On Wed, Oct 24, 2018 at 09:57:00AM +0100, Russell King - ARM Linux wrote:

On Wed, Oct 24, 2018 at 07:35:46AM +0000, Corentin Labbe wrote:

quoted

This patchset adds a new set of functions which are open-coded in lot of
place.
Basicly the pattern is always the same, "read, modify a bit, write"
some driver and the powerpc arch already have thoses pattern them as functions. (like ahci_sunxi.c or dwmac-meson8b)

The advantage of them being open-coded is that it's _obvious_ to the
reviewer that there is a read-modify-write going on which, in a multi-
threaded environment, may need some locking (so it should trigger a
review of the locking around that code.)

With it hidden inside a helper which has no locking itself, it becomes
much easier to pass over in review, which means that races are much
more likely to go unspotted - and that is bad news.

Hello

I understand your fear, but I think the benefit overhaul thoses.
Furthermore, drivers which I have converted does not need such locking.

If you want I can rename the header to linux/setbits-non-atomic.h for making obvious the lack of locking.

Regards