linux-kernel - Re: [PATCH 2/5] powerpc: don't use asm-generic/ptrace.h

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Date:   Thu, 02 May 2019 13:30:26 +1000
From:   Michael Ellerman <mpe@...erman.id.au>
To:     Christoph Hellwig <hch@....de>, Oleg Nesterov <oleg@...hat.com>,
        Arnd Bergmann <arnd@...db.de>
Cc:     x86@...nel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mips@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        linux-sh@...r.kernel.org, linux-arch@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/5] powerpc: don't use asm-generic/ptrace.h

Christoph Hellwig <hch@....de> writes:

> Doing the indirection through macros for the regs accessors just
> makes them harder to read, so implement the helpers directly.
>
> Note that only the helpers actually used are implemented now.
>
> Signed-off-by: Christoph Hellwig <hch@....de>
> ---
>  arch/powerpc/include/asm/ptrace.h | 29 ++++++++++++++++++++++-------
>  1 file changed, 22 insertions(+), 7 deletions(-)

Looks fine, thanks.

Acked-by: Michael Ellerman <mpe@...erman.id.au>

cheers

> diff --git a/arch/powerpc/include/asm/ptrace.h b/arch/powerpc/include/asm/ptrace.h
> index 64271e562fed..5d30944f1f6b 100644
> --- a/arch/powerpc/include/asm/ptrace.h
> +++ b/arch/powerpc/include/asm/ptrace.h
> @@ -108,18 +108,33 @@ struct pt_regs
>  
>  #ifndef __ASSEMBLY__
>  
> -#define GET_IP(regs)		((regs)->nip)
> -#define GET_USP(regs)		((regs)->gpr[1])
> -#define GET_FP(regs)		(0)
> -#define SET_FP(regs, val)
> +static inline unsigned long instruction_pointer(struct pt_regs *regs)
> +{
> +	return regs->nip;
> +}
> +
> +static inline void instruction_pointer_set(struct pt_regs *regs,
> +		unsigned long val)
> +{
> +	regs->nip = val;
> +}
> +
> +static inline unsigned long user_stack_pointer(struct pt_regs *regs)
> +{
> +	return regs->gpr[1];
> +}
> +
> +static inline unsigned long frame_pointer(struct pt_regs *regs)
> +{
> +	return 0;
> +}
>  
>  #ifdef CONFIG_SMP
>  extern unsigned long profile_pc(struct pt_regs *regs);
> -#define profile_pc profile_pc
> +#else
> +#define profile_pc(regs) instruction_pointer(regs)
>  #endif
>  
> -#include <asm-generic/ptrace.h>
> -
>  #define kernel_stack_pointer(regs) ((regs)->gpr[1])
>  static inline int is_syscall_success(struct pt_regs *regs)
>  {
> -- 
> 2.20.1