[PATCH] init: consolidate trap_init()

[PATCH] init: consolidate trap_init()

[Jisheng Zhang]

Many architectures implement the trap_init() as NOP, since there is
no such default for trap_init(), this empty stub is duplicated among
these architectures. Provide a generic but weak NOP implementation
to drop the empty stubs of trap_init() in these architectures.

Signed-off-by: Jisheng Zhang <Jisheng.Zhang@synaptics.com>
---
 arch/arc/kernel/traps.c      |  5 -----
 arch/arm/kernel/traps.c      |  5 -----
 arch/h8300/kernel/traps.c    | 13 -------------
 arch/hexagon/kernel/traps.c  |  4 ----
 arch/nds32/kernel/traps.c    |  5 -----
 arch/nios2/kernel/traps.c    |  5 -----
 arch/openrisc/kernel/traps.c |  5 -----
 arch/parisc/kernel/traps.c   |  4 ----
 arch/powerpc/kernel/traps.c  |  5 -----
 arch/riscv/kernel/traps.c    |  5 -----
 arch/um/kernel/trap.c        |  4 ----
 init/main.c                  |  2 ++
 12 files changed, 2 insertions(+), 60 deletions(-)

diff --git a/arch/arc/kernel/traps.c b/arch/arc/kernel/traps.c
index 57235e5c0cea..6b83e3f2b41c 100644
--- a/arch/arc/kernel/traps.c
+++ b/arch/arc/kernel/traps.c
@@ -20,11 +20,6 @@
 #include <asm/unaligned.h>
 #include <asm/kprobes.h>
 
-void __init trap_init(void)
-{
-	return;
-}
-
 void die(const char *str, struct pt_regs *regs, unsigned long address)
 {
 	show_kernel_fault_diag(str, regs, address);
diff --git a/arch/arm/kernel/traps.c b/arch/arm/kernel/traps.c
index 17d5a785df28..9baccef20392 100644
--- a/arch/arm/kernel/traps.c
+++ b/arch/arm/kernel/traps.c
@@ -780,11 +780,6 @@ void abort(void)
 	panic("Oops failed to kill thread");
 }
 
-void __init trap_init(void)
-{
-	return;
-}
-
 #ifdef CONFIG_KUSER_HELPERS
 static void __init kuser_init(void *vectors)
 {
diff --git a/arch/h8300/kernel/traps.c b/arch/h8300/kernel/traps.c
index 5d8b969cd8f3..c3a3ebf77fbb 100644
--- a/arch/h8300/kernel/traps.c
+++ b/arch/h8300/kernel/traps.c
@@ -30,19 +30,6 @@
 
 static DEFINE_SPINLOCK(die_lock);
 
-/*
- * this must be called very early as the kernel might
- * use some instruction that are emulated on the 060
- */
-
-void __init base_trap_init(void)
-{
-}
-
-void __init trap_init(void)
-{
-}
-
 asmlinkage void set_esp0(unsigned long ssp)
 {
 	current->thread.esp0 = ssp;
diff --git a/arch/hexagon/kernel/traps.c b/arch/hexagon/kernel/traps.c
index 904134b37232..edfc35dafeb1 100644
--- a/arch/hexagon/kernel/traps.c
+++ b/arch/hexagon/kernel/traps.c
@@ -28,10 +28,6 @@
 #define TRAP_SYSCALL	1
 #define TRAP_DEBUG	0xdb
 
-void __init trap_init(void)
-{
-}
-
 #ifdef CONFIG_GENERIC_BUG
 /* Maybe should resemble arch/sh/kernel/traps.c ?? */
 int is_valid_bugaddr(unsigned long addr)
diff --git a/arch/nds32/kernel/traps.c b/arch/nds32/kernel/traps.c
index ee0d9ae192a5..f06421c645af 100644
--- a/arch/nds32/kernel/traps.c
+++ b/arch/nds32/kernel/traps.c
@@ -183,11 +183,6 @@ void __pgd_error(const char *file, int line, unsigned long val)
 }
 
 extern char *exception_vector, *exception_vector_end;
-void __init trap_init(void)
-{
-	return;
-}
-
 void __init early_trap_init(void)
 {
 	unsigned long ivb = 0;
diff --git a/arch/nios2/kernel/traps.c b/arch/nios2/kernel/traps.c
index b172da4eb1a9..596986a74a26 100644
--- a/arch/nios2/kernel/traps.c
+++ b/arch/nios2/kernel/traps.c
@@ -105,11 +105,6 @@ void show_stack(struct task_struct *task, unsigned long *stack,
 	printk("%s\n", loglvl);
 }
 
