linux-kernel - Re: [alsa-devel] [PATCH] ASoC: SOF: use __u32 instead of uint32

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Message-ID: <fdd24e93-efad-0132-e1ff-b7f5f87e8efc@linux.intel.com>
Date:   Mon, 22 Jul 2019 10:19:53 -0500
From:   Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
To:     Arnd Bergmann <arnd@...db.de>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:     ALSA Development Mailing List <alsa-devel@...a-project.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Takashi Iwai <tiwai@...e.com>,
        Liam Girdwood <liam.r.girdwood@...ux.intel.com>,
        Mark Brown <broonie@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [alsa-devel] [PATCH] ASoC: SOF: use __u32 instead of uint32_t in
 uapi headers



On 7/22/19 8:39 AM, Arnd Bergmann wrote:
> On Sun, Jul 21, 2019 at 4:25 PM Masahiro Yamada
> <yamada.masahiro@...ionext.com> wrote:
>>
>>   struct snd_sof_blk_hdr {
>>          enum snd_sof_fw_blk_type type;
>> -       uint32_t size;          /* bytes minus this header */
>> -       uint32_t offset;        /* offset from base */
>> +       __u32 size;             /* bytes minus this header */
>> +       __u32 offset;           /* offset from base */
>>   } __packed;
>>
> 
> On a related note: Using an 'enum' in an ABI structure is not portable
> across architectures. This is probably fine in a UAPI as long as user
> and kernel space agree on the size of an enum, but if the same
> structure is used to talk to the firmware, it won't work on architectures
> that have a different size for the first field.

yes, we've removed all enums in SOF and missed this one. This should be 
changed, thanks for the note.