linux-kernel - Re: [PATCH] firmware_loader: change enum fw

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Message-ID: <d87aabd0-1195-64ae-d871-b0771be832a8@broadcom.com>
Date:   Fri, 22 May 2020 15:49:05 -0700
From:   Scott Branden <scott.branden@...adcom.com>
To:     Luis Chamberlain <mcgrof@...nel.org>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        David Brown <david.brown@...aro.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Shuah Khan <shuah@...nel.org>, bjorn.andersson@...aro.org,
        Shuah Khan <skhan@...uxfoundation.org>,
        Arnd Bergmann <arnd@...db.de>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-fsdevel@...r.kernel.org,
        BCM Kernel Feedback <bcm-kernel-feedback-list@...adcom.com>,
        Olof Johansson <olof@...om.net>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        Colin Ian King <colin.king@...onical.com>,
        Kees Cook <keescook@...omium.org>,
        Takashi Iwai <tiwai@...e.de>, linux-kselftest@...r.kernel.org,
        Andy Gross <agross@...nel.org>
Subject: Re: [PATCH] firmware_loader: change enum fw_opt to u32

Hi Luis,

On 2020-05-22 3:45 p.m., Luis Chamberlain wrote:
> On Fri, May 22, 2020 at 02:46:58PM -0700, Scott Branden wrote:
>>   
>>   /**
>> - * enum fw_opt - options to control firmware loading behaviour
>> + * fw_opt - options to control firmware loading behaviour
>>    *
>>    * @FW_OPT_UEVENT: Enables the fallback mechanism to send a kobject uevent
>>    *	when the firmware is not found. Userspace is in charge to load the
>> @@ -33,15 +33,13 @@
>>    *	the platform's main firmware. If both this fallback and the sysfs
>>    *      fallback are enabled, then this fallback will be tried first.
>>    */
>> -enum fw_opt {
>> -	FW_OPT_UEVENT			= BIT(0),
>> -	FW_OPT_NOWAIT			= BIT(1),
>> -	FW_OPT_USERHELPER		= BIT(2),
>> -	FW_OPT_NO_WARN			= BIT(3),
>> -	FW_OPT_NOCACHE			= BIT(4),
>> -	FW_OPT_NOFALLBACK_SYSFS		= BIT(5),
>> -	FW_OPT_FALLBACK_PLATFORM	= BIT(6),
>> -};
>> +#define FW_OPT_UEVENT			BIT(0)
>> +#define FW_OPT_NOWAIT			BIT(1)
>> +#define FW_OPT_USERHELPER		BIT(2)
>> +#define FW_OPT_NO_WARN			BIT(3)
>> +#define FW_OPT_NOCACHE			BIT(4)
>> +#define FW_OPT_NOFALLBACK_SYSFS		BIT(5)
>> +#define FW_OPT_FALLBACK_PLATFORM	BIT(6)
> Everything looked good up to here. The enum defines each flag.
> We just want to use an enum for *one* flag represetnation, not
> a bundle.
I do not know exactly what you are looking for then.  The FW_OPT_* 
values are OR'd
together in the code.  You still want the fw_opt enum above left in 
place entirely
and then the values used in OR'd together?

>    Luis