-void __init trap_init(void)
-{
-	/* Nothing to do here */
-}
-
 /* Breakpoint handler */
 asmlinkage void breakpoint_c(struct pt_regs *fp)
 {
diff --git a/arch/openrisc/kernel/traps.c b/arch/openrisc/kernel/traps.c
index 4d61333c2623..aa1e709405ac 100644
--- a/arch/openrisc/kernel/traps.c
+++ b/arch/openrisc/kernel/traps.c
@@ -231,11 +231,6 @@ void unhandled_exception(struct pt_regs *regs, int ea, int vector)
 	die("Oops", regs, 9);
 }
 
-void __init trap_init(void)
-{
-	/* Nothing needs to be done */
-}
-
 asmlinkage void do_trap(struct pt_regs *regs, unsigned long address)
 {
 	force_sig_fault(SIGTRAP, TRAP_BRKPT, (void __user *)regs->pc);
diff --git a/arch/parisc/kernel/traps.c b/arch/parisc/kernel/traps.c
index 8d8441d4562a..747c328fb886 100644
--- a/arch/parisc/kernel/traps.c
+++ b/arch/parisc/kernel/traps.c
@@ -859,7 +859,3 @@ void  __init early_trap_init(void)
 
 	initialize_ivt(&fault_vector_20);
 }
-
-void __init trap_init(void)
-{
-}
diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c
index a44a30b0688c..e952bee89684 100644
--- a/arch/powerpc/kernel/traps.c
+++ b/arch/powerpc/kernel/traps.c
@@ -2207,11 +2207,6 @@ DEFINE_INTERRUPT_HANDLER(kernel_bad_stack)
 	die("Bad kernel stack pointer", regs, SIGABRT);
 }
 
-void __init trap_init(void)
-{
-}
-
-
 #ifdef CONFIG_PPC_EMULATED_STATS
 
 #define WARN_EMULATED_SETUP(type)	.type = { .name = #type }
diff --git a/arch/riscv/kernel/traps.c b/arch/riscv/kernel/traps.c
index 0879b5df11b9..b3f3d84de779 100644
--- a/arch/riscv/kernel/traps.c
+++ b/arch/riscv/kernel/traps.c
@@ -194,8 +194,3 @@ int is_valid_bugaddr(unsigned long pc)
 		return ((insn & __COMPRESSED_INSN_MASK) == __BUG_INSN_16);
 }
 #endif /* CONFIG_GENERIC_BUG */
-
-/* stvec & scratch is already set from head.S */
-void trap_init(void)
-{
-}
diff --git a/arch/um/kernel/trap.c b/arch/um/kernel/trap.c
index ad12f78bda7e..3198c4767387 100644
--- a/arch/um/kernel/trap.c
+++ b/arch/um/kernel/trap.c
@@ -311,7 +311,3 @@ void winch(int sig, struct siginfo *unused_si, struct uml_pt_regs *regs)
 {
 	do_IRQ(WINCH_IRQ, regs);
 }
-
-void trap_init(void)
-{
-}
diff --git a/init/main.c b/init/main.c
index 53b278845b88..4bdbe2928530 100644
--- a/init/main.c
+++ b/init/main.c
@@ -790,6 +790,8 @@ static inline void initcall_debug_enable(void)
 }
 #endif
 
+void __init __weak trap_init(void) { }
+
 /* Report memory auto-initialization states for this boot. */
 static void __init report_meminit(void)
 {
-- 
2.31.0

Re: [PATCH] init: consolidate trap_init()

[Christophe Leroy]

Le 14/04/2021 à 10:58, Jisheng Zhang a écrit :
> Many architectures implement the trap_init() as NOP, since there is
> no such default for trap_init(), this empty stub is duplicated among
> these architectures. Provide a generic but weak NOP implementation
> to drop the empty stubs of trap_init() in these architectures.

You define the weak function in the __init section.

Most but not all architectures had it in __init section.

And the remaining ones may not be defined in __init section. For instance look at the one in alpha 
architecture.

Have you checked that it is not a problem ? It would be good to say something about it in the commit 
description.


