Christopher Li <[EMAIL PROTECTED]> writes: > VMware is a big user of the usbdevfs, we translate guest USB > IO to usbdevfs, by submitting URB. On the x86_64 system, we > need those compatible ioctl for submitting URBs. For now we > make a hack to submit it through the vmmon driver. But that > is very ugly. > > I do want this problem get fixed in the linux kernel eventually. > I have been toying with two different ways to solve it. It seems > that it is unavoidable to get hands dirty in the usbdevfs internals. > The first one is just educate the usbdevfs to know about the 32 bit > URB ioctls. So it don't need to keep around a bounce buffer.
Looks reasonable from a first look. Issues: - Should use CONFIG_COMPAT, not x86-64 specific symbols - Why can't you set URB_COMPAT transparently in the emulation layer? Then existing applications would hopefully work without changes, right? You may also want to preserve the __user casts, otherwise Al Viro and other sparse users will be unhappy. Thanks for attacking this long standing problem. -Andi - 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/
