linux-kernel - Re: [PATCH v4 2/2] ARM: ftrace: Add MODULE

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Message-ID: <CAKv+Gu8WeV+7U4omoMvECPa0LhF4Nrusvy+V0mirWVfejCebNg@mail.gmail.com>
Date:   Tue, 13 Mar 2018 17:51:02 +0000
From:   Ard Biesheuvel <ard.biesheuvel@...aro.org>
To:     Alexander Sverdlin <alexander.sverdlin@...ia.com>
Cc:     linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Russell King <linux@...linux.org.uk>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...hat.com>
Subject: Re: [PATCH v4 2/2] ARM: ftrace: Add MODULE_PLTS support

On 13 March 2018 at 17:49, Alexander Sverdlin
<alexander.sverdlin@...ia.com> wrote:
> On 13/03/18 18:39, Ard Biesheuvel wrote:
>> if (IS_ENABLED(CONFIG_ARM_MODULE_PLTS))
>>     module_plt_alloc_fixed();
>
> Do you consider this a legal C code if without module-plts.o the function would not exist at all?
> That's too much relying on optimizer I think...
>

Yes, we rely on that in many different places in the kernel.