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* [PATCH] init: consolidate trap_init()
@ 2021-04-14  8:58 Jisheng Zhang
  2021-04-14  9:10 ` Christophe Leroy
  2021-04-14 10:00 ` [PATCH v2] " Jisheng Zhang
  0 siblings, 2 replies; 5+ messages in thread
From: Jisheng Zhang @ 2021-04-14  8:58 UTC (permalink / raw)
  To: Vineet Gupta, Russell King, Yoshinori Sato, Brian Cain, Nick Hu,
	Greentime Hu, Vincent Chen, Ley Foon Tan, Jonas Bonn,
	Stefan Kristiansson, Stafford Horne, James E.J. Bottomley,
	Helge Deller, Michael Ellerman, Benjamin Herrenschmidt,
	Paul Mackerras, Paul Walmsley, Palmer Dabbelt, Albert Ou,
	Jeff Dike, Richard Weinberger, Anton Ivanov
  Cc: linux-snps-arc, linux-kernel, linux-arm-kernel, uclinux-h8-devel,
	linux-hexagon, openrisc, linux-parisc, linuxppc-dev, linux-riscv,
	linux-um, Anup Patel

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


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^ permalink raw reply	[flat|nested] 5+ messages in thread

* Re: [PATCH] init: consolidate trap_init()
  2021-04-14  8:58 [PATCH] init: consolidate trap_init() Jisheng Zhang
@ 2021-04-14  9:10 ` Christophe Leroy
  2021-04-14  9:27   ` Jisheng Zhang
  2021-04-14 10:00 ` [PATCH v2] " Jisheng Zhang
  1 sibling, 1 reply; 5+ messages in thread
From: Christophe Leroy @ 2021-04-14  9:10 UTC (permalink / raw)
  To: Jisheng Zhang, Vineet Gupta, Russell King, Yoshinori Sato,
	Brian Cain, Nick Hu, Greentime Hu, Vincent Chen, Ley Foon Tan,
	Jonas Bonn, Stefan Kristiansson, Stafford Horne,
	James E.J. Bottomley, Helge Deller, Michael Ellerman,
	Benjamin Herrenschmidt, Paul Mackerras, Paul Walmsley,
	Palmer Dabbelt, Albert Ou, Jeff Dike, Richard Weinberger,
	Anton Ivanov
  Cc: uclinux-h8-devel, linux-parisc, linux-hexagon, linux-um,
	linux-kernel, openrisc, Anup Patel, linux-riscv, linux-snps-arc,
	linuxppc-dev, linux-arm-kernel



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)
>   {
> 

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linux-riscv mailing list
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http://lists.infradead.org/mailman/listinfo/linux-riscv

^ permalink raw reply	[flat|nested] 5+ messages in thread

* Re: [PATCH] init: consolidate trap_init()
  2021-04-14  9:10 ` Christophe Leroy
@ 2021-04-14  9:27   ` Jisheng Zhang
  2021-04-14  9:38     ` Jisheng Zhang
  0 siblings, 1 reply; 5+ messages in thread
From: Jisheng Zhang @ 2021-04-14  9:27 UTC (permalink / raw)
  To: Christophe Leroy
  Cc: Vineet Gupta, Russell King, Yoshinori Sato, Brian Cain, Nick Hu,
	Greentime Hu, Vincent Chen, Ley Foon Tan, Jonas Bonn,
	Stefan Kristiansson, Stafford Horne, James E.J. Bottomley,
	Helge Deller, Michael Ellerman, Benjamin Herrenschmidt,
	Paul Mackerras, Paul Walmsley, Palmer Dabbelt, Albert Ou,
	Jeff Dike, Richard Weinberger, Anton Ivanov, uclinux-h8-devel,
	linux-parisc, linux-hexagon, linux-um, linux-kernel, openrisc,
	Anup Patel, linux-riscv, linux-snps-arc, linuxppc-dev,
	linux-arm-kernel

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)
> >   {
> >  


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^ permalink raw reply	[flat|nested] 5+ messages in thread

* Re: [PATCH] init: consolidate trap_init()
  2021-04-14  9:27   ` Jisheng Zhang
@ 2021-04-14  9:38     ` Jisheng Zhang
  0 siblings, 0 replies; 5+ messages in thread
From: Jisheng Zhang @ 2021-04-14  9:38 UTC (permalink / raw)
  To: Christophe Leroy
  Cc: Vineet Gupta, Russell King, Yoshinori Sato, Brian Cain, Nick Hu,
	Greentime Hu, Vincent Chen, Ley Foon Tan, Jonas Bonn,
	Stefan Kristiansson, Stafford Horne, James E.J. Bottomley,
	Helge Deller, Michael Ellerman, Benjamin Herrenschmidt,
	Paul Mackerras, Paul Walmsley, Palmer Dabbelt, Albert Ou,
	Jeff Dike, Richard Weinberger, Anton Ivanov, uclinux-h8-devel,
	linux-parisc, linux-hexagon, linux-um, linux-kernel, openrisc,
	Anup Patel, linux-riscv, linux-snps-arc, linuxppc-dev,
	linux-arm-kernel

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

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http://lists.infradead.org/mailman/listinfo/linux-riscv

^ permalink raw reply	[flat|nested] 5+ messages in thread

* [PATCH v2] init: consolidate trap_init()
  2021-04-14  8:58 [PATCH] init: consolidate trap_init() Jisheng Zhang
  2021-04-14  9:10 ` Christophe Leroy
@ 2021-04-14 10:00 ` Jisheng Zhang
  1 sibling, 0 replies; 5+ messages in thread
From: Jisheng Zhang @ 2021-04-14 10:00 UTC (permalink / raw)
  To: Vineet Gupta, Russell King, Yoshinori Sato, Brian Cain, Nick Hu,
	Greentime Hu, Vincent Chen, Ley Foon Tan, Jonas Bonn,
	Stefan Kristiansson, Stafford Horne, James E.J. Bottomley,
	Helge Deller, Michael Ellerman, Benjamin Herrenschmidt,
	Paul Mackerras, Paul Walmsley, Palmer Dabbelt, Albert Ou,
	Jeff Dike, Richard Weinberger, Anton Ivanov, Richard Henderson,
	Ivan Kokshaysky, Matt Turner, Michal Simek, David S. Miller,
	Christophe Leroy
  Cc: linux-snps-arc, linux-kernel, linux-arm-kernel, uclinux-h8-devel,
	linux-hexagon, openrisc, linux-parisc, linuxppc-dev, linux-riscv,
	linux-um, Anup Patel, linux-alpha, sparclinux

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


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Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-04-14  8:58 [PATCH] init: consolidate trap_init() Jisheng Zhang
2021-04-14  9:10 ` Christophe Leroy
2021-04-14  9:27   ` Jisheng Zhang
2021-04-14  9:38     ` Jisheng Zhang
2021-04-14 10:00 ` [PATCH v2] " Jisheng Zhang

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