Linus Torvalds wrote:
>
>
> On Wed, 11 Apr 2001, Bernd Schmidt wrote:
> See? Do you see why a "memory" clobber is _not_ comparable to a "ax"
> clobber? And why that non-comparability makes a memory clobber equivalent
> to a read-modify-write cycle?
I had to think about this, so I'll explain it
On Wed, 11 Apr 2001, Bernd Schmidt wrote:
> >
> > The example in there compiles out-of-the box and is much easier to
> > experiment on than the whole kernel :-)
>
> That example seems to fail because a "memory" clobber only tells the compiler
> that memory is written, not that it is read.
The a
On Wed, 11 Apr 2001, Andreas Franck wrote:
> Hello David,
>
> > I've been discussing it with some other kernel and GCC people, and they
> > think
> > that only "memory" is required.
>
> Hmm.. I just looked at my GCC problem report from December, perhaps you're
> interested, too:
>
> http://gcc.gn
Hello David,
> I've been discussing it with some other kernel and GCC people, and they
> think
> that only "memory" is required.
Hmm.. I just looked at my GCC problem report from December, perhaps you're
interested, too:
http://gcc.gnu.org/ml/gcc-bugs/2000-12/msg00554.html
The example in there
I've been discussing it with some other kernel and GCC people, and they think
that only "memory" is required.
> What are the reasons against mentioning sem->count directly as a "=m"
> reference? This makes the whole thing less fragile and no more dependent
> on the memory layout of the structure
Hello David and people,
> I've just consulted with one of the gcc people we have here, and he says
> that
> the '"memory"' constraint should do the trick.
>
> Do I take it that that is actually insufficient?
I don't remember exactly, it's been a while, but I think it was not
sufficient when I c
> I'd like you to look over it. It seems newer GCC's (snapshots and the
> upcoming 3.0) will be more strict when modifying some values through
> assembler-passed pointers - in this case, the passed semaphore structure got
> freed too early, causing massive stack corruption on early bootup.
>
> The
7 matches
Mail list logo
