On Tue, May 19, 2020 at 04:54:53PM -0400, Steven Rostedt wrote: > On Tue, 19 May 2020 13:45:45 -0700 > Matthew Wilcox <willy@xxxxxxxxxxxxx> wrote: > > > On Tue, May 19, 2020 at 10:19:06PM +0200, Sebastian Andrzej Siewior wrote: > > > The radix-tree and idr preload mechanisms use preempt_disable() to protect > > > the complete operation between xxx_preload() and xxx_preload_end(). > > > > > > As the code inside the preempt disabled section acquires regular spinlocks, > > > which are converted to 'sleeping' spinlocks on a PREEMPT_RT kernel and > > > eventually calls into a memory allocator, this conflicts with the RT > > > semantics. > > > > > > Convert it to a local_lock which allows RT kernels to substitute them with > > > a real per CPU lock. On non RT kernels this maps to preempt_disable() as > > > before, but provides also lockdep coverage of the critical region. > > > No functional change. > > > > I don't seem to have a locallock.h in my tree. Where can I find more > > information about it? > > PATCH 1 ;-) ... this is why we have the convention to cc everybody on all the patches. > https://lore.kernel.org/r/20200519201912.1564477-1-bigeasy@xxxxxxxxxxxxx > > With lore and b4, it should now be easy to get full patch series. Thats asking too much of the random people cc'd on random patches. What is b4 anyway?
