[v2] LoongArch: Fix some build warnings with W=1 option

  There are some building warnings when building LoongArch kernel
with W=1 option as following, this patch fixes these building
warnings.

arch/loongarch/kernel/traps.c:496:25: warning: no previous prototype
for 'do_fpe' [-Wmissing-prototypes]
  496 | asmlinkage void noinstr do_fpe(struct pt_regs *regs
      |                         ^~~~~~
arch/loongarch/kernel/syscall.c:21:40: warning: initialized field
overwritten [-Woverride-init]
   21 | #define __SYSCALL(nr, call)     [nr] = (call),
      |                                        ^

Signed-off-by: Bibo Mao <maobibo@loongson.cn>
---
Changes in v2:
  1. Remove modification about file arch/loongarch/kernel/asm-offsets.c,
since it is refacted now.
  2. Add more modification and eliminate almost all building warnings in
arch/loongarch tree.
---
 arch/loongarch/include/asm/exception.h | 26 ++++++++++++++++++++++++++
 arch/loongarch/include/asm/io.h        |  4 +---
 arch/loongarch/include/asm/smp.h       |  1 +
 arch/loongarch/include/asm/syscall.h   |  1 +
 arch/loongarch/kernel/Makefile         |  1 +
 arch/loongarch/kernel/process.c        |  1 +
 arch/loongarch/kernel/signal.c         |  6 +++---
 arch/loongarch/kernel/smp.c            |  3 +++
 arch/loongarch/kernel/syscall.c        |  1 +
 arch/loongarch/kernel/time.c           |  2 +-
 arch/loongarch/kernel/traps.c          | 10 ++++++----
 arch/loongarch/mm/fault.c              |  1 +
 arch/loongarch/mm/tlb.c                |  2 +-
 13 files changed, 47 insertions(+), 12 deletions(-)
 create mode 100644 arch/loongarch/include/asm/exception.h


base-commit: 9fdfb15a3dbf818e06be514f4abbfc071004cbe7
  

Hi, Bibo,

I applied this patch with even more fixes:
https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson.git/commit/?h=loongarch-next&id=c718a0bad75ccef117000223b00fd6a14f849135

