linux-kernel - Re: [Qemu-devel] [PATCH] fw_cfg: use __ATTR_RO

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Message-ID: <20190227142903.cvqrc453tgcme77f@master>
Date:   Wed, 27 Feb 2019 14:29:03 +0000
From:   Wei Yang <richard.weiyang@...il.com>
To:     "Michael S. Tsirkin" <mst@...hat.com>
Cc:     Wei Yang <richardw.yang@...ux.intel.com>, somlo@....edu,
        Philippe Mathieu-Daudé <philmd@...hat.com>,
        qemu-devel@...gnu.org, linux-kernel@...r.kernel.org
Subject: Re: [Qemu-devel] [PATCH] fw_cfg: use __ATTR_RO_MODE to define rev
 sysfs

On Wed, Feb 27, 2019 at 08:54:58AM -0500, Michael S. Tsirkin wrote:
>On Wed, Feb 27, 2019 at 11:07:16AM +0800, Wei Yang wrote:
>> On Tue, Feb 26, 2019 at 07:45:46PM +0100, Philippe Mathieu-Daudé wrote:
>> >Hi Wei,
>> >
>> >On 2/26/19 8:31 AM, Wei Yang wrote:
>> >> Leverage __ATTR_RO_MODE to define rev sysfs instead of using open code
>> >> to define the attribute.
>> >> 
>> >> Signed-off-by: Wei Yang <richardw.yang@...ux.intel.com>
>> >> ---
>> >>  drivers/firmware/qemu_fw_cfg.c | 13 ++++---------
>> >>  1 file changed, 4 insertions(+), 9 deletions(-)
>> >> 
>> >> diff --git a/drivers/firmware/qemu_fw_cfg.c b/drivers/firmware/qemu_fw_cfg.c
>> >> index 039e0f91dba8..a1293cbd7adb 100644
>> >> --- a/drivers/firmware/qemu_fw_cfg.c
>> >> +++ b/drivers/firmware/qemu_fw_cfg.c
>> >> @@ -296,18 +296,13 @@ static int fw_cfg_do_platform_probe(struct platform_device *pdev)
>> >>  	return 0;
>> >>  }
>> >>  
>> >> -static ssize_t fw_cfg_showrev(struct kobject *k, struct attribute *a, char *buf)
>> >> +static ssize_t fw_cfg_rev_show(struct kobject *k, struct kobj_attribute *a,
>> >> +			       char *buf)
>> >>  {
>> >>  	return sprintf(buf, "%u\n", fw_cfg_rev);
>> >>  }
>> >> -
>> >> -static const struct {
>> >> -	struct attribute attr;
>> >> -	ssize_t (*show)(struct kobject *k, struct attribute *a, char *buf);
>> >> -} fw_cfg_rev_attr = {
>> >> -	.attr = { .name = "rev", .mode = S_IRUSR },
>> >> -	.show = fw_cfg_showrev,
>> >> -};
>> >> +static const struct kobj_attribute fw_cfg_rev_attr =
>> >> +	__ATTR_RO_MODE(fw_cfg_rev, 0400);
>> >
>> >Why not keep S_IRUSR?
>> >
>> 
>> Because scripts/checkpatch.pl suggest not use S_IRUSR :-)
>> 
>> I am not sure about the particular reason.
>
>Oh yea.
>
>http://lkml.kernel.org/r/CA+55aFw5v23T-zvDZp-MmD_EYxF8WbafwwB59934FV7g21uMGQ@mail.gmail.com
>
>maybe mention this in the commit log.
>

Thanks :-)

>> >>  
>> >>  /* fw_cfg_sysfs_entry type */
>> >>  struct fw_cfg_sysfs_entry {
>> >> 
>> 
>> -- 
>> Wei Yang
>> Help you, Help me

-- 
Wei Yang
Help you, Help me