Most of ARCHs use empty ftrace_dyn_arch_init(), introduce a weak common
ftrace_dyn_arch_init() to cleanup them.
Signed-off-by: Weizhao Ouyang <[email protected]>
Acked-by: Heiko Carstens <[email protected]> (s390)
---
Changes in v2:
-- correct CONFIG_DYNAMIC_FTRACE on PowerPC
-- add Acked-by tag
---
arch/arm/kernel/ftrace.c | 5 -----
arch/arm64/kernel/ftrace.c | 5 -----
arch/csky/kernel/ftrace.c | 5 -----
arch/ia64/kernel/ftrace.c | 6 ------
arch/microblaze/kernel/ftrace.c | 5 -----
arch/mips/include/asm/ftrace.h | 2 ++
arch/nds32/kernel/ftrace.c | 5 -----
arch/parisc/kernel/ftrace.c | 5 -----
arch/powerpc/include/asm/ftrace.h | 4 ++++
arch/riscv/kernel/ftrace.c | 5 -----
arch/s390/kernel/ftrace.c | 5 -----
arch/sh/kernel/ftrace.c | 5 -----
arch/sparc/kernel/ftrace.c | 5 -----
arch/x86/kernel/ftrace.c | 5 -----
include/linux/ftrace.h | 1 -
kernel/trace/ftrace.c | 5 +++++
16 files changed, 11 insertions(+), 62 deletions(-)
diff --git a/arch/arm/kernel/ftrace.c b/arch/arm/kernel/ftrace.c
index 3c83b5d29697..a006585e1c09 100644
--- a/arch/arm/kernel/ftrace.c
+++ b/arch/arm/kernel/ftrace.c
@@ -193,11 +193,6 @@ int ftrace_make_nop(struct module *mod,
return ret;
}
-
-int __init ftrace_dyn_arch_init(void)
-{
- return 0;
-}
#endif /* CONFIG_DYNAMIC_FTRACE */
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
diff --git a/arch/arm64/kernel/ftrace.c b/arch/arm64/kernel/ftrace.c
index 7f467bd9db7a..fc62dfe73f93 100644
--- a/arch/arm64/kernel/ftrace.c
+++ b/arch/arm64/kernel/ftrace.c
@@ -236,11 +236,6 @@ void arch_ftrace_update_code(int command)
command |= FTRACE_MAY_SLEEP;
ftrace_modify_all_code(command);
}
-
-int __init ftrace_dyn_arch_init(void)
-{
- return 0;
-}
#endif /* CONFIG_DYNAMIC_FTRACE */
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
diff --git a/arch/csky/kernel/ftrace.c b/arch/csky/kernel/ftrace.c
index b4a7ec1517ff..50bfcf129078 100644
--- a/arch/csky/kernel/ftrace.c
+++ b/arch/csky/kernel/ftrace.c
@@ -133,11 +133,6 @@ int ftrace_update_ftrace_func(ftrace_func_t func)
(unsigned long)func, true, true);
return ret;
}
-
-int __init ftrace_dyn_arch_init(void)
-{
- return 0;
-}
#endif /* CONFIG_DYNAMIC_FTRACE */
#ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
diff --git a/arch/ia64/kernel/ftrace.c b/arch/ia64/kernel/ftrace.c
index b2ab2d58fb30..d6360fd404ab 100644
--- a/arch/ia64/kernel/ftrace.c
+++ b/arch/ia64/kernel/ftrace.c
@@ -194,9 +194,3 @@ int ftrace_update_ftrace_func(ftrace_func_t func)
flush_icache_range(addr, addr + 16);
return 0;
}
-
-/* run from kstop_machine */
-int __init ftrace_dyn_arch_init(void)
-{
- return 0;
-}
diff --git a/arch/microblaze/kernel/ftrace.c b/arch/microblaze/kernel/ftrace.c
index 224eea40e1ee..188749d62709 100644
--- a/arch/microblaze/kernel/ftrace.c
+++ b/arch/microblaze/kernel/ftrace.c
@@ -163,11 +163,6 @@ int ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr)
return ret;
}
-int __init ftrace_dyn_arch_init(void)
-{
- return 0;
-}
-
int ftrace_update_ftrace_func(ftrace_func_t func)
{
unsigned long ip = (unsigned long)(&ftrace_call);
diff --git a/arch/mips/include/asm/ftrace.h b/arch/mips/include/asm/ftrace.h
