Subject: [PATCH 07/16] ARM: add prototype for function called only from asm

From: Arnd Bergmann <[email-masked]>
Date: Tue, 16 May 2023 17:45:56 +0200

From: Arnd Bergmann <[email-masked]>

When building with 'make W=1', the compiler warns about any function
definition that does not come with a prototype in a header, to ensure
it matches what the caller expects.

This includes functions that are only ever caller from assembly
code and don't technically need a declaration:

arch/arm/kernel/ftrace.c:227:6: error: no previous prototype for 'prepare_ftrace_return'
arch/arm/kernel/ptrace.c:850:16: error: no previous prototype for 'syscall_trace_enter'
arch/arm/kernel/ptrace.c:878:17: error: no previous prototype for 'syscall_trace_exit'
arch/arm/kernel/signal.c:601:1: error: no previous prototype for 'do_work_pending'
arch/arm/kernel/signal.c:672:17: error: no previous prototype for 'do_rseq_syscall'
arch/arm/kernel/suspend.c:75:6: error: no previous prototype for '__cpu_suspend_save'
arch/arm/kernel/traps.c:451:17: error: no previous prototype for 'do_undefinstr'
arch/arm/kernel/traps.c:516:39: error: no previous prototype for 'handle_fiq_as_nmi'
arch/arm/kernel/traps.c:535:17: error: no previous prototype for 'bad_mode'
arch/arm/kernel/traps.c:608:16: error: no previous prototype for 'arm_syscall'
arch/arm/kernel/traps.c:734:1: error: no previous prototype for 'baddataabort'
arch/arm/kernel/traps.c:774:17: error: no previous prototype for '__div0'
arch/arm/kernel/traps.c:97:6: error: no previous prototype for 'dump_backtrace_stm'
arch/arm/kernel/unwind.c:40:6: error: no previous prototype for '__aeabi_unwind_cpp_pr0'
arch/arm/kernel/unwind.c:45:6: error: no previous prototype for '__aeabi_unwind_cpp_pr1'
arch/arm/kernel/unwind.c:50:6: error: no previous prototype for '__aeabi_unwind_cpp_pr2'
arch/arm/mm/fault.c:554:1: error: no previous prototype for 'do_DataAbort'
arch/arm/mm/fault.c:584:1: error: no previous prototype for 'do_PrefetchAbort'
arch/arm/mm/proc-v7-bugs.c:280:6: error: no previous prototype for 'cpu_v7_ca8_ibe'
arch/arm/mm/proc-v7-bugs.c:293:6: error: no previous prototype for 'cpu_v7_bugs_init'
arch/arm/vdso/vgettimeofday.c:36:6: error: no previous prototype for '__aeabi_unwind_cpp_pr0'
arch/arm/vdso/vgettimeofday.c:40:6: error: no previous prototype for '__aeabi_unwind_cpp_pr1'
arch/arm/vdso/vgettimeofday.c:44:6: error: no previous prototype for '__aeabi_unwind_cpp_pr2'
arch/arm/vfp/vfpmodule.c:323:6: error: no previous prototype for 'VFP_bounce'

Add the prototypes anyway, to allow enabling this warning by default in
the future.

Signed-off-by: Arnd Bergmann <[email-masked]>
---
 arch/arm/include/asm/ftrace.h  | 4 ++++
 arch/arm/include/asm/ptrace.h  | 3 +++
 arch/arm/include/asm/signal.h  | 5 +++++
 arch/arm/include/asm/spectre.h | 4 ++++
 arch/arm/include/asm/suspend.h | 1 +
 arch/arm/include/asm/traps.h   | 9 +++++++++
 arch/arm/include/asm/unwind.h  | 4 ++++
 arch/arm/include/asm/vfp.h     | 1 +
 arch/arm/mm/fault.h            | 4 ++++
 9 files changed, 35 insertions(+)

diff --git a/arch/arm/include/asm/ftrace.h b/arch/arm/include/asm/ftrace.h
index 4e29bff7556d..3b2d84ec11f3 100644
--- a/arch/arm/include/asm/ftrace.h
+++ b/arch/arm/include/asm/ftrace.h
@@ -73,6 +73,10 @@ static inline bool arch_syscall_match_sym_name(const char *sym,
 	return !strcasecmp(sym, name);
 }
 
+void prepare_ftrace_return(unsigned long *parent, unsigned long self,
+			   unsigned long frame_pointer,
+			   unsigned long stack_pointer);
+
 #endif /* ifndef __ASSEMBLY__ */
 
 #endif /* _ASM_ARM_FTRACE */
diff --git a/arch/arm/include/asm/ptrace.h b/arch/arm/include/asm/ptrace.h
index 483b8ddfcb82..7f44e88d1f25 100644
--- a/arch/arm/include/asm/ptrace.h
+++ b/arch/arm/include/asm/ptrace.h
@@ -193,5 +193,8 @@ static inline unsigned long it_advance(unsigned long cpsr)
 	return cpsr;
 }
 
