On Tue, 2012-10-09 at 15:46 +0200, Thomas Gleixner wrote: > Dear RT Folks, > > I'm pleased to announce the 3.6.1-rt1 release. > > This is a pretty straight forward move from the 3.4-rt series which > includes a few significant updates which need to be backported to the > 3.x-rt stable series: My scripts detected these patches to be pulled into stable. It detects any patch that has a Cc: to stable-rt@xxxxxxxxxxxxxxx that does not already exist in stable. It also adds the '000x-' prefix to keep the order. 0000-scsi-qla2xxx-fix-bug-sleeping-function-called-from-invalid-context.patch 0001-upstream-net-rt-remove-preemption-disabling-in-netif_rx.patch 0002-random-make-it-work-on-rt.patch 0003-softirq-init-softirq-local-lock-after-per-cpu-section-is-set-up.patch 0004-mm-slab-fix-potential-deadlock.patch 0005-mm-page-alloc-use-local-lock-on-target-cpu.patch 0006-rt-rw-lockdep-annotations.patch 0007-stomp-machine-deal-clever-with-stopper-lock.patch > > * Make interrupt randomness work again on RT. Based on the 3.x.y > stable updates in that area. Should be applicable to all 3.x-rt > series with almost no modifications. Looks to be: random-make-it-work-on-rt.patch > > * RT softirq initialization sequence fix (Steven Rostedt) As I remembered that I forgot to Cc stable-rt, I manually added it to my patch before running the script. > > * Fix for a potential deadlock in mm/slab.c. This had been reported > as lockdep splats several times and stupidly ignored as a false > positive, but in fact it's a real (though almost impossible to > trigger) deadlock lurking. Looks to be: mm-slab-fix-potential-deadlock.patch > > * Use the proper local_lock primitives in mm/page_alloc.c. That's > not a real bug, but this fixes an inconsistency which helps > debugability and therefore is worthwhile to be backported. Looks to be: mm-page-alloc-use-local-lock-on-target-cpu.patch > > * RT-rwlock/rwsem annotations: Looks to be: rt-rw-lockdep-annotations.patch > > RT does not allow multiple readers on rwlocks and rwsems. The > lockdep annotations did not yet consider that fact. One might > think that this is a complete RT specific issue, but it's > not. The FIFO fair rwsem/lock modifications in mainline made > reader/writer primitives prone to very subtle deadlock problems > which cannot be detected by the current lockdep annotations in > mainline. The reason is that if a writer interleaves with two > readers it will block the second reader from proceeding in order > not to allow writer starvation. The restricted RWlocks semantics > of RT allow an easy detection of that problem. We already > triggered a real deadlock in RT (see: > peterz-srcu-crypto-chain.patch) which could result in a hard to > trigger, but mainline relevant deadlock. Wait for more > interesting problems in that area. > > * The output of might_sleep debugging is silent about the possible > causes vs. the preempt count. Contrary to interrupt disabling > there is zero information about what disabled preemption > last. Again, not strictly a bugfix, but debuggability is key. Is this: sched-better-debug-output-for-might-sleep.patch ? It's not marked to Cc stable-rt. > > * Fix a potentially deadly sto(m)p_machine deadlock. A CPU which > calls that code from its inactive state (don't ask me for the > ghastly deatils why this is necessary) can run into a contended > state of the stomp machine mutex which would cause a rather > awkward issue of idle scheduling itself away to idle as the only > possible task on that upcoming cpu. Not pretty .... Looks to be: stomp-machine-deal-clever-with-stopper-lock.patch If I'm wrong with the above, let me know. Thanks, -- Steve -- To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
