On Wed, 25 Apr 2018, David Rientjes wrote:
> On Wed, 25 Apr 2018, Mikulas Patocka wrote: > > > You need to enable it on boot. Enabling it when the kernel starts to > > execute userspace code is already too late (because you would miss > > kvmalloc calls in the kernel boot path). > > Is your motivation that since kvmalloc() never falls back to vmalloc() on > boot because fragmentation is not be an issue at boot that we should catch > bugs where it would matter if it had fallen back? If we are worrying > about falling back to vmalloc before even initscripts have run I think we > have bigger problems. The same driver can be compiled directly into the kernel or be loaded as a module. If the user (or the person preparing distro kernel) compiles the driver directly into the kernel, kvmalloc should be tested on that driver, because a different user or distribution can compile that driver as a module. Mikulas
