linux-kernel - Re: [PATCH] coresight: do not use the BIT() macro in the UAPI header

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Message-ID: <20200324095304.GA2444@asgard.redhat.com>
Date:   Tue, 24 Mar 2020 10:53:04 +0100
From:   Eugene Syromiatnikov <esyr@...hat.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-stm32@...md-mailman.stormreply.com,
        Pratik Patel <pratikp@...eaurora.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        Michael Williams <michael.williams@....com>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Chunyan Zhang <zhang.chunyan@...aro.org>,
        "Dmitry V. Levin" <ldv@...linux.org>
Subject: Re: [PATCH] coresight: do not use the BIT() macro in the UAPI header

On Tue, Mar 24, 2020 at 07:28:53AM +0100, Greg Kroah-Hartman wrote:
> On Tue, Mar 24, 2020 at 05:22:13AM +0100, Eugene Syromiatnikov wrote:
> > The BIT() macro definition is not available for the UAPI headers
> > (moreover, it can be defined differently in the user space); replace
> > its usage with the _BITUL() macro that is defined in <linux/const.h>.
> 
> Why is somehow _BITUL() ok to use here instead?

It is provided in an UAPI header (include/uapi/linux/const.h)
and is appropriately prefixed with an underscore to avoid conflicts.

> Just open-code it, I didn't think we could use any BIT()-like macros in
> uapi .h files.
> 
> thanks,
> 
> greg k-h
>