> 
> Signed-off-by: Jisheng Zhang <Jisheng.Zhang@synaptics.com>
> ---
>   arch/arc/kernel/traps.c      |  5 -----
>   arch/arm/kernel/traps.c      |  5 -----
>   arch/h8300/kernel/traps.c    | 13 -------------
>   arch/hexagon/kernel/traps.c  |  4 ----
>   arch/nds32/kernel/traps.c    |  5 -----
>   arch/nios2/kernel/traps.c    |  5 -----
>   arch/openrisc/kernel/traps.c |  5 -----
>   arch/parisc/kernel/traps.c   |  4 ----
>   arch/powerpc/kernel/traps.c  |  5 -----
>   arch/riscv/kernel/traps.c    |  5 -----
>   arch/um/kernel/trap.c        |  4 ----
>   init/main.c                  |  2 ++
>   12 files changed, 2 insertions(+), 60 deletions(-)
> 
> diff --git a/init/main.c b/init/main.c
> index 53b278845b88..4bdbe2928530 100644
> --- a/init/main.c
> +++ b/init/main.c
> @@ -790,6 +790,8 @@ static inline void initcall_debug_enable(void)
>   }
>   #endif
>   
> +void __init __weak trap_init(void) { }
> +

I think in a C file we don't try to save space as much as in a header file.

I would prefer something like:


void __init __weak trap_init(void)
{
}


>   /* Report memory auto-initialization states for this boot. */
>   static void __init report_meminit(void)
>   {
> 

Re: [PATCH] init: consolidate trap_init()

[Jisheng Zhang]

On Wed, 14 Apr 2021 11:10:42 +0200
Christophe Leroy <christophe.leroy@csgroup.eu> wrote:

> 
> Le 14/04/2021 à 10:58, Jisheng Zhang a écrit :
> > Many architectures implement the trap_init() as NOP, since there is
> > no such default for trap_init(), this empty stub is duplicated among
> > these architectures. Provide a generic but weak NOP implementation
> > to drop the empty stubs of trap_init() in these architectures.  
> 
> You define the weak function in the __init section.
> 
> Most but not all architectures had it in __init section.
> 
> And the remaining ones may not be defined in __init section. For instance look at the one in alpha
> architecture.
> 
> Have you checked that it is not a problem ? It would be good to say something about it in the commit
> description.

For those non-nop platforms, I can only test x86/arm64/, but both has
__init mark. I'm not sure whether this is a problem for alpha etc. Maybe
I can check which section the trap_init() sits. Or to avoid any possible
regression, I can add __init mark to those remaining ones without it in
preparation patches.

> 
> 
> >
> > Signed-off-by: Jisheng Zhang <Jisheng.Zhang@synaptics.com>
> > ---
> >   arch/arc/kernel/traps.c      |  5 -----
> >   arch/arm/kernel/traps.c      |  5 -----
> >   arch/h8300/kernel/traps.c    | 13 -------------
> >   arch/hexagon/kernel/traps.c  |  4 ----
> >   arch/nds32/kernel/traps.c    |  5 -----
> >   arch/nios2/kernel/traps.c    |  5 -----
> >   arch/openrisc/kernel/traps.c |  5 -----
> >   arch/parisc/kernel/traps.c   |  4 ----
> >   arch/powerpc/kernel/traps.c  |  5 -----
> >   arch/riscv/kernel/traps.c    |  5 -----
> >   arch/um/kernel/trap.c        |  4 ----
> >   init/main.c                  |  2 ++
> >   12 files changed, 2 insertions(+), 60 deletions(-)
> >
> > diff --git a/init/main.c b/init/main.c
> > index 53b278845b88..4bdbe2928530 100644
> > --- a/init/main.c
> > +++ b/init/main.c
> > @@ -790,6 +790,8 @@ static inline void initcall_debug_enable(void)
> >   }
> >   #endif
> >
> > +void __init __weak trap_init(void) { }
> > +  
> 
> I think in a C file we don't try to save space as much as in a header file.
> 

This is to follow most weak NOP implementations in init/main.c to make
the style unified in the same file. I'm not sure which is better.