Huacai

On Wed, Sep 20, 2023 at 11:28 AM Bibo Mao <maobibo@loongson.cn> wrote:
>
> There are some building warnings when building LoongArch kernel
> with W=1 option as following, this patch fixes these building
> warnings.
>
> arch/loongarch/kernel/traps.c:496:25: warning: no previous prototype
> for 'do_fpe' [-Wmissing-prototypes]
>   496 | asmlinkage void noinstr do_fpe(struct pt_regs *regs
>       |                         ^~~~~~
> arch/loongarch/kernel/syscall.c:21:40: warning: initialized field
> overwritten [-Woverride-init]
>    21 | #define __SYSCALL(nr, call)     [nr] = (call),
>       |                                        ^
>
> Signed-off-by: Bibo Mao <maobibo@loongson.cn>
> ---
> Changes in v2:
>   1. Remove modification about file arch/loongarch/kernel/asm-offsets.c,
> since it is refacted now.
>   2. Add more modification and eliminate almost all building warnings in
> arch/loongarch tree.
> ---
>  arch/loongarch/include/asm/exception.h | 26 ++++++++++++++++++++++++++
>  arch/loongarch/include/asm/io.h        |  4 +---
>  arch/loongarch/include/asm/smp.h       |  1 +
>  arch/loongarch/include/asm/syscall.h   |  1 +
>  arch/loongarch/kernel/Makefile         |  1 +
>  arch/loongarch/kernel/process.c        |  1 +
>  arch/loongarch/kernel/signal.c         |  6 +++---
>  arch/loongarch/kernel/smp.c            |  3 +++
>  arch/loongarch/kernel/syscall.c        |  1 +
>  arch/loongarch/kernel/time.c           |  2 +-
>  arch/loongarch/kernel/traps.c          | 10 ++++++----
>  arch/loongarch/mm/fault.c              |  1 +
>  arch/loongarch/mm/tlb.c                |  2 +-
>  13 files changed, 47 insertions(+), 12 deletions(-)
>  create mode 100644 arch/loongarch/include/asm/exception.h
>
> diff --git a/arch/loongarch/include/asm/exception.h b/arch/loongarch/include/asm/exception.h
> new file mode 100644
> index 000000000000..ffa068aa6ac9
> --- /dev/null
> +++ b/arch/loongarch/include/asm/exception.h
> @@ -0,0 +1,26 @@
> +/* SPDX-License-Identifier: GPL-2.0-only */
> +
> +#ifndef __ASM_EXCEPTION_H
> +#define __ASM_EXCEPTION_H
> +
> +#include <asm/ptrace.h>
> +
> +asmlinkage void noinstr do_fpe(struct pt_regs *regs, unsigned long fcsr);
> +asmlinkage void noinstr do_ade(struct pt_regs *regs);
> +asmlinkage void noinstr do_ale(struct pt_regs *regs);
> +asmlinkage void noinstr do_bce(struct pt_regs *regs);
> +asmlinkage void noinstr do_bp(struct pt_regs *regs);
> +asmlinkage void noinstr do_watch(struct pt_regs *regs);
> +asmlinkage void noinstr do_ri(struct pt_regs *regs);
> +asmlinkage void noinstr do_fpu(struct pt_regs *regs);
> +asmlinkage void noinstr do_lsx(struct pt_regs *regs);
> +asmlinkage void noinstr do_lasx(struct pt_regs *regs);
> +asmlinkage void noinstr do_lbt(struct pt_regs *regs);
> +asmlinkage void noinstr do_reserved(struct pt_regs *regs);
> +asmlinkage void cache_parity_error(void);
> +asmlinkage void noinstr handle_loongarch_irq(struct pt_regs *regs);
> +asmlinkage void noinstr do_vint(struct pt_regs *regs, unsigned long sp);
> +asmlinkage void __kprobes do_page_fault(struct pt_regs *regs,
> +                               unsigned long write, unsigned long address);
> +
> +#endif /* __ASM_EXCEPTION_H */
> diff --git a/arch/loongarch/include/asm/io.h b/arch/loongarch/include/asm/io.h
> index 0dcb36b32cb2..58bc88c5a9e5 100644
> --- a/arch/loongarch/include/asm/io.h
> +++ b/arch/loongarch/include/asm/io.h
> @@ -10,6 +10,7 @@
>
>  #include <asm/addrspace.h>
>  #include <asm/cpu.h>
> +#include <asm/early_ioremap.h>
>  #include <asm/page.h>
>  #include <asm/pgtable-bits.h>
>  #include <asm/string.h>
> @@ -19,9 +20,6 @@
>   */
>  #define page_to_phys(page)     ((phys_addr_t)page_to_pfn(page) << PAGE_SHIFT)
>
> -extern void __init __iomem *early_ioremap(u64 phys_addr, unsigned long size);
