On Thu, May 29, 2014 at 4:47 AM, Dave Hansen <dave.hansen@xxxxxxxxx> wrote: > On 05/23/2014 05:27 AM, DX Cui wrote: >> It looks the new "register_memory() --> ... -> device_add()" path has the >> correct order for sysfs creation and notification udev. >> >> It would be great if you can confirm my analysis. :-) > > Your analysis looks correct to me. Nathan's patch does, indeed look > like a quite acceptable fix. How far back do those sysfs attribute > groups go, btw? I'm not familiar with it. My gut feeling is: this may need non-trivial efforts -- probably several extra patches need to be backported too. BTW, this race condition finally can cause kernel panic when old Linux VMs of kernel versions <3.9.x, like CentOS 6.5, run on Hyper-V, AND memory hot-add and the balloon driver are used: https://bugzilla.redhat.com/show_bug.cgi?id=1102551 (there is a workaround patch for ***CentOS6.5*** in the bug entry) -- DX -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>