index b463f2aa5a61..ed013e767390 100644
--- a/arch/mips/include/asm/ftrace.h
+++ b/arch/mips/include/asm/ftrace.h
@@ -76,6 +76,8 @@ do { \
#ifdef CONFIG_DYNAMIC_FTRACE
+int __init ftrace_dyn_arch_init(void);
+
static inline unsigned long ftrace_call_adjust(unsigned long addr)
{
return addr;
diff --git a/arch/nds32/kernel/ftrace.c b/arch/nds32/kernel/ftrace.c
index 0e23e3a8df6b..f0ef4842d191 100644
--- a/arch/nds32/kernel/ftrace.c
+++ b/arch/nds32/kernel/ftrace.c
@@ -84,11 +84,6 @@ void _ftrace_caller(unsigned long parent_ip)
/* restore all state needed by the compiler epilogue */
}
-int __init ftrace_dyn_arch_init(void)
-{
- return 0;
-}
-
static unsigned long gen_sethi_insn(unsigned long addr)
{
unsigned long opcode = 0x46000000;
diff --git a/arch/parisc/kernel/ftrace.c b/arch/parisc/kernel/ftrace.c
index 0a1e75af5382..01581f715737 100644
--- a/arch/parisc/kernel/ftrace.c
+++ b/arch/parisc/kernel/ftrace.c
@@ -94,11 +94,6 @@ int ftrace_disable_ftrace_graph_caller(void)
#endif
#ifdef CONFIG_DYNAMIC_FTRACE
-
-int __init ftrace_dyn_arch_init(void)
-{
- return 0;
-}
int ftrace_update_ftrace_func(ftrace_func_t func)
{
return 0;
diff --git a/arch/powerpc/include/asm/ftrace.h b/arch/powerpc/include/asm/ftrace.h
index debe8c4f7062..d59f67c0225f 100644
--- a/arch/powerpc/include/asm/ftrace.h
+++ b/arch/powerpc/include/asm/ftrace.h
@@ -61,6 +61,10 @@ struct dyn_arch_ftrace {
};
#endif /* __ASSEMBLY__ */
+#ifdef CONFIG_DYNAMIC_FTRACE
+int __init ftrace_dyn_arch_init(void);
+#endif /* CONFIG_DYNAMIC_FTRACE */
+
#ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
#define ARCH_SUPPORTS_FTRACE_OPS 1
#endif
diff --git a/arch/riscv/kernel/ftrace.c b/arch/riscv/kernel/ftrace.c
index 7f1e5203de88..4716f4cdc038 100644
--- a/arch/riscv/kernel/ftrace.c
+++ b/arch/riscv/kernel/ftrace.c
@@ -154,11 +154,6 @@ int ftrace_update_ftrace_func(ftrace_func_t func)
return ret;
}
-
-int __init ftrace_dyn_arch_init(void)
-{
- return 0;
-}
#endif
#ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
diff --git a/arch/s390/kernel/ftrace.c b/arch/s390/kernel/ftrace.c
index 0a464d328467..3fd80397ff52 100644
--- a/arch/s390/kernel/ftrace.c
+++ b/arch/s390/kernel/ftrace.c
@@ -262,11 +262,6 @@ int ftrace_update_ftrace_func(ftrace_func_t func)
return 0;
}
-int __init ftrace_dyn_arch_init(void)
-{
- return 0;
-}
-
void arch_ftrace_update_code(int command)
{
if (ftrace_shared_hotpatch_trampoline(NULL))
diff --git a/arch/sh/kernel/ftrace.c b/arch/sh/kernel/ftrace.c
index 295c43315bbe..930001bb8c6a 100644
--- a/arch/sh/kernel/ftrace.c
+++ b/arch/sh/kernel/ftrace.c
@@ -252,11 +252,6 @@ int ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr)
return ftrace_modify_code(rec->ip, old, new);
}
-
-int __init ftrace_dyn_arch_init(void)
-{
- return 0;
-}
#endif /* CONFIG_DYNAMIC_FTRACE */
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
diff --git a/arch/sparc/kernel/ftrace.c b/arch/sparc/kernel/ftrace.c
index 684b84ce397f..eaead3da8e03 100644
--- a/arch/sparc/kernel/ftrace.c
+++ b/arch/sparc/kernel/ftrace.c
@@ -82,11 +82,6 @@ int ftrace_update_ftrace_func(ftrace_func_t func)
new = ftrace_call_replace(ip, (unsigned long)func);
