On Thu, Dec 14, 2017 at 11:43 AM, Peter Zijlstra <pet...@infradead.org> wrote: > On Thu, Dec 14, 2017 at 12:27:32PM +0100, Peter Zijlstra wrote: >> From: Thomas Gleixner <t...@linutronix.de> >> >> 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.