> I would prefer something like:
> 
> 
> void __init __weak trap_init(void)
> {
> }
> 
> 
> >   /* Report memory auto-initialization states for this boot. */
> >   static void __init report_meminit(void)
> >   {
> >  

Re: [PATCH] init: consolidate trap_init()

[Jisheng Zhang]

On Wed, 14 Apr 2021 17:27:57 +0800
Jisheng Zhang <Jisheng.Zhang@synaptics.com> wrote:

> CAUTION: Email originated externally, do not click links or open attachments unless you recognize the sender and know the content is safe.
> 
> 
> On Wed, 14 Apr 2021 11:10:42 +0200
> Christophe Leroy <christophe.leroy@csgroup.eu> wrote:
> 
> >
> > Le 14/04/2021 à 10:58, Jisheng Zhang a écrit :  
> > > Many architectures implement the trap_init() as NOP, since there is
> > > no such default for trap_init(), this empty stub is duplicated among
> > > these architectures. Provide a generic but weak NOP implementation
> > > to drop the empty stubs of trap_init() in these architectures.  
> >
> > You define the weak function in the __init section.
> >
> > Most but not all architectures had it in __init section.
> >
> > And the remaining ones may not be defined in __init section. For instance look at the one in alpha
> > architecture.
> >
> > Have you checked that it is not a problem ? It would be good to say something about it in the commit
> > description.  
> 
> For those non-nop platforms, I can only test x86/arm64/, but both has
> __init mark. I'm not sure whether this is a problem for alpha etc. Maybe
> I can check which section the trap_init() sits. Or to avoid any possible
> regression, I can add __init mark to those remaining ones without it in
> preparation patches.
> 

Hi,

I found only three platforms don't have the __init marker for trap_init(), I
will add the __init marker in three preparation patches in new version.

thanks

[PATCH v2] init: consolidate trap_init()

[Jisheng Zhang]

Many architectures implement the trap_init() as NOP, since there is
no such default for trap_init(), this empty stub is duplicated among
these architectures. Provide a generic but weak NOP implementation
to drop the empty stubs of trap_init() in these architectures.

The alpha, microblaze and sparc32 have real trap_init() implementation
but the __init marker is missing, so add it to these three platforms.

Signed-off-by: Jisheng Zhang <Jisheng.Zhang@synaptics.com>
---
Since v1:
 - add __init marker to trap_init() for alpha, microblaze and sparc32
 - adjust the generic weak NOP trap_init() location to make it sits with
   other NOP implementations together

 arch/alpha/kernel/traps.c      |  2 +-
 arch/arc/kernel/traps.c        |  5 -----
 arch/arm/kernel/traps.c        |  5 -----
 arch/h8300/kernel/traps.c      | 13 -------------
 arch/hexagon/kernel/traps.c    |  4 ----
 arch/microblaze/kernel/traps.c |  2 +-
 arch/nds32/kernel/traps.c      |  5 -----
 arch/nios2/kernel/traps.c      |  5 -----
 arch/openrisc/kernel/traps.c   |  5 -----
 arch/parisc/kernel/traps.c     |  4 ----
 arch/powerpc/kernel/traps.c    |  5 -----
 arch/riscv/kernel/traps.c      |  5 -----
 arch/sparc/kernel/traps_32.c   |  2 +-
 arch/um/kernel/trap.c          |  4 ----
 init/main.c                    |  2 ++
 15 files changed, 5 insertions(+), 63 deletions(-)

diff --git a/arch/alpha/kernel/traps.c b/arch/alpha/kernel/traps.c
index 921d4b6e4d95..96b203199c6c 100644
--- a/arch/alpha/kernel/traps.c
+++ b/arch/alpha/kernel/traps.c
@@ -973,7 +973,7 @@ do_entUnaUser(void __user * va, unsigned long opcode,
 	return;
 }
 
-void
+void __init
 trap_init(void)
 {
 	/* Tell PAL-code what global pointer we want in the kernel.  */
diff --git a/arch/arc/kernel/traps.c b/arch/arc/kernel/traps.c
index 57235e5c0cea..6b83e3f2b41c 100644
--- a/arch/arc/kernel/traps.c
+++ b/arch/arc/kernel/traps.c
@@ -20,11 +20,6 @@
 #include <asm/unaligned.h>
 #include <asm/kprobes.h>
 
-void __init trap_init(void)
-{
-	return;
-}
-
 void die(const char *str, struct pt_regs *regs, unsigned long address)
 {
 	show_kernel_fault_diag(str, regs, address);
diff --git a/arch/arm/kernel/traps.c b/arch/arm/kernel/traps.c
index 17d5a785df28..9baccef20392 100644
--- a/arch/arm/kernel/traps.c
+++ b/arch/arm/kernel/traps.c
@@ -780,11 +780,6 @@ void abort(void)
 	panic("Oops failed to kill thread");
 }
 