return ftrace_modify_code(ip, old, new);
}
-
-int __init ftrace_dyn_arch_init(void)
-{
- return 0;
-}
#endif
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
diff --git a/arch/x86/kernel/ftrace.c b/arch/x86/kernel/ftrace.c
index 1b3ce3b4a2a2..23d221a9a3cd 100644
--- a/arch/x86/kernel/ftrace.c
+++ b/arch/x86/kernel/ftrace.c
@@ -252,11 +252,6 @@ void arch_ftrace_update_code(int command)
ftrace_modify_all_code(command);
}
-int __init ftrace_dyn_arch_init(void)
-{
- return 0;
-}
-
/* Currently only x86_64 supports dynamic trampolines */
#ifdef CONFIG_X86_64
diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h
index 832e65f06754..f1eca123d89d 100644
--- a/include/linux/ftrace.h
+++ b/include/linux/ftrace.h
@@ -573,7 +573,6 @@ ftrace_set_early_filter(struct ftrace_ops *ops, char *buf, int enable);
/* defined in arch */
extern int ftrace_ip_converted(unsigned long ip);
-extern int ftrace_dyn_arch_init(void);
extern void ftrace_replace_code(int enable);
extern int ftrace_update_ftrace_func(ftrace_func_t func);
extern void ftrace_caller(void);
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index 7efbc8aaf7f6..4c090323198d 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -6846,6 +6846,11 @@ void __init ftrace_free_init_mem(void)
ftrace_free_mem(NULL, start, end);
}
+int __init __weak ftrace_dyn_arch_init(void)
+{
+ return 0;
+}
+
void __init ftrace_init(void)
{
extern unsigned long __start_mcount_loc[];
--
2.30.2
Weizhao Ouyang <[email protected]> writes:
> Most of ARCHs use empty ftrace_dyn_arch_init(), introduce a weak common
> ftrace_dyn_arch_init() to cleanup them.
>
> Signed-off-by: Weizhao Ouyang <[email protected]>
> Acked-by: Heiko Carstens <[email protected]> (s390)
>
> ---
>
> Changes in v2:
> -- correct CONFIG_DYNAMIC_FTRACE on PowerPC
> -- add Acked-by tag
> diff --git a/arch/powerpc/include/asm/ftrace.h b/arch/powerpc/include/asm/ftrace.h
> index debe8c4f7062..d59f67c0225f 100644
> --- a/arch/powerpc/include/asm/ftrace.h
> +++ b/arch/powerpc/include/asm/ftrace.h
> @@ -61,6 +61,10 @@ struct dyn_arch_ftrace {
> };
> #endif /* __ASSEMBLY__ */
>
> +#ifdef CONFIG_DYNAMIC_FTRACE
> +int __init ftrace_dyn_arch_init(void);
> +#endif /* CONFIG_DYNAMIC_FTRACE */
> +
> #ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
> #define ARCH_SUPPORTS_FTRACE_OPS 1
> #endif
That breaks the build for powerpc:
/linux/arch/powerpc/include/asm/ftrace.h: Assembler messages:
/linux/arch/powerpc/include/asm/ftrace.h:65: Error: unrecognized opcode: `int'
make[4]: *** [/linux/scripts/Makefile.build:352: arch/powerpc/kernel/trace/ftrace_64.o] Error 1
make[3]: *** [/linux/scripts/Makefile.build:514: arch/powerpc/kernel/trace] Error 2
make[2]: *** [/linux/scripts/Makefile.build:514: arch/powerpc/kernel] Error 2
make[1]: *** [/linux/Makefile:1861: arch/powerpc] Error 2
make[1]: *** Waiting for unfinished jobs....
It needs to be inside an #ifndef __ASSEMBLY__ section.
cheers
On 2021/9/6 22:22, Michael Ellerman wrote:
> Weizhao Ouyang <[email protected]> writes:
>> Most of ARCHs use empty ftrace_dyn_arch_init(), introduce a weak common
>> ftrace_dyn_arch_init() to cleanup them.
