summaryrefslogtreecommitdiff
path: root/patches/cpu-hotplug-Document-why-PREEMPT_RT-uses-a-spinlock.patch
Commit message (Collapse)AuthorAgeFilesLines
* [ANNOUNCE] 4.4-rc6-rt1v4.4-rc6-rt1-patchesSebastian Andrzej Siewior2015-12-231-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Please don't continue reading before christmas eve (or morning, depending on your schedule). If you don't celebrate christmas, well go ahead. Dear RT folks! I'm pleased to announce the v4.4-rc6-rt1 patch set. I tested it on my AMD A10, 64bit. Nothing exploded so far, filesystem is still there. I haven't tested it on anything else. Before someone asks: this does not mean it does *not* work on ARM I simply did not try it. If you are brave then download it, install it and have fun. If something breaks, please report it. If your machine starts blinking like a christmas tree while using the patch then *please* send a photo. Changes since v4.1.15-rt17: - rebase to v4.4-rc6 Known issues (inherited from v4.1-RT): - bcache stays disabled - CPU hotplug is not better than before - The netlink_release() OOPS, reported by Clark, is still on the list, but unsolved due to lack of information - Christoph Mathys reported a stall in cgroup locking code while using Linux containers. You can get this release via the git tree at: git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git v4.4-rc6-rt1 The RT patch against 4.4-rc6 can be found here: https://cdn.kernel.org/pub/linux/kernel/projects/rt/4.4/patch-4.4-rc6-rt1.patch.xz The split quilt queue is available at: https://cdn.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rc6-rt1.tar.xz Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
* [ANNOUNCE] 4.1.13-rt14v4.1.13-rt14-patchesSebastian Andrzej Siewior2015-11-181-4/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | Dear RT folks! I'm pleased to announce the v4.1.13-rt14 patch set. Changes since v4.1.12-rt13: none. Known issues: You can get this release via the git tree at: git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt-rebase git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt-queue The RT patch against 4.1.3 can be found here: https://cdn.kernel.org/pub/linux/kernel/projects/rt/4.1/patch-4.1.13-rt14.patch.xz The split quilt queue is available at: https://cdn.kernel.org/pub/linux/kernel/projects/rt/4.1/patches-4.1.13-rt14.tar.xz Sebastian Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
* [ANNOUNCE] 4.1.10-rt10Thomas Gleixner2015-10-171-2/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Dear RT folks! I'm pleased to announce the v4.1.10-rt10 patch set. v4.1.10-rt9 is a non-announced update to incorporate the linux-4.1.y stable tree changes. Changes since v4.1.10-rt9: Ben Hutchings (1): work-simple: Add missing #include <linux/export.h> Grygorii Strashko (1): net/core/cpuhotplug: Drain input_pkt_queue lockless Thomas Gleixner (2): arm64/xen: Make XEN depend on !RT v4.1.10-rt10 Yang Shi (2): arm64: Convert patch_lock to raw lock arm64: Replace read_lock to rcu lock in call_break_hook Known issues: - bcache stays disabled - CPU hotplug is not better than before - The netlink_release() OOPS, reported by Clark, is still on the list, but unsolved due to lack of information The delta patch against 4.1.10-rt10 is appended below and can be found here: https://cdn.kernel.org/pub/linux/kernel/projects/rt/4.1/incr/patch-4.1.10-rt9-rt10.patch.xz You can get this release via the git tree at: git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git v4.1.10-rt10 The RT patch against 4.1.10 can be found here: https://cdn.kernel.org/pub/linux/kernel/projects/rt/4.1/patch-4.1.10-rt10.patch.xz The split quilt queue is available at: https://cdn.kernel.org/pub/linux/kernel/projects/rt/4.1/patches-4.1.10-rt10.tar.xz Enjoy! tglx Signed-off-by: Thomas Gleixner <tglx@linutronix.de> diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index 2cc65a6f4bbd..09a41259b984 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -601,7 +601,7 @@ config XEN_DOM0 config XEN bool "Xen guest support on ARM64" - depends on ARM64 && OF + depends on ARM64 && OF && !PREEMPT_RT_FULL select SWIOTLB_XEN help Say Y if you want to run Linux in a Virtual Machine on Xen on ARM64. diff --git a/arch/arm64/kernel/debug-monitors.c b/arch/arm64/kernel/debug-monitors.c index b056369fd47d..70654d843d9b 100644 --- a/arch/arm64/kernel/debug-monitors.c +++ b/arch/arm64/kernel/debug-monitors.c @@ -271,20 +271,21 @@ static int single_step_handler(unsigned long addr, unsigned int esr, * Use reader/writer locks instead of plain spinlock. */ static LIST_HEAD(break_hook); -static DEFINE_RWLOCK(break_hook_lock); +static DEFINE_SPINLOCK(break_hook_lock); void register_break_hook(struct break_hook *hook) { - write_lock(&break_hook_lock); - list_add(&hook->node, &break_hook); - write_unlock(&break_hook_lock); + spin_lock(&break_hook_lock); + list_add_rcu(&hook->node, &break_hook); + spin_unlock(&break_hook_lock); } void unregister_break_hook(struct break_hook *hook) { - write_lock(&break_hook_lock); - list_del(&hook->node); - write_unlock(&break_hook_lock); + spin_lock(&break_hook_lock); + list_del_rcu(&hook->node); + spin_unlock(&break_hook_lock); + synchronize_rcu(); } static int call_break_hook(struct pt_regs *regs, unsigned int esr) @@ -292,11 +293,11 @@ static int call_break_hook(struct pt_regs *regs, unsigned int esr) struct break_hook *hook; int (*fn)(struct pt_regs *regs, unsigned int esr) = NULL; - read_lock(&break_hook_lock); - list_for_each_entry(hook, &break_hook, node) + rcu_read_lock(); + list_for_each_entry_rcu(hook, &break_hook, node) if ((esr & hook->esr_mask) == hook->esr_val) fn = hook->fn; - read_unlock(&break_hook_lock); + rcu_read_unlock(); return fn ? fn(regs, esr) : DBG_HOOK_ERROR; } diff --git a/arch/arm64/kernel/insn.c b/arch/arm64/kernel/insn.c index 924902083e47..30eb88e5b896 100644 --- a/arch/arm64/kernel/insn.c +++ b/arch/arm64/kernel/insn.c @@ -77,7 +77,7 @@ bool __kprobes aarch64_insn_is_nop(u32 insn) } } -static DEFINE_SPINLOCK(patch_lock); +static DEFINE_RAW_SPINLOCK(patch_lock); static void __kprobes *patch_map(void *addr, int fixmap) { @@ -124,13 +124,13 @@ static int __kprobes __aarch64_insn_write(void *addr, u32 insn) unsigned long flags = 0; int ret; - spin_lock_irqsave(&patch_lock, flags); + raw_spin_lock_irqsave(&patch_lock, flags); waddr = patch