On Thu, Dec 14, 2017 at 11:43 AM, Peter Zijlstra <peterz@xxxxxxxxxxxxx> wrote: > On Thu, Dec 14, 2017 at 12:27:32PM +0100, Peter Zijlstra wrote: >> From: Thomas Gleixner <tglx@xxxxxxxxxxxxx> >> >> Kernel threads can use the mm of a user process temporarily via use_mm(), >> but there is no point in installing the LDT which is associated to that mm >> for the kernel thread. > > So thinking about this a bit more; I fear its not correct. > > Suppose a kthread does use_mm() and we then schedule to a task of that > process, we'll not pass through switch_mm() and we'll not install the > LDT and bad things happen. > > Or am I missing something? > Nah, you're probably right. -- 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>