>>
>> Signed-off-by: Weizhao Ouyang <[email protected]>
>> Acked-by: Heiko Carstens <[email protected]> (s390)
>>
>> ---
>>
>> Changes in v2:
>> -- correct CONFIG_DYNAMIC_FTRACE on PowerPC
>> -- add Acked-by tag
>> diff --git a/arch/powerpc/include/asm/ftrace.h b/arch/powerpc/include/asm/ftrace.h
>> index debe8c4f7062..d59f67c0225f 100644
>> --- a/arch/powerpc/include/asm/ftrace.h
>> +++ b/arch/powerpc/include/asm/ftrace.h
>> @@ -61,6 +61,10 @@ struct dyn_arch_ftrace {
>> };
>> #endif /* __ASSEMBLY__ */
>>
>> +#ifdef CONFIG_DYNAMIC_FTRACE
>> +int __init ftrace_dyn_arch_init(void);
>> +#endif /* CONFIG_DYNAMIC_FTRACE */
>> +
>> #ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
>> #define ARCH_SUPPORTS_FTRACE_OPS 1
>> #endif
> That breaks the build for powerpc:
>
> /linux/arch/powerpc/include/asm/ftrace.h: Assembler messages:
> /linux/arch/powerpc/include/asm/ftrace.h:65: Error: unrecognized opcode: `int'
> make[4]: *** [/linux/scripts/Makefile.build:352: arch/powerpc/kernel/trace/ftrace_64.o] Error 1
> make[3]: *** [/linux/scripts/Makefile.build:514: arch/powerpc/kernel/trace] Error 2
> make[2]: *** [/linux/scripts/Makefile.build:514: arch/powerpc/kernel] Error 2
> make[1]: *** [/linux/Makefile:1861: arch/powerpc] Error 2
> make[1]: *** Waiting for unfinished jobs....
>
> It needs to be inside an #ifndef __ASSEMBLY__ section.
>
> cheers
Thanks for reply, I'll fix it up.
On 9/6/21 1:16 PM, Weizhao Ouyang wrote:
> Most of ARCHs use empty ftrace_dyn_arch_init(), introduce a weak common
> ftrace_dyn_arch_init() to cleanup them.
>
> Signed-off-by: Weizhao Ouyang <[email protected]>
> Acked-by: Heiko Carstens <[email protected]> (s390)
Acked-by: Helge Deller <[email protected]> # parisc
Thanks,
Helge
> ---
>
> Changes in v2:
> -- correct CONFIG_DYNAMIC_FTRACE on PowerPC
> -- add Acked-by tag
>
> ---
> arch/arm/kernel/ftrace.c | 5 -----
> arch/arm64/kernel/ftrace.c | 5 -----
> arch/csky/kernel/ftrace.c | 5 -----
> arch/ia64/kernel/ftrace.c | 6 ------
> arch/microblaze/kernel/ftrace.c | 5 -----
> arch/mips/include/asm/ftrace.h | 2 ++
> arch/nds32/kernel/ftrace.c | 5 -----
> arch/parisc/kernel/ftrace.c | 5 -----
> arch/powerpc/include/asm/ftrace.h | 4 ++++
> arch/riscv/kernel/ftrace.c | 5 -----
> arch/s390/kernel/ftrace.c | 5 -----
> arch/sh/kernel/ftrace.c | 5 -----
> arch/sparc/kernel/ftrace.c | 5 -----
> arch/x86/kernel/ftrace.c | 5 -----
> include/linux/ftrace.h | 1 -
> kernel/trace/ftrace.c | 5 +++++
> 16 files changed, 11 insertions(+), 62 deletions(-)
>
> diff --git a/arch/arm/kernel/ftrace.c b/arch/arm/kernel/ftrace.c
> index 3c83b5d29697..a006585e1c09 100644
> --- a/arch/arm/kernel/ftrace.c
> +++ b/arch/arm/kernel/ftrace.c
> @@ -193,11 +193,6 @@ int ftrace_make_nop(struct module *mod,
>
> return ret;
> }
> -
> -int __init ftrace_dyn_arch_init(void)
> -{
> - return 0;
> -}
> #endif /* CONFIG_DYNAMIC_FTRACE */
>
> #ifdef CONFIG_FUNCTION_GRAPH_TRACER
> diff --git a/arch/arm64/kernel/ftrace.c b/arch/arm64/kernel/ftrace.c
> index 7f467bd9db7a..fc62dfe73f93 100644
> --- a/arch/arm64/kernel/ftrace.c
> +++ b/arch/arm64/kernel/ftrace.c
> @@ -236,11 +236,6 @@ void arch_ftrace_update_code(int command)
> command |= FTRACE_MAY_SLEEP;
> ftrace_modify_all_code(command);
> }
> -