> -extern void __init early_iounmap(void __iomem *addr, unsigned long size);
> -
>  #define early_memremap early_ioremap
>  #define early_memunmap early_iounmap
>
> diff --git a/arch/loongarch/include/asm/smp.h b/arch/loongarch/include/asm/smp.h
> index 66ecb480c894..a845ed3a6456 100644
> --- a/arch/loongarch/include/asm/smp.h
> +++ b/arch/loongarch/include/asm/smp.h
> @@ -19,6 +19,7 @@ extern cpumask_t cpu_sibling_map[];
>  extern cpumask_t cpu_core_map[];
>  extern cpumask_t cpu_foreign_map[];
>
> +asmlinkage void start_secondary(void);
>  void loongson_smp_setup(void);
>  void loongson_prepare_cpus(unsigned int max_cpus);
>  void loongson_boot_secondary(int cpu, struct task_struct *idle);
> diff --git a/arch/loongarch/include/asm/syscall.h b/arch/loongarch/include/asm/syscall.h
> index e286dc58476e..089a58d2a45f 100644
> --- a/arch/loongarch/include/asm/syscall.h
> +++ b/arch/loongarch/include/asm/syscall.h
> @@ -20,6 +20,7 @@
>
>  extern void *sys_call_table[];
>
> +void noinstr do_syscall(struct pt_regs *regs);
>  static inline long syscall_get_nr(struct task_struct *task,
>                                   struct pt_regs *regs)
>  {
> diff --git a/arch/loongarch/kernel/Makefile b/arch/loongarch/kernel/Makefile
> index c56ea0b75448..1e94764005e1 100644
> --- a/arch/loongarch/kernel/Makefile
> +++ b/arch/loongarch/kernel/Makefile
> @@ -19,6 +19,7 @@ obj-$(CONFIG_CPU_HAS_LBT)     += lbt.o
>
>  obj-$(CONFIG_ARCH_STRICT_ALIGN)        += unaligned.o
>
> +CFLAGS_syscall.o       += $(call cc-option,-Wno-override-init,)
>  ifdef CONFIG_FUNCTION_TRACER
>    ifndef CONFIG_DYNAMIC_FTRACE
>      obj-y += mcount.o ftrace.o
> diff --git a/arch/loongarch/kernel/process.c b/arch/loongarch/kernel/process.c
> index 3cb082e0c992..767d94cce0de 100644
> --- a/arch/loongarch/kernel/process.c
> +++ b/arch/loongarch/kernel/process.c
> @@ -37,6 +37,7 @@
>  #include <asm/bootinfo.h>
>  #include <asm/cpu.h>
>  #include <asm/elf.h>
> +#include <asm/exec.h>
>  #include <asm/fpu.h>
>  #include <asm/lbt.h>
>  #include <asm/io.h>
> diff --git a/arch/loongarch/kernel/signal.c b/arch/loongarch/kernel/signal.c
> index 504fdfe85203..aa482eae5e79 100644
> --- a/arch/loongarch/kernel/signal.c
> +++ b/arch/loongarch/kernel/signal.c
> @@ -13,6 +13,7 @@
>  #include <linux/audit.h>
>  #include <linux/cache.h>
>  #include <linux/context_tracking.h>
> +#include <linux/entry-common.h>
>  #include <linux/irqflags.h>
>  #include <linux/sched.h>
>  #include <linux/mm.h>
> @@ -891,7 +892,7 @@ static unsigned long setup_extcontext(struct extctx_layout *extctx, unsigned lon
>         return new_sp;
>  }
>
> -void __user *get_sigframe(struct ksignal *ksig, struct pt_regs *regs,
> +static void __user *get_sigframe(struct ksignal *ksig, struct pt_regs *regs,
>                           struct extctx_layout *extctx)
>  {
>         unsigned long sp;
> @@ -921,8 +922,7 @@ void __user *get_sigframe(struct ksignal *ksig, struct pt_regs *regs,
>  /*
>   * Atomically swap in the new signal mask, and wait for a signal.
>   */
> -
> -asmlinkage long sys_rt_sigreturn(void)
> +SYSCALL_DEFINE0(rt_sigreturn)
>  {
>         int sig;
>         sigset_t set;
> diff --git a/arch/loongarch/kernel/smp.c b/arch/loongarch/kernel/smp.c
> index 6667b0a90f81..ef35c871244f 100644
> --- a/arch/loongarch/kernel/smp.c
> +++ b/arch/loongarch/kernel/smp.c
> @@ -13,6 +13,7 @@
>  #include <linux/cpumask.h>
>  #include <linux/init.h>
>  #include <linux/interrupt.h>
> +#include <linux/profile.h>
>  #include <linux/seq_file.h>
>  #include <linux/smp.h>
>  #include <linux/threads.h>
> @@ -556,10 +557,12 @@ void smp_send_stop(void)
>         smp_call_function(stop_this_cpu, NULL, 0);
>  }
>
> +#ifdef CONFIG_PROFILING
