Messages in this thread | ![/](/images/icornerl.gif) | | Date | Sun, 20 Nov 2016 08:09:40 -0800 | From | Davidlohr Bueso <> | Subject | Re: [PATCH] drivers/usb: use READ_ONCE instead of deprecated ACCESS_ONCE |
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Hi Greg!
On Sun, 20 Nov 2016, Greg KH wrote:
>On Sat, Nov 19, 2016 at 11:54:25AM -0800, Davidlohr Bueso wrote: >> With the new standardized functions, we can replace all ACCESS_ONCE() >> calls across relevant drivers/usb/. >> >> ACCESS_ONCE() does not work reliably on non-scalar types. For example >> gcc 4.6 and 4.7 might remove the volatile tag for such accesses during >> the SRA (scalar replacement of aggregates) step: >> >> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58145 >> >> Update the new calls regardless of if it is a scalar type, this is >> cleaner than having three alternatives. >> >> Signed-off-by: Davidlohr Bueso <dbueso@suse.de> > >Nit, this doesn't match your From: line :(
That's on purpose, and all my patches are the same.
>If this is the case, why not just replacing the define for ACCESS_ONCE() >with READ_ONCE() and then go back and just do a search/replace for the >whole kernel all at once?
So that we don't have three variants; the idea is to eventually get rid of ACCESS_ONCE entirely.
> >Or just send Linus a patch for this all at once after -rc1 is out?
No rush, whenever you see fit.
Thanks, Davidlohr
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