Xtensa fixes for v6.6:

- fix build warnings from builds performed with W=1
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Merge tag 'xtensa-20230928' of https://github.com/jcmvbkbc/linux-xtensa

Pull Xtensa fixes from Max Filippov:

 - fix build warnings from builds performed with W=1

* tag 'xtensa-20230928' of https://github.com/jcmvbkbc/linux-xtensa:
  xtensa: boot/lib: fix function prototypes
  xtensa: umulsidi3: fix conditional expression
  xtensa: boot: don't add include-dirs
  xtensa: iss/network: make functions static
  xtensa: tlb: include <asm/tlb.h> for missing prototype
  xtensa: hw_breakpoint: include header for missing prototype
  xtensa: smp: add headers for missing function prototypes
  irqchip: irq-xtensa-mx: include header for missing prototype
  xtensa: traps: add <linux/cpu.h> for function prototype
  xtensa: stacktrace: include <asm/ftrace.h> for prototype
  xtensa: signal: include headers for function prototypes
  xtensa: processor.h: add init_arch() prototype
  xtensa: ptrace: add prototypes to <asm/ptrace.h>
  xtensa: irq: include <asm/traps.h>
  xtensa: fault: include <asm/traps.h>
  xtensa: add default definition for XCHAL_HAVE_DIV32

arch/xtensa/boot/Makefile

@@ -9,8 +9,7 @@
 
 
 # KBUILD_CFLAGS used when building rest of boot (takes effect recursively)
-KBUILD_CFLAGS	+= -fno-builtin -Iarch/$(ARCH)/boot/include
-HOSTFLAGS	+= -Iarch/$(ARCH)/boot/include
+KBUILD_CFLAGS	+= -fno-builtin
 
 subdir-y	:= lib
 targets		+= vmlinux.bin vmlinux.bin.gz

arch/xtensa/boot/lib/zmem.c

@@ -4,13 +4,14 @@
 /* bits taken from ppc */
 
 extern void *avail_ram, *end_avail;
+void gunzip(void *dst, int dstlen, unsigned char *src, int *lenp);
 
-void exit (void)
+static void exit(void)
 {
   for (;;);
 }
 
-void *zalloc(unsigned size)
+static void *zalloc(unsigned int size)
 {
         void *p = avail_ram;
 

arch/xtensa/include/asm/core.h

@@ -6,6 +6,10 @@
 
 #include <variant/core.h>
 
+#ifndef XCHAL_HAVE_DIV32
+#define XCHAL_HAVE_DIV32 0
+#endif
+
 #ifndef XCHAL_HAVE_EXCLUSIVE
 #define XCHAL_HAVE_EXCLUSIVE 0
 #endif

arch/xtensa/include/asm/hw_breakpoint.h

@@ -48,6 +48,7 @@ void arch_uninstall_hw_breakpoint(struct perf_event *bp);
 void hw_breakpoint_pmu_read(struct perf_event *bp);
 int check_hw_breakpoint(struct pt_regs *regs);
 void clear_ptrace_hw_breakpoint(struct task_struct *tsk);
+void restore_dbreak(void);
 
 #else
 

arch/xtensa/include/asm/processor.h

@@ -14,6 +14,8 @@
 
 #include <linux/compiler.h>
 #include <linux/stringify.h>
+
+#include <asm/bootparam.h>
 #include <asm/ptrace.h>
 #include <asm/types.h>
 #include <asm/regs.h>
@@ -217,6 +219,9 @@ struct mm_struct;
 
 extern unsigned long __get_wchan(struct task_struct *p);
 
+void init_arch(bp_tag_t *bp_start);
+void do_notify_resume(struct pt_regs *regs);
+
 #define KSTK_EIP(tsk)		(task_pt_regs(tsk)->pc)
 #define KSTK_ESP(tsk)		(task_pt_regs(tsk)->areg[1])
 

arch/xtensa/include/asm/ptrace.h

@@ -106,6 +106,9 @@ static inline unsigned long regs_return_value(struct pt_regs *regs)
 	return regs->areg[2];
 }
 
+int do_syscall_trace_enter(struct pt_regs *regs);
+void do_syscall_trace_leave(struct pt_regs *regs);
+
 #else	/* __ASSEMBLY__ */
 
 # include <asm/asm-offsets.h>

arch/xtensa/include/asm/smp.h

@@ -23,6 +23,7 @@ struct cpumask;
 void arch_send_call_function_ipi_mask(const struct cpumask *mask);
 void arch_send_call_function_single_ipi(int cpu);
 
+void secondary_start_kernel(void);
 void smp_init_cpus(void);
 void secondary_init_irq(void);
 void ipi_init(void);

arch/xtensa/include/asm/tlb.h

@@ -18,4 +18,6 @@
 
 #define __pte_free_tlb(tlb, pte, address)	pte_free((tlb)->mm, pte)
 