> -int __init ftrace_dyn_arch_init(void)
> -{
> - return 0;
> -}
> #endif /* CONFIG_DYNAMIC_FTRACE */
>
> #ifdef CONFIG_FUNCTION_GRAPH_TRACER
> diff --git a/arch/csky/kernel/ftrace.c b/arch/csky/kernel/ftrace.c
> index b4a7ec1517ff..50bfcf129078 100644
> --- a/arch/csky/kernel/ftrace.c
> +++ b/arch/csky/kernel/ftrace.c
> @@ -133,11 +133,6 @@ int ftrace_update_ftrace_func(ftrace_func_t func)
> (unsigned long)func, true, true);
> return ret;
> }
> -
> -int __init ftrace_dyn_arch_init(void)
> -{
> - return 0;
> -}
> #endif /* CONFIG_DYNAMIC_FTRACE */
>
> #ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
> diff --git a/arch/ia64/kernel/ftrace.c b/arch/ia64/kernel/ftrace.c
> index b2ab2d58fb30..d6360fd404ab 100644
> --- a/arch/ia64/kernel/ftrace.c
> +++ b/arch/ia64/kernel/ftrace.c
> @@ -194,9 +194,3 @@ int ftrace_update_ftrace_func(ftrace_func_t func)
> flush_icache_range(addr, addr + 16);
> return 0;
> }
> -
> -/* run from kstop_machine */
> -int __init ftrace_dyn_arch_init(void)
> -{
> - return 0;
> -}
> diff --git a/arch/microblaze/kernel/ftrace.c b/arch/microblaze/kernel/ftrace.c
> index 224eea40e1ee..188749d62709 100644
> --- a/arch/microblaze/kernel/ftrace.c
> +++ b/arch/microblaze/kernel/ftrace.c
> @@ -163,11 +163,6 @@ int ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr)
> return ret;
> }
>
> -int __init ftrace_dyn_arch_init(void)
> -{
> - return 0;
> -}
> -
> int ftrace_update_ftrace_func(ftrace_func_t func)
> {
> unsigned long ip = (unsigned long)(&ftrace_call);
> diff --git a/arch/mips/include/asm/ftrace.h b/arch/mips/include/asm/ftrace.h
> index b463f2aa5a61..ed013e767390 100644
> --- a/arch/mips/include/asm/ftrace.h
> +++ b/arch/mips/include/asm/ftrace.h
> @@ -76,6 +76,8 @@ do { \
>
>
> #ifdef CONFIG_DYNAMIC_FTRACE
> +int __init ftrace_dyn_arch_init(void);
> +
> static inline unsigned long ftrace_call_adjust(unsigned long addr)
> {
> return addr;
> diff --git a/arch/nds32/kernel/ftrace.c b/arch/nds32/kernel/ftrace.c
> index 0e23e3a8df6b..f0ef4842d191 100644
> --- a/arch/nds32/kernel/ftrace.c
> +++ b/arch/nds32/kernel/ftrace.c
> @@ -84,11 +84,6 @@ void _ftrace_caller(unsigned long parent_ip)
> /* restore all state needed by the compiler epilogue */
> }
>
> -int __init ftrace_dyn_arch_init(void)
> -{
> - return 0;
> -}
> -
> static unsigned long gen_sethi_insn(unsigned long addr)
> {
> unsigned long opcode = 0x46000000;
> diff --git a/arch/parisc/kernel/ftrace.c b/arch/parisc/kernel/ftrace.c
> index 0a1e75af5382..01581f715737 100644
> --- a/arch/parisc/kernel/ftrace.c
> +++ b/arch/parisc/kernel/ftrace.c
> @@ -94,11 +94,6 @@ int ftrace_disable_ftrace_graph_caller(void)
> #endif
>
> #ifdef CONFIG_DYNAMIC_FTRACE
> -
> -int __init ftrace_dyn_arch_init(void)
> -{
> - return 0;
> -}
> int ftrace_update_ftrace_func(ftrace_func_t func)
> {
> return 0;
> diff --git a/arch/powerpc/include/asm/ftrace.h b/arch/powerpc/include/asm/ftrace.h
> index debe8c4f7062..d59f67c0225f 100644
> --- a/arch/powerpc/include/asm/ftrace.h
> +++ b/arch/powerpc/include/asm/ftrace.h
> @@ -61,6 +61,10 @@ struct dyn_arch_ftrace {
> };
> #endif /* __ASSEMBLY__ */
>
> +#ifdef CONFIG_DYNAMIC_FTRACE
> +int __init ftrace_dyn_arch_init(void);
> +#endif /* CONFIG_DYNAMIC_FTRACE */
> +
