linux-kernel - Re: [PATCH -next] arm64: Export __cpu_logical

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Message-ID: <bd2e3029-f561-8aab-6772-1be91d457f9d@arm.com>
Date:   Fri, 24 Jul 2020 16:06:28 +0530
From:   Anshuman Khandual <anshuman.khandual@....com>
To:     Catalin Marinas <catalin.marinas@....com>
Cc:     Kefeng Wang <wangkefeng.wang@...wei.com>,
        Will Deacon <will@...nel.org>,
        Mikko Perttunen <mperttunen@...dia.com>,
        Sumit Gupta <sumitg@...dia.com>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Hulk Robot <hulkci@...wei.com>,
        "linux-kernel@...r.kernel.org List" <linux-kernel@...r.kernel.org>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH -next] arm64: Export __cpu_logical_map



On 07/24/2020 03:00 PM, Catalin Marinas wrote:
> On Fri, Jul 24, 2020 at 01:46:18PM +0530, Anshuman Khandual wrote:
>> On 07/24/2020 08:38 AM, Kefeng Wang wrote:
>>> On 2020/7/24 11:04, Kefeng Wang wrote:
>>>> ERROR: modpost: "__cpu_logical_map" [drivers/cpufreq/tegra194-cpufreq.ko] undefined!
>>>>
>>>> ARM64 tegra194-cpufreq driver use cpu_logical_map, export
>>>> __cpu_logical_map to fix build issue.
>> Commit 887d5fc82cb4 ("cpufreq: Add Tegra194 cpufreq driver") which adds
>> this particular driver is present just on linux-next. But as expected,
>> the driver does not use __cpu_logical_map directly but instead accesses
>> it via cpu_logical_map() wrapper. Wondering, how did you even trigger
>> the modpost error ?
> Since the wrapper is a macro, it just expands to __cpu_logical_map[].
> 

Ahh, right. Existing cpu_logical_map() is not a true wrapper and it
makes sense to convert that into one.