linux-kernel - Re: [PATCH v1 05/15] powerpc: Remove address argument from bad_page

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Date:   Sun, 27 Dec 2020 13:43:45 +1000
From:   Nicholas Piggin <npiggin@...il.com>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        Michael Ellerman <mpe@...erman.id.au>,
        Paul Mackerras <paulus@...ba.org>
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH v1 05/15] powerpc: Remove address argument from
 bad_page_fault()

Excerpts from Christophe Leroy's message of December 22, 2020 11:28 pm:
> The address argument is not used by bad_page_fault().
> 
> Remove it.
> 
> Suggested-by: Nicholas Piggin <npiggin@...il.com>
> Signed-off-by: Christophe Leroy <christophe.leroy@...roup.eu>
> ---
>  arch/powerpc/include/asm/bug.h             | 4 ++--
>  arch/powerpc/kernel/entry_32.S             | 4 +---
>  arch/powerpc/kernel/exceptions-64e.S       | 3 +--
>  arch/powerpc/kernel/exceptions-64s.S       | 8 +++-----
>  arch/powerpc/kernel/traps.c                | 2 +-
>  arch/powerpc/mm/book3s64/hash_utils.c      | 2 +-
>  arch/powerpc/mm/book3s64/slb.c             | 2 +-
>  arch/powerpc/mm/fault.c                    | 6 +++---
>  arch/powerpc/platforms/8xx/machine_check.c | 2 +-
>  9 files changed, 14 insertions(+), 19 deletions(-)
> 
> diff --git a/arch/powerpc/include/asm/bug.h b/arch/powerpc/include/asm/bug.h
> index 464f8ca8a5c9..af8c164254d0 100644
> --- a/arch/powerpc/include/asm/bug.h
> +++ b/arch/powerpc/include/asm/bug.h
> @@ -112,8 +112,8 @@
>  
>  struct pt_regs;
>  extern int do_page_fault(struct pt_regs *, unsigned long, unsigned long);
> -extern void bad_page_fault(struct pt_regs *, unsigned long, int);
> -void __bad_page_fault(struct pt_regs *regs, unsigned long address, int sig);
> +void bad_page_fault(struct pt_regs *regs, int sig);
> +void __bad_page_fault(struct pt_regs *regs, int sig);
>  extern void _exception(int, struct pt_regs *, int, unsigned long);
>  extern void _exception_pkey(struct pt_regs *, unsigned long, int);
>  extern void die(const char *, struct pt_regs *, long);
> diff --git a/arch/powerpc/kernel/entry_32.S b/arch/powerpc/kernel/entry_32.S
> index 238eacfda7b0..abd95aebe73a 100644
> --- a/arch/powerpc/kernel/entry_32.S
> +++ b/arch/powerpc/kernel/entry_32.S
> @@ -671,15 +671,13 @@ ppc_swapcontext:
>  handle_page_fault:
>  	addi	r3,r1,STACK_FRAME_OVERHEAD
>  	bl	do_page_fault
> -	cmpwi	r3,0
> +	mr.	r4,r3

This looks like an unrelated change so I'll leave it out. Nice little 
improvement though.

Thanks,
Nick