On Sun, Aug 14, 2016 at 03:26:45AM -0700, David Lang wrote: > On Sun, 14 Aug 2016, Tom Yan wrote: > > > On 14 August 2016 at 18:07, Tom Yan <tom.ty89@xxxxxxxxx> wrote: > > > On 14 August 2016 at 18:01, Pavel Machek <pavel@xxxxxx> wrote: > > > > > > > > Since SATA support was merged, certainly since v2.4, and from way > > > > before /dev/disk/by-id existed. > > > > > > I have no idea how "SATA before USB" had been done in the past (if it > > > was ever a thing in the kernel), but that has not been the case since > > > at least v3.0 AFAIR. > > > > > > > > > > > People may not run udev, and you can't use /dev/disk/by-id on kernel > > > > command line. > > > > > > > > > > No, but you can always use root=PARTUUID=, that's built into the > > > kernel. (root=UUID= requires udev or so though). > > > > Silly me. root=UUID= has nothing to do with udev, but `blkid` in > > util-linux. At least that's how it's done in Arch/mkinitcpio. > > > > The rule is "don't break working systems", not "but we are allowed to break > systems, see it says here not to depend on this" > > Drive ordering has been stable since the 0.1 kernel [1] Drive probing order of USB has always been non-deterministic, so while I agree that it is not good to break existing systems at all, perhaps this is on the edge of what works vs. doesn't work? I know my USB drives always seem to come up in random order, which is why tools like udev were invented :) > It takes a lot longer to detect USB drives, why in the world would they be > detected before hard-wired drives? Depends, some hard-wired drives take much longer to find than USB ones. That being said, it would be great if the original reporter could use 'git bisect' and let the linux-usb and linux-scsi mailing list know what the offending patch is, and we can take it from there. thanks, greg k-h -- To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
