Am 19.05.2010 09:29, schrieb Christoph Hellwig: > On Tue, May 18, 2010 at 03:22:36PM +0200, Kevin Wolf wrote: >> I think it's stuck here in an endless loop: >> >> while (laiocb->ret == -EINPROGRESS) >> qemu_laio_completion_cb(laiocb->ctx); >> >> Can you verify this by single-stepping one or two loop iterations? ret >> and errno after the read call could be interesting, too. > > Maybe the compiler is just too smart. Without some form of barrier > it could just optimize the loop away as laiocb->ret couldn't change > in a normal single-threaded environment.
It probably could in theory, but in practice we're in a read() inside qemu_laio_completion, so it didn't do it here. Kevin
