Messages in this thread | | | Date | Tue, 08 Sep 2015 18:10:16 -0700 | From | Guenter Roeck <> | Subject | Re: [PATCH 1/3] sysfs: Fix is_visible() support for binary attributes |
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Hi Emilio,
On 09/08/2015 05:51 PM, Emilio López wrote: > Hi Greg & Guenter, > [ ... ] >>>> >>>> Unless I am missing something, this is not explained anywhere, but it is >>>> not entirely trivial to understand. I think it should be documented. > > I agree. I couldn't find any mention of what this int was supposed to be by looking at Documentation/ (is_visible is not even mentioned :/) or include/linux/sysfs.h. Once we settle on something I'll document it before sending a v2. > In the include file ? No strong preference, though.
> By the way, I wrote a quick coccinelle script to match is_visible() users which reference the index (included below), and it found references to drivers which do not seem to use any binary attributes, so I believe changing the index meaning shouldn't be an issue. > Good.
>>> I agree, make i the number of the bin attribute and that should solve >>> this issue. >>> >> No, that would conflict with the "normal" use of is_visible for non-binary >> attributes, and make the index all but useless, since the is_visible function >> would have to search through all the attributes anyway to figure out which one >> is being checked. > > Yeah, using the same indexes would be somewhat pointless, although not many seem to be using it anyway (only 14 files matched). Others seem to be comparing the attr* instead. An alternative would be to use negative indexes for binary attributes and positive indexes for normal attributes. > ... and I probably wrote or reviewed a significant percentage of those ;-).
Using negative numbers for binary attributes is an interesting idea. Kind of unusual, though. Greg, any thoughts on that ?
Guenter
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