+int syscall_trace_enter(struct pt_regs *regs);
+void syscall_trace_exit(struct pt_regs *regs);
+
 #endif /* __ASSEMBLY__ */
 #endif
diff --git a/arch/arm/include/asm/signal.h b/arch/arm/include/asm/signal.h
index 430be7774402..8b84092d1518 100644
--- a/arch/arm/include/asm/signal.h
+++ b/arch/arm/include/asm/signal.h
@@ -22,4 +22,9 @@ typedef struct {
 #define __ARCH_HAS_SA_RESTORER
 
 #include <asm/sigcontext.h>
+
+void do_rseq_syscall(struct pt_regs *regs);
+int do_work_pending(struct pt_regs *regs, unsigned int thread_flags,
+		    int syscall);
+
 #endif
diff --git a/arch/arm/include/asm/spectre.h b/arch/arm/include/asm/spectre.h
index 85f9e538fb32..d9c28b3b6b62 100644
--- a/arch/arm/include/asm/spectre.h
+++ b/arch/arm/include/asm/spectre.h
@@ -35,4 +35,8 @@ static inline void spectre_v2_update_state(unsigned int state,
 
 int spectre_bhb_update_vectors(unsigned int method);
 
+void cpu_v7_ca8_ibe(void);
+void cpu_v7_ca15_ibe(void);
+void cpu_v7_bugs_init(void);
+
 #endif
diff --git a/arch/arm/include/asm/suspend.h b/arch/arm/include/asm/suspend.h
index 506314265c6f..be81b9ca2ea1 100644
--- a/arch/arm/include/asm/suspend.h
+++ b/arch/arm/include/asm/suspend.h
@@ -13,5 +13,6 @@ extern void cpu_resume(void);
 extern void cpu_resume_no_hyp(void);
 extern void cpu_resume_arm(void);
 extern int cpu_suspend(unsigned long, int (*)(unsigned long));
+extern void __cpu_suspend_save(u32 *ptr, u32 ptrsz, u32 sp, u32 *save_ptr);
 
 #endif
diff --git a/arch/arm/include/asm/traps.h b/arch/arm/include/asm/traps.h
index 987fefb0a4db..0aaefe3e1700 100644
--- a/arch/arm/include/asm/traps.h
+++ b/arch/arm/include/asm/traps.h
@@ -35,4 +35,13 @@ extern void ptrace_break(struct pt_regs *regs);
 
 extern void *vectors_page;
 
+asmlinkage void dump_backtrace_stm(u32 *stack, u32 instruction, const char *loglvl);
+asmlinkage void do_undefinstr(struct pt_regs *regs);
+asmlinkage void handle_fiq_as_nmi(struct pt_regs *regs);
+asmlinkage void bad_mode(struct pt_regs *regs, int reason);
+asmlinkage int arm_syscall(int no, struct pt_regs *regs);
+asmlinkage void baddataabort(int code, unsigned long instr, struct pt_regs *regs);
+asmlinkage void __div0(void);
+asmlinkage void handle_bad_stack(struct pt_regs *regs);
+
 #endif
diff --git a/arch/arm/include/asm/unwind.h b/arch/arm/include/asm/unwind.h
index b51f85417f58..d60b09a5acfc 100644
--- a/arch/arm/include/asm/unwind.h
+++ b/arch/arm/include/asm/unwind.h
@@ -40,6 +40,10 @@ extern void unwind_table_del(struct unwind_table *tab);
 extern void unwind_backtrace(struct pt_regs *regs, struct task_struct *tsk,
 			     const char *loglvl);
 
+void __aeabi_unwind_cpp_pr0(void);
+void __aeabi_unwind_cpp_pr1(void);
+void __aeabi_unwind_cpp_pr2(void);
+
 #endif	/* !__ASSEMBLY__ */
 
 #ifdef CONFIG_ARM_UNWIND
diff --git a/arch/arm/include/asm/vfp.h b/arch/arm/include/asm/vfp.h
index 157ea3426158..5b57b8768bac 100644
--- a/arch/arm/include/asm/vfp.h
+++ b/arch/arm/include/asm/vfp.h
@@ -102,6 +102,7 @@
 
 #ifndef __ASSEMBLY__
 void vfp_disable(void);
+void VFP_bounce(u32 trigger, u32 fpexc, struct pt_regs *regs);
 #endif
 
 #endif /* __ASM_VFP_H */
diff --git a/arch/arm/mm/fault.h b/arch/arm/mm/fault.h
index 54927ba1fa6e..e8f8c1902544 100644
--- a/arch/arm/mm/fault.h
+++ b/arch/arm/mm/fault.h
@@ -37,5 +37,9 @@ static inline int fsr_fs(unsigned int fsr)
 
 void do_bad_area(unsigned long addr, unsigned int fsr, struct pt_regs *regs);
 void early_abt_enable(void);
+asmlinkage void do_DataAbort(unsigned long addr, unsigned int fsr,
+			     struct pt_regs *regs);
+asmlinkage void do_PrefetchAbort(unsigned long addr, unsigned int ifsr,
+				 struct pt_regs *regs);
 
 #endif	/* __ARCH_ARM_FAULT_H */
-- 
2.39.2

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