linux-kernel - Re: [PATCH 4/8] arm64: insn: Add helpers for adrp offsets

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Message-ID: <57B5CA91.1070206@arm.com>
Date:	Thu, 18 Aug 2016 15:47:45 +0100
From:	Marc Zyngier <marc.zyngier@....com>
To:	Suzuki K Poulose <suzuki.poulose@....com>,
	linux-arm-kernel@...ts.infradead.org
Cc:	mark.rutland@....com, catalin.marinas@....com, will.deacon@....com,
	linux-kernel@...r.kernel.org, andre.przywara@....com
Subject: Re: [PATCH 4/8] arm64: insn: Add helpers for adrp offsets

Hi Suzuki,

On 18/08/16 14:10, Suzuki K Poulose wrote:
> Adds helpers for decoding/encoding the PC relative addresses for adrp.
> This will be used for handling dynamic patching of 'adrp' instructions
> in alternative code patching.
> 
> Cc: Mark Rutland <mark.rutland@....com>
> Cc: Will Deacon <will.deacon@....com>
> Cc: Catalin Marinas <catalin.marinas@....com>
> Signed-off-by: Suzuki K Poulose <suzuki.poulose@....com>
> ---
>  arch/arm64/include/asm/insn.h |  4 ++++
>  arch/arm64/kernel/insn.c      | 13 +++++++++++++
>  2 files changed, 17 insertions(+)
> 
> diff --git a/arch/arm64/include/asm/insn.h b/arch/arm64/include/asm/insn.h
> index 1dbaa90..dffb0364 100644
> --- a/arch/arm64/include/asm/insn.h
> +++ b/arch/arm64/include/asm/insn.h
> @@ -247,6 +247,7 @@ static __always_inline u32 aarch64_insn_get_##abbr##_value(void) \
>  { return (val); }
>  
>  __AARCH64_INSN_FUNCS(adr_adrp,	0x1F000000, 0x10000000)
> +__AARCH64_INSN_FUNCS(adrp,	0x9F000000, 0x90000000)

I'm a bit bothered by this one. We end-up with both
aarch64_insn_is_adr_adrp() *and* aarch64_insn_is_adrp() (and their
respective getters).

How about dropping adr_adrp, and explicitly having adr and adrp? There
is only two users in the tree, so that should be easy to address.

Thanks,

	M.
-- 
Jazz is not dead. It just smells funny...