+void check_tlb_sanity(void);
+
 #endif	/* _XTENSA_TLB_H */

arch/xtensa/kernel/hw_breakpoint.c

@@ -13,6 +13,7 @@
 #include <linux/percpu.h>
 #include <linux/perf_event.h>
 #include <asm/core.h>
+#include <asm/hw_breakpoint.h>
 
 /* Breakpoint currently in use for each IBREAKA. */
 static DEFINE_PER_CPU(struct perf_event *, bp_on_reg[XCHAL_NUM_IBREAK]);

arch/xtensa/kernel/irq.c

@@ -28,6 +28,7 @@
 #include <asm/mxregs.h>
 #include <linux/uaccess.h>
 #include <asm/platform.h>
+#include <asm/traps.h>
 
 DECLARE_PER_CPU(unsigned long, nmi_count);
 

arch/xtensa/kernel/ptrace.c

@@ -541,7 +541,6 @@ long arch_ptrace(struct task_struct *child, long request,
 	return ret;
 }
 
-void do_syscall_trace_leave(struct pt_regs *regs);
 int do_syscall_trace_enter(struct pt_regs *regs)
 {
 	if (regs->syscall == NO_SYSCALL)

arch/xtensa/kernel/signal.c

@@ -26,6 +26,8 @@
 #include <linux/uaccess.h>
 #include <asm/cacheflush.h>
 #include <asm/coprocessor.h>
+#include <asm/processor.h>
+#include <asm/syscall.h>
 #include <asm/unistd.h>
 
 extern struct task_struct *coproc_owners[];

arch/xtensa/kernel/smp.c

@@ -21,6 +21,7 @@
 #include <linux/irq.h>
 #include <linux/kdebug.h>
 #include <linux/module.h>
+#include <linux/profile.h>
 #include <linux/sched/mm.h>
 #include <linux/sched/hotplug.h>
 #include <linux/sched/task_stack.h>

arch/xtensa/kernel/stacktrace.c

@@ -12,6 +12,7 @@
 #include <linux/sched.h>
 #include <linux/stacktrace.h>
 
+#include <asm/ftrace.h>
 #include <asm/stacktrace.h>
 #include <asm/traps.h>
 #include <linux/uaccess.h>

arch/xtensa/kernel/traps.c

@@ -23,6 +23,7 @@
  * for more details.
  */
 
+#include <linux/cpu.h>
 #include <linux/kernel.h>
 #include <linux/sched/signal.h>
 #include <linux/sched/debug.h>

arch/xtensa/lib/umulsidi3.S

@@ -3,7 +3,9 @@
 #include <asm/asmmacro.h>
 #include <asm/core.h>
 
-#if !XCHAL_HAVE_MUL16 && !XCHAL_HAVE_MUL32 && !XCHAL_HAVE_MAC16
+#if XCHAL_HAVE_MUL16 || XCHAL_HAVE_MUL32 || XCHAL_HAVE_MAC16
+#define XCHAL_NO_MUL 0
+#else
 #define XCHAL_NO_MUL 1
 #endif
 

arch/xtensa/mm/fault.c

@@ -20,6 +20,7 @@
 #include <asm/mmu_context.h>
 #include <asm/cacheflush.h>
 #include <asm/hardirq.h>
+#include <asm/traps.h>
 
 void bad_page_fault(struct pt_regs*, unsigned long, int);
 

arch/xtensa/mm/tlb.c

@@ -17,6 +17,7 @@
 #include <linux/mm.h>
 #include <asm/processor.h>
 #include <asm/mmu_context.h>
+#include <asm/tlb.h>
 #include <asm/tlbflush.h>
 #include <asm/cacheflush.h>
 

arch/xtensa/platforms/iss/network.c

@@ -201,7 +201,7 @@ static int tuntap_write(struct iss_net_private *lp, struct sk_buff **skb)
 	return simc_write(lp->tp.info.tuntap.fd, (*skb)->data, (*skb)->len);
 }
 
-unsigned short tuntap_protocol(struct sk_buff *skb)
+static unsigned short tuntap_protocol(struct sk_buff *skb)
 {
 	return eth_type_trans(skb, skb->dev);
 }
@@ -441,7 +441,7 @@ static int iss_net_change_mtu(struct net_device *dev, int new_mtu)
 	return -EINVAL;
 }
 
-void iss_net_user_timer_expire(struct timer_list *unused)
+static void iss_net_user_timer_expire(struct timer_list *unused)
 {
 }
 

drivers/irqchip/irq-xtensa-mx.c

@@ -12,6 +12,7 @@
 #include <linux/irqdomain.h>
 #include <linux/irq.h>
 #include <linux/irqchip.h>
+#include <linux/irqchip/xtensa-mx.h>
 #include <linux/of.h>
 
 #include <asm/mxregs.h>