-void __init trap_init(void)
-{
-	return;
-}
-
 #ifdef CONFIG_KUSER_HELPERS
 static void __init kuser_init(void *vectors)
 {
diff --git a/arch/h8300/kernel/traps.c b/arch/h8300/kernel/traps.c
index 5d8b969cd8f3..c3a3ebf77fbb 100644
--- a/arch/h8300/kernel/traps.c
+++ b/arch/h8300/kernel/traps.c
@@ -30,19 +30,6 @@
 
 static DEFINE_SPINLOCK(die_lock);
 
-/*
- * this must be called very early as the kernel might
- * use some instruction that are emulated on the 060
- */
-
-void __init base_trap_init(void)
-{
-}
-
-void __init trap_init(void)
-{
-}
-
 asmlinkage void set_esp0(unsigned long ssp)
 {
 	current->thread.esp0 = ssp;
diff --git a/arch/hexagon/kernel/traps.c b/arch/hexagon/kernel/traps.c
index 904134b37232..edfc35dafeb1 100644
--- a/arch/hexagon/kernel/traps.c
+++ b/arch/hexagon/kernel/traps.c
@@ -28,10 +28,6 @@
 #define TRAP_SYSCALL	1
 #define TRAP_DEBUG	0xdb
 
-void __init trap_init(void)
-{
-}
-
 #ifdef CONFIG_GENERIC_BUG
 /* Maybe should resemble arch/sh/kernel/traps.c ?? */
 int is_valid_bugaddr(unsigned long addr)
diff --git a/arch/microblaze/kernel/traps.c b/arch/microblaze/kernel/traps.c
index 94b6fe93147d..7c15704fe56e 100644
--- a/arch/microblaze/kernel/traps.c
+++ b/arch/microblaze/kernel/traps.c
@@ -18,7 +18,7 @@
 #include <asm/exceptions.h>
 #include <asm/unwind.h>
 
-void trap_init(void)
+void __init trap_init(void)
 {
 	__enable_hw_exceptions();
 }
diff --git a/arch/nds32/kernel/traps.c b/arch/nds32/kernel/traps.c
index ee0d9ae192a5..f06421c645af 100644
--- a/arch/nds32/kernel/traps.c
+++ b/arch/nds32/kernel/traps.c
@@ -183,11 +183,6 @@ void __pgd_error(const char *file, int line, unsigned long val)
 }
 
 extern char *exception_vector, *exception_vector_end;
-void __init trap_init(void)
-{
-	return;
-}
-
 void __init early_trap_init(void)
 {
 	unsigned long ivb = 0;
diff --git a/arch/nios2/kernel/traps.c b/arch/nios2/kernel/traps.c
index b172da4eb1a9..596986a74a26 100644
--- a/arch/nios2/kernel/traps.c
+++ b/arch/nios2/kernel/traps.c
@@ -105,11 +105,6 @@ void show_stack(struct task_struct *task, unsigned long *stack,
 	printk("%s\n", loglvl);
 }
 
-void __init trap_init(void)
-{
-	/* Nothing to do here */
-}
-
 /* Breakpoint handler */
 asmlinkage void breakpoint_c(struct pt_regs *fp)
 {
diff --git a/arch/openrisc/kernel/traps.c b/arch/openrisc/kernel/traps.c
index 4d61333c2623..aa1e709405ac 100644
--- a/arch/openrisc/kernel/traps.c
+++ b/arch/openrisc/kernel/traps.c
@@ -231,11 +231,6 @@ void unhandled_exception(struct pt_regs *regs, int ea, int vector)
 	die("Oops", regs, 9);
 }
 
-void __init trap_init(void)
-{
-	/* Nothing needs to be done */
-}
-
 asmlinkage void do_trap(struct pt_regs *regs, unsigned long address)
 {
 	force_sig_fault(SIGTRAP, TRAP_BRKPT, (void __user *)regs->pc);
diff --git a/arch/parisc/kernel/traps.c b/arch/parisc/kernel/traps.c
index 8d8441d4562a..747c328fb886 100644
--- a/arch/parisc/kernel/traps.c
+++ b/arch/parisc/kernel/traps.c
@@ -859,7 +859,3 @@ void  __init early_trap_init(void)
 
 	initialize_ivt(&fault_vector_20);
 }
-
-void __init trap_init(void)
-{
-}
diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c
index a44a30b0688c..e952bee89684 100644
--- a/arch/powerpc/kernel/traps.c
+++ b/arch/powerpc/kernel/traps.c
@@ -2207,11 +2207,6 @@ DEFINE_INTERRUPT_HANDLER(kernel_bad_stack)
 	die("Bad kernel stack pointer", regs, SIGABRT);
 }
 