>  int setup_profiling_timer(unsigned int multiplier)
>  {
>         return 0;
>  }
> +#endif
>
>  static void flush_tlb_all_ipi(void *info)
>  {
> diff --git a/arch/loongarch/kernel/syscall.c b/arch/loongarch/kernel/syscall.c
> index 3fc4211db989..b73218ce55e8 100644
> --- a/arch/loongarch/kernel/syscall.c
> +++ b/arch/loongarch/kernel/syscall.c
> @@ -15,6 +15,7 @@
>  #include <asm/asm.h>
>  #include <asm/signal.h>
>  #include <asm/switch_to.h>
> +#include <asm/syscall.h>
>  #include <asm-generic/syscalls.h>
>
>  #undef __SYSCALL
> diff --git a/arch/loongarch/kernel/time.c b/arch/loongarch/kernel/time.c
> index c189e03cd5da..3064af94db9c 100644
> --- a/arch/loongarch/kernel/time.c
> +++ b/arch/loongarch/kernel/time.c
> @@ -29,7 +29,7 @@ static void constant_event_handler(struct clock_event_device *dev)
>  {
>  }
>
> -irqreturn_t constant_timer_interrupt(int irq, void *data)
> +static irqreturn_t constant_timer_interrupt(int irq, void *data)
>  {
>         int cpu = smp_processor_id();
>         struct clock_event_device *cd;
> diff --git a/arch/loongarch/kernel/traps.c b/arch/loongarch/kernel/traps.c
> index 65214774ef7c..e6429047b6d9 100644
> --- a/arch/loongarch/kernel/traps.c
> +++ b/arch/loongarch/kernel/traps.c
> @@ -35,6 +35,7 @@
>  #include <asm/branch.h>
>  #include <asm/break.h>
>  #include <asm/cpu.h>
> +#include <asm/exception.h>
>  #include <asm/fpu.h>
>  #include <asm/lbt.h>
>  #include <asm/inst.h>
> @@ -371,7 +372,7 @@ void show_regs(struct pt_regs *regs)
>         dump_stack();
>  }
>
> -void show_registers(struct pt_regs *regs)
> +static void show_registers(struct pt_regs *regs)
>  {
>         __show_regs(regs);
>         print_modules();
> @@ -439,7 +440,7 @@ static inline void setup_vint_size(unsigned int size)
>   * happen together with Overflow or Underflow, and `ptrace' can set
>   * any bits.
>   */
> -void force_fcsr_sig(unsigned long fcsr, void __user *fault_addr,
> +static void force_fcsr_sig(unsigned long fcsr, void __user *fault_addr,
>                      struct task_struct *tsk)
>  {
>         int si_code = FPE_FLTUNK;
> @@ -458,7 +459,8 @@ void force_fcsr_sig(unsigned long fcsr, void __user *fault_addr,
>         force_sig_fault(SIGFPE, si_code, fault_addr);
>  }
>
> -int process_fpemu_return(int sig, void __user *fault_addr, unsigned long fcsr)
> +static int process_fpemu_return(int sig, void __user *fault_addr,
> +                               unsigned long fcsr)
>  {
>         int si_code;
>
> @@ -824,7 +826,7 @@ asmlinkage void noinstr do_watch(struct pt_regs *regs)
>  asmlinkage void noinstr do_ri(struct pt_regs *regs)
>  {
>         int status = SIGILL;
> -       unsigned int opcode = 0;
> +       unsigned int __maybe_unused opcode;
>         unsigned int __user *era = (unsigned int __user *)exception_era(regs);
>         irqentry_state_t state = irqentry_enter(regs);
>
> diff --git a/arch/loongarch/mm/fault.c b/arch/loongarch/mm/fault.c
> index e6376e3dce86..02f2a9765524 100644
> --- a/arch/loongarch/mm/fault.c
> +++ b/arch/loongarch/mm/fault.c
> @@ -26,6 +26,7 @@
>  #include <linux/kfence.h>
>
>  #include <asm/branch.h>
> +#include <asm/exception.h>
>  #include <asm/mmu_context.h>
>  #include <asm/ptrace.h>
>
> diff --git a/arch/loongarch/mm/tlb.c b/arch/loongarch/mm/tlb.c
> index eb8572e201ea..2c0a411f23aa 100644
> --- a/arch/loongarch/mm/tlb.c
> +++ b/arch/loongarch/mm/tlb.c
> @@ -261,7 +261,7 @@ unsigned long pcpu_handlers[NR_CPUS];
>  #endif
>  extern long exception_handlers[VECSIZE * 128 / sizeof(long)];
>
> -void setup_tlb_handler(int cpu)
> +static void setup_tlb_handler(int cpu)
>  {
>         setup_ptwalker();
>         local_flush_tlb_all();
>
> base-commit: 9fdfb15a3dbf818e06be514f4abbfc071004cbe7
> --
> 2.27.0
>