linux-kernel - Re: [PATCH 2/2] uprobes/powerpc: Kill arch

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Date:	Mon, 11 Nov 2013 16:29:25 +0530
From:	Ananth N Mavinakayanahalli <ananth@...ibm.com>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] uprobes/powerpc: Kill arch_uprobe->ainsn

On Sat, Nov 09, 2013 at 06:54:09PM +0100, Oleg Nesterov wrote:
> powerpc has both arch_uprobe->insn and arch_uprobe->ainsn to
> make the generic code happy. This is no longer needed after
> the previous change, powerpc can just use "u32 insn".
> 
> Signed-off-by: Oleg Nesterov <oleg@...hat.com>
> ---
>  arch/powerpc/include/asm/uprobes.h |    5 ++---
>  arch/powerpc/kernel/uprobes.c      |    2 +-
>  2 files changed, 3 insertions(+), 4 deletions(-)
> 
> diff --git a/arch/powerpc/include/asm/uprobes.h b/arch/powerpc/include/asm/uprobes.h
> index 75c6ecd..7422a99 100644
> --- a/arch/powerpc/include/asm/uprobes.h
> +++ b/arch/powerpc/include/asm/uprobes.h
> @@ -36,9 +36,8 @@ typedef ppc_opcode_t uprobe_opcode_t;
> 
>  struct arch_uprobe {
>  	union {
> -		u8	insn[MAX_UINSN_BYTES];
> -		u8	ixol[MAX_UINSN_BYTES];
> -		u32	ainsn;
> +		u32	insn;
> +		u32	ixol;
>  	};
>  };
> 
> diff --git a/arch/powerpc/kernel/uprobes.c b/arch/powerpc/kernel/uprobes.c
> index 59f419b..003b209 100644
> --- a/arch/powerpc/kernel/uprobes.c
> +++ b/arch/powerpc/kernel/uprobes.c
> @@ -186,7 +186,7 @@ bool arch_uprobe_skip_sstep(struct arch_uprobe *auprobe, struct pt_regs *regs)
>  	 * emulate_step() returns 1 if the insn was successfully emulated.
>  	 * For all other cases, we need to single-step in hardware.
>  	 */
> -	ret = emulate_step(regs, auprobe->ainsn);
> +	ret = emulate_step(regs, auprobe->insn);
>  	if (ret > 0)
>  		return true;

Acked-by: Ananth N Mavinakayanahalli <ananth@...ibm.com>

Thanks Oleg.

Ananth

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