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Date: Thu, 02 Jul 2015 14:23:48 +0900 From: Krzysztof Kozlowski <k.kozlowski@...sung.com> To: Jisheng Zhang <jszhang@...vell.com>, catalin.marinas@....com, will.deacon@....com, lorenzo.pieralisi@....com Cc: linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org Subject: Re: [PATCH v2] arm64: cpuidle: add __init section marker to arm_cpuidle_init On 02.07.2015 13:58, Jisheng Zhang wrote: > Dear Krzysztof, > > On Thu, 2 Jul 2015 12:59:44 +0900 > Krzysztof Kozlowski <k.kozlowski@...sung.com> wrote: > >> 2015-07-02 11:14 GMT+09:00 Jisheng Zhang <jszhang@...vell.com>: >>> It is not needed after booting, this patch moves the arm_cpuidle_init() >>> function to the __init section. >>> >>> Signed-off-by: Jisheng Zhang <jszhang@...vell.com> >>> --- >>> arch/arm64/include/asm/cpuidle.h | 2 +- >>> arch/arm64/kernel/cpuidle.c | 2 +- >>> 2 files changed, 2 insertions(+), 2 deletions(-) >>> >>> diff --git a/arch/arm64/include/asm/cpuidle.h b/arch/arm64/include/asm/cpuidle.h >>> index 0f74f05..5748d3b 100644 >>> --- a/arch/arm64/include/asm/cpuidle.h >>> +++ b/arch/arm64/include/asm/cpuidle.h >>> @@ -4,7 +4,7 @@ >>> #include <asm/proc-fns.h> >>> >>> #ifdef CONFIG_CPU_IDLE >>> -extern int arm_cpuidle_init(unsigned int cpu); >>> +extern int __init arm_cpuidle_init(unsigned int cpu); >> >> No, not here but... >> >>> extern int arm_cpuidle_suspend(int index); >>> #else >>> static inline int arm_cpuidle_init(unsigned int cpu) >> >> ... here so the stub for !CONFIG_CPU_IDLE would be marked as well. > > when !CONFIG_CPU_IDLE, arm_cpuidle_init() is inlined, and just return -EOPNOTSUPP; > Per my understanding, it will be optimized out by compiler. I'm not sure whether > there is any benefit to mark inlined function as __init. But Per my check, all > other inlined functions in linux kernel have no __init. What do you think? Yes, you're right, the inline is sufficient so this means that actually the first patch was correct. The __init is not needed in extern declaration. For both versions then: Reviewed-by: Krzysztof Kozlowski <k.kozlowski@...sung.com> Best regards, Krzysztof -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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