From: Mark Rutland <mark.rutland@arm.com>
To: Ren Zhijie <renzhijie2@huawei.com>
Cc: catalin.marinas@arm.com, will@kernel.org, yusongping@huawei.com,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] arm64: armv8_deprecated: fix unused-function error
Date: Tue, 22 Nov 2022 16:48:52 +0000 [thread overview]
Message-ID: <Y3z9dEkMdCeWAWq0@FVFF77S0Q05N.cambridge.arm.com> (raw)
In-Reply-To: <20221122032010.202956-1-renzhijie2@huawei.com>
On Tue, Nov 22, 2022 at 03:20:10AM +0000, Ren Zhijie wrote:
> If CONFIG_SWP_EMULATION is not set and
> CONFIG_CP15_BARRIER_EMULATION is not set,
> aarch64-linux-gnu complained about unused-function :
>
> arch/arm64/kernel/armv8_deprecated.c:67:21: error: ‘aarch32_check_condition’ defined but not used [-Werror=unused-function]
> static unsigned int aarch32_check_condition(u32 opcode, u32 psr)
> ^~~~~~~~~~~~~~~~~~~~~~~
> cc1: all warnings being treated as errors
>
> To fix this error, warp the definition of
> aarch32_check_condition() by defined(CONFIG_SWP_EMULATION) ||
> defined(CONFIG_CP15_BARRIER_EMULATION)
>
> Fixes: 0c5f416219da ("arm64: armv8_deprecated: move aarch32 helper earlier")
This also depends on building with additional options to turn warnings into
errors, no?
> Signed-off-by: Ren Zhijie <renzhijie2@huawei.com>
> ---
> arch/arm64/kernel/armv8_deprecated.c | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/arch/arm64/kernel/armv8_deprecated.c b/arch/arm64/kernel/armv8_deprecated.c
> index ed0788cf6bbb..3f29ceb6653a 100644
> --- a/arch/arm64/kernel/armv8_deprecated.c
> +++ b/arch/arm64/kernel/armv8_deprecated.c
> @@ -64,6 +64,7 @@ struct insn_emulation {
>
> #define ARM_OPCODE_CONDITION_UNCOND 0xf
>
> +#if defined(CONFIG_SWP_EMULATION) || defined(CONFIG_CP15_BARRIER_EMULATION)
> static unsigned int aarch32_check_condition(u32 opcode, u32 psr)
> {
> u32 cc_bits = opcode >> 28;
> @@ -76,6 +77,7 @@ static unsigned int aarch32_check_condition(u32 opcode, u32 psr)
> }
> return ARM_OPCODE_CONDTEST_UNCOND;
> }
> +#endif
Could we mark this as '__maybe_unused' or 'inline' instead? I think that's
preferable to the ifdeferry.
Thanks,
Mark.
>
> #ifdef CONFIG_SWP_EMULATION
> /*
> --
> 2.17.1
>
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next prev parent reply other threads:[~2022-11-22 16:49 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-11-22 3:20 [PATCH] arm64: armv8_deprecated: fix unused-function error Ren Zhijie
2022-11-22 16:48 ` Mark Rutland [this message]
2022-11-23 2:06 ` Ren Zhijie
2022-11-23 11:01 ` Mark Rutland
2022-11-24 2:17 ` Ren Zhijie
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