On Sat, 3 Jan 2009, Pavel Machek wrote:
On Sat 2009-01-03 20:30:44, Alan Cox wrote:
If it is okay and linux relies on it, it should be documented.
If it is not okay, I guess we should document it, too -- it seems to
be common mistake.
A lot of old code did it knowing it was under the BKL, outside of the BKL
its a very bad idea. There were lots of them in the tty layer and I don't
doubt there are some left I missed too 8(
I have seen this in new code (some LED driver last time), definitely
no BKL.
Is there concrete architecture where it breaks? I'd expect i386/x86-64
to be safe, and pretty much everyone to be safe as long as that long
is aligned.... or that was the result of arch-maintainers
discussion...
I'd really like to document if it is right or not, so that I can point
people to documentation...
you may want to take a look at the new C/C++/POSIX standards (some just
standardized, some still in development), they explicitly address this
area.
David Lang
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