Re: [-next PATCH 2/4] treewide: Use DEVICE_ATTR_RW

On Wed, 2017-12-20 at 10:34 +0200, Jarkko Nikula wrote:

On Tue, Dec 19, 2017 at 10:15:07AM -0800, Joe Perches wrote:

quoted

Convert DEVICE_ATTR uses to DEVICE_ATTR_RW where possible.

[] 

quoted

diff --git a/sound/soc/omap/mcbsp.c b/sound/soc/omap/mcbsp.c

[]

quoted

@@ -854,7 +854,7 @@ static ssize_t dma_op_mode_store(struct device *dev,
 	return size;
 }
 
-static DEVICE_ATTR(dma_op_mode, 0644, dma_op_mode_show, dma_op_mode_store);
+static DEVICE_ATTR_RW(dma_op_mode);
 

While I can ack this part here if it helps generic cleanup effort I
don't understart would it improve code readability in general? Mode 644
is clear and don't need any grepping but for DEVICE_ATTR_RW() I had to go
through all of these files in order to see what does it mean:

Are you suggesting that device.h (as that is where
DEVICE_ATTR and the other DEVICE_ATTR_<FOO> variants
are #defined) should have better comments for the
_<FOO> variants?

DEVICE_ATTR_RW: include/linux/device.h
__ATTR_RW: include/linux/sysfs.h
S_IWUSR: include/uapi/linux/stat.h
S_IRUGO: include/linux/stat.h

btw: patch 1/4 of the series does remove the uses of
S_<PERMS> from these macros in sysfs.h and converts
them to simple octal instead.

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