> #ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
> #define ARCH_SUPPORTS_FTRACE_OPS 1
> #endif
> diff --git a/arch/riscv/kernel/ftrace.c b/arch/riscv/kernel/ftrace.c
> index 7f1e5203de88..4716f4cdc038 100644
> --- a/arch/riscv/kernel/ftrace.c
> +++ b/arch/riscv/kernel/ftrace.c
> @@ -154,11 +154,6 @@ int ftrace_update_ftrace_func(ftrace_func_t func)
>
> return ret;
> }
> -
> -int __init ftrace_dyn_arch_init(void)
> -{
> - return 0;
> -}
> #endif
>
> #ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
> diff --git a/arch/s390/kernel/ftrace.c b/arch/s390/kernel/ftrace.c
> index 0a464d328467..3fd80397ff52 100644
> --- a/arch/s390/kernel/ftrace.c
> +++ b/arch/s390/kernel/ftrace.c
> @@ -262,11 +262,6 @@ int ftrace_update_ftrace_func(ftrace_func_t func)
> return 0;
> }
>
> -int __init ftrace_dyn_arch_init(void)
> -{
> - return 0;
> -}
> -
> void arch_ftrace_update_code(int command)
> {
> if (ftrace_shared_hotpatch_trampoline(NULL))
> diff --git a/arch/sh/kernel/ftrace.c b/arch/sh/kernel/ftrace.c
> index 295c43315bbe..930001bb8c6a 100644
> --- a/arch/sh/kernel/ftrace.c
> +++ b/arch/sh/kernel/ftrace.c
> @@ -252,11 +252,6 @@ int ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr)
>
> return ftrace_modify_code(rec->ip, old, new);
> }
> -
> -int __init ftrace_dyn_arch_init(void)
> -{
> - return 0;
> -}
> #endif /* CONFIG_DYNAMIC_FTRACE */
>
> #ifdef CONFIG_FUNCTION_GRAPH_TRACER
> diff --git a/arch/sparc/kernel/ftrace.c b/arch/sparc/kernel/ftrace.c
> index 684b84ce397f..eaead3da8e03 100644
> --- a/arch/sparc/kernel/ftrace.c
> +++ b/arch/sparc/kernel/ftrace.c
> @@ -82,11 +82,6 @@ int ftrace_update_ftrace_func(ftrace_func_t func)
> new = ftrace_call_replace(ip, (unsigned long)func);
> return ftrace_modify_code(ip, old, new);
> }
> -
> -int __init ftrace_dyn_arch_init(void)
> -{
> - return 0;
> -}
> #endif
>
> #ifdef CONFIG_FUNCTION_GRAPH_TRACER
> diff --git a/arch/x86/kernel/ftrace.c b/arch/x86/kernel/ftrace.c
> index 1b3ce3b4a2a2..23d221a9a3cd 100644
> --- a/arch/x86/kernel/ftrace.c
> +++ b/arch/x86/kernel/ftrace.c
> @@ -252,11 +252,6 @@ void arch_ftrace_update_code(int command)
> ftrace_modify_all_code(command);
> }
>
> -int __init ftrace_dyn_arch_init(void)
> -{
> - return 0;
> -}
> -
> /* Currently only x86_64 supports dynamic trampolines */
> #ifdef CONFIG_X86_64
>
> diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h
> index 832e65f06754..f1eca123d89d 100644
> --- a/include/linux/ftrace.h
> +++ b/include/linux/ftrace.h
> @@ -573,7 +573,6 @@ ftrace_set_early_filter(struct ftrace_ops *ops, char *buf, int enable);
>
> /* defined in arch */
> extern int ftrace_ip_converted(unsigned long ip);
> -extern int ftrace_dyn_arch_init(void);
> extern void ftrace_replace_code(int enable);
> extern int ftrace_update_ftrace_func(ftrace_func_t func);
> extern void ftrace_caller(void);
> diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
> index 7efbc8aaf7f6..4c090323198d 100644
> --- a/kernel/trace/ftrace.c
> +++ b/kernel/trace/ftrace.c
> @@ -6846,6 +6846,11 @@ void __init ftrace_free_init_mem(void)
> ftrace_free_mem(NULL, start, end);
> }
>
> +int __init __weak ftrace_dyn_arch_init(void)
> +{
> + return 0;
> +}
> +
> void __init ftrace_init(void)
> {
> extern unsigned long __start_mcount_loc[];
>