-void __init trap_init(void)
-{
-}
-
-
 #ifdef CONFIG_PPC_EMULATED_STATS
 
 #define WARN_EMULATED_SETUP(type)	.type = { .name = #type }
diff --git a/arch/riscv/kernel/traps.c b/arch/riscv/kernel/traps.c
index 0879b5df11b9..b3f3d84de779 100644
--- a/arch/riscv/kernel/traps.c
+++ b/arch/riscv/kernel/traps.c
@@ -194,8 +194,3 @@ int is_valid_bugaddr(unsigned long pc)
 		return ((insn & __COMPRESSED_INSN_MASK) == __BUG_INSN_16);
 }
 #endif /* CONFIG_GENERIC_BUG */
-
-/* stvec & scratch is already set from head.S */
-void trap_init(void)
-{
-}
diff --git a/arch/sparc/kernel/traps_32.c b/arch/sparc/kernel/traps_32.c
index 247a0d9683b2..c4df20ec01e2 100644
--- a/arch/sparc/kernel/traps_32.c
+++ b/arch/sparc/kernel/traps_32.c
@@ -365,7 +365,7 @@ EXPORT_SYMBOL(do_BUG);
  * up here so that timer interrupts work during initialization.
  */
 
-void trap_init(void)
+void __init trap_init(void)
 {
 	extern void thread_info_offsets_are_bolixed_pete(void);
 
diff --git a/arch/um/kernel/trap.c b/arch/um/kernel/trap.c
index ad12f78bda7e..3198c4767387 100644
--- a/arch/um/kernel/trap.c
+++ b/arch/um/kernel/trap.c
@@ -311,7 +311,3 @@ void winch(int sig, struct siginfo *unused_si, struct uml_pt_regs *regs)
 {
 	do_IRQ(WINCH_IRQ, regs);
 }
-
-void trap_init(void)
-{
-}
diff --git a/init/main.c b/init/main.c
index 53b278845b88..8d14674c4e00 100644
--- a/init/main.c
+++ b/init/main.c
@@ -779,6 +779,8 @@ void __init __weak poking_init(void) { }
 
 void __init __weak pgtable_cache_init(void) { }
 
+void __init __weak trap_init(void) { }
+
 bool initcall_debug;
 core_param(initcall_debug, initcall_debug, bool, 0644);
 
-- 
2.31.0

Re: [PATCH v2] init: consolidate trap_init()

[Helge Deller]

On 4/14/21 12:00 PM, Jisheng Zhang wrote:
> Many architectures implement the trap_init() as NOP, since there is
> no such default for trap_init(), this empty stub is duplicated among
> these architectures. Provide a generic but weak NOP implementation
> to drop the empty stubs of trap_init() in these architectures.
>
> The alpha, microblaze and sparc32 have real trap_init() implementation
> but the __init marker is missing, so add it to these three platforms.
>
> Signed-off-by: Jisheng Zhang <Jisheng.Zhang@synaptics.com>
> ---
> Since v1:
>   - add __init marker to trap_init() for alpha, microblaze and sparc32
>   - adjust the generic weak NOP trap_init() location to make it sits with
>     other NOP implementations together
>
>   arch/alpha/kernel/traps.c      |  2 +-
>   arch/arc/kernel/traps.c        |  5 -----
>   arch/arm/kernel/traps.c        |  5 -----
>   arch/h8300/kernel/traps.c      | 13 -------------
>   arch/hexagon/kernel/traps.c    |  4 ----
>   arch/microblaze/kernel/traps.c |  2 +-
>   arch/nds32/kernel/traps.c      |  5 -----
>   arch/nios2/kernel/traps.c      |  5 -----
>   arch/openrisc/kernel/traps.c   |  5 -----
>   arch/parisc/kernel/traps.c     |  4 ----
>   arch/powerpc/kernel/traps.c    |  5 -----
>   arch/riscv/kernel/traps.c      |  5 -----
>   arch/sparc/kernel/traps_32.c   |  2 +-
>   arch/um/kernel/trap.c          |  4 ----
>   init/main.c                    |  2 ++
>   15 files changed, 5 insertions(+), 63 deletions(-)


For parisc:

