asm/trace/irq_vectors.h>
 
 DEFINE_STATIC_KEY_FALSE(trace_pagefault_key);
 

include/acpi/cppc_acpi.h

@@ -142,5 +142,8 @@ extern int cppc_set_perf(int cpu, struct cppc_perf_ctrls *perf_ctrls);
 extern int cppc_get_perf_caps(int cpu, struct cppc_perf_caps *caps);
 extern int acpi_get_psd_map(struct cppc_cpudata **);
 extern unsigned int cppc_get_transition_latency(int cpu);
+extern bool cpc_ffh_supported(void);
+extern int cpc_read_ffh(int cpunum, struct cpc_reg *reg, u64 *val);
+extern int cpc_write_ffh(int cpunum, struct cpc_reg *reg, u64 val);
 
 #endif /* _CPPC_ACPI_H*/

include/linux/kprobes.h

@@ -379,6 +379,9 @@ int enable_kprobe(struct kprobe *kp);
 
 void dump_kprobe(struct kprobe *kp);
 
+void *alloc_insn_page(void);
+void free_insn_page(void *page);
+
 #else /* !CONFIG_KPROBES: */
 
 static inline int kprobes_built_in(void)