Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern AMD64 with MCP51 laptops

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



David Newall wrote:

Exactly. You think it's 2us, but the documentation doesn't say. The _p functions are generic inasmuch as they provide an unspecified delay. Drivers which work across platforms, and which use _p, therefore have different delays on different platforms. Should the length of the delay be unimportant? I wouldn't have thought so. If it is important, does that mean that such drivers are buggy on some platforms?


That the _p delay is different across platforms is actually to be expected, since it pretty much amounts to a platform delay. And yes, if it is used as a specific walltime delay that has nothing to do with the bus architecture of the system then I would classify that as a driver bug.

	-hpa
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

[Index of Archives]     [Kernel Newbies]     [Netfilter]     [Bugtraq]     [Photo]     [Stuff]     [Gimp]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Video 4 Linux]     [Linux for the blind]     [Linux Resources]
  Powered by Linux