Acked-by: Helge Deller <deller@gmx.de> # parisc

Thanks!
Helge

>
> diff --git a/arch/alpha/kernel/traps.c b/arch/alpha/kernel/traps.c
> index 921d4b6e4d95..96b203199c6c 100644
> --- a/arch/alpha/kernel/traps.c
> +++ b/arch/alpha/kernel/traps.c
> @@ -973,7 +973,7 @@ do_entUnaUser(void __user * va, unsigned long opcode,
>   	return;
>   }
>
> -void
> +void __init
>   trap_init(void)
>   {
>   	/* Tell PAL-code what global pointer we want in the kernel.  */
> diff --git a/arch/arc/kernel/traps.c b/arch/arc/kernel/traps.c
> index 57235e5c0cea..6b83e3f2b41c 100644
> --- a/arch/arc/kernel/traps.c
> +++ b/arch/arc/kernel/traps.c
> @@ -20,11 +20,6 @@
>   #include <asm/unaligned.h>
>   #include <asm/kprobes.h>
>
> -void __init trap_init(void)
> -{
> -	return;
> -}
> -
>   void die(const char *str, struct pt_regs *regs, unsigned long address)
>   {
>   	show_kernel_fault_diag(str, regs, address);
> diff --git a/arch/arm/kernel/traps.c b/arch/arm/kernel/traps.c
> index 17d5a785df28..9baccef20392 100644
> --- a/arch/arm/kernel/traps.c
> +++ b/arch/arm/kernel/traps.c
> @@ -780,11 +780,6 @@ void abort(void)
>   	panic("Oops failed to kill thread");
>   }
>
> -void __init trap_init(void)
> -{
> -	return;
> -}
> -
>   #ifdef CONFIG_KUSER_HELPERS
>   static void __init kuser_init(void *vectors)
>   {
> diff --git a/arch/h8300/kernel/traps.c b/arch/h8300/kernel/traps.c
> index 5d8b969cd8f3..c3a3ebf77fbb 100644
> --- a/arch/h8300/kernel/traps.c
> +++ b/arch/h8300/kernel/traps.c
> @@ -30,19 +30,6 @@
>
>   static DEFINE_SPINLOCK(die_lock);
>
> -/*
> - * this must be called very early as the kernel might
> - * use some instruction that are emulated on the 060
> - */
> -
> -void __init base_trap_init(void)
> -{
> -}
> -
> -void __init trap_init(void)
> -{
> -}
> -
>   asmlinkage void set_esp0(unsigned long ssp)
>   {
>   	current->thread.esp0 = ssp;
> diff --git a/arch/hexagon/kernel/traps.c b/arch/hexagon/kernel/traps.c
> index 904134b37232..edfc35dafeb1 100644
> --- a/arch/hexagon/kernel/traps.c
> +++ b/arch/hexagon/kernel/traps.c
> @@ -28,10 +28,6 @@
>   #define TRAP_SYSCALL	1
>   #define TRAP_DEBUG	0xdb
>
> -void __init trap_init(void)
> -{
> -}
> -
>   #ifdef CONFIG_GENERIC_BUG
>   /* Maybe should resemble arch/sh/kernel/traps.c ?? */
>   int is_valid_bugaddr(unsigned long addr)
> diff --git a/arch/microblaze/kernel/traps.c b/arch/microblaze/kernel/traps.c
> index 94b6fe93147d..7c15704fe56e 100644
> --- a/arch/microblaze/kernel/traps.c
> +++ b/arch/microblaze/kernel/traps.c
> @@ -18,7 +18,7 @@
>   #include <asm/exceptions.h>
>   #include <asm/unwind.h>
>
> -void trap_init(void)
> +void __init trap_init(void)
>   {
>   	__enable_hw_exceptions();
>   }
> diff --git a/arch/nds32/kernel/traps.c b/arch/nds32/kernel/traps.c
> index ee0d9ae192a5..f06421c645af 100644
> --- a/arch/nds32/kernel/traps.c
> +++ b/arch/nds32/kernel/traps.c
> @@ -183,11 +183,6 @@ void __pgd_error(const char *file, int line, unsigned long val)
>   }
>
>   extern char *exception_vector, *exception_vector_end;
> -void __init trap_init(void)
> -{
> -	return;
> -}
> -
>   void __init early_trap_init(void)
>   {
>   	unsigned long ivb = 0;
> diff --git a/arch/nios2/kernel/traps.c b/arch/nios2/kernel/traps.c
> index b172da4eb1a9..596986a74a26 100644
> --- a/arch/nios2/kernel/traps.c
> +++ b/arch/nios2/kernel/traps.c
> @@ -105,11 +105,6 @@ void show_stack(struct task_struct *task, unsigned long *stack,
>   	printk("%s\n", loglvl);
>   }
>
> -void __init trap_init(void)
> -{
> -	/* Nothing to do here */
> -}
> -
>   /* Breakpoint handler */
>   asmlinkage void breakpoint_c(struct pt_regs *fp)
>   {
> diff --git a/arch/openrisc/kernel/traps.c b/arch/openrisc/kernel/traps.c
> index 4d61333c2623..aa1e709405ac 100644
> --- a/arch/openrisc/kernel/traps.c
> +++ b/arch/openrisc/kernel/traps.c
> @@ -231,11 +231,6 @@ void unhandled_exception(struct pt_regs *regs, int ea, int vector)
>   	die("Oops", regs, 9);
>   }
>
> -void __init trap_init(void)
> -{
> -	/* Nothing needs to be done */
> -}
> -
>   asmlinkage void do_trap(struct pt_regs *regs, unsigned long address)
>   {
>   	force_sig_fault(SIGTRAP, TRAP_BRKPT, (void __user *)regs->pc);
> diff --git a/arch/parisc/kernel/traps.c b/arch/parisc/kernel/traps.c
> index 8d8441d4562a..747c328fb886 100644
> --- a/arch/parisc/kernel/traps.c
> +++ b/arch/parisc/kernel/traps.c
> @@ -859,7 +859,3 @@ void  __init early_trap_init(void)
>
>   	initialize_ivt(&fault_vector_20);
>   }
> -
> -void __init trap_init(void)
> -{
> -}
> diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c
> index a44a30b0688c..e952bee89684 100644
> --- a/arch/powerpc/kernel/traps.c
> +++ b/arch/powerpc/kernel/traps.c
> @@ -2207,11 +2207,6 @@ DEFINE_INTERRUPT_HANDLER(kernel_bad_stack)
>   	die("Bad kernel stack pointer", regs, SIGABRT);
>   }
>
> -void __init trap_init(void)
> -{
> -}
> -
> -
>   #ifdef CONFIG_PPC_EMULATED_STATS
>
>   #define WARN_EMULATED_SETUP(type)	.type = { .name = #type }
> diff --git a/arch/riscv/kernel/traps.c b/arch/riscv/kernel/traps.c
> index 0879b5df11b9..b3f3d84de779 100644
> --- a/arch/riscv/kernel/traps.c
> +++ b/arch/riscv/kernel/traps.c
> @@ -194,8 +194,3 @@ int is_valid_bugaddr(unsigned long pc)
>   		return ((insn & __COMPRESSED_INSN_MASK) == __BUG_INSN_16);
>   }
>   #endif /* CONFIG_GENERIC_BUG */
> -
> -/* stvec & scratch is already set from head.S */
> -void trap_init(void)
> -{
> -}
> diff --git a/arch/sparc/kernel/traps_32.c b/arch/sparc/kernel/traps_32.c
> index 247a0d9683b2..c4df20ec01e2 100644
> --- a/arch/sparc/kernel/traps_32.c
> +++ b/arch/sparc/kernel/traps_32.c
> @@ -365,7 +365,7 @@ EXPORT_SYMBOL(do_BUG);
>    * up here so that timer interrupts work during initialization.
>    */
>
> -void trap_init(void)
> +void __init trap_init(void)
>   {
>   	extern void thread_info_offsets_are_bolixed_pete(void);
>
> diff --git a/arch/um/kernel/trap.c b/arch/um/kernel/trap.c
> index ad12f78bda7e..3198c4767387 100644
> --- a/arch/um/kernel/trap.c
> +++ b/arch/um/kernel/trap.c
> @@ -311,7 +311,3 @@ void winch(int sig, struct siginfo *unused_si, struct uml_pt_regs *regs)
>   {
>   	do_IRQ(WINCH_IRQ, regs);
>   }
> -
> -void trap_init(void)
> -{
> -}
> diff --git a/init/main.c b/init/main.c
> index 53b278845b88..8d14674c4e00 100644
> --- a/init/main.c
> +++ b/init/main.c
> @@ -779,6 +779,8 @@ void __init __weak poking_init(void) { }
>
>   void __init __weak pgtable_cache_init(void) { }
>
> +void __init __weak trap_init(void) { }
> +
>   bool initcall_debug;
>   core_param(initcall_debug, initcall_debug, bool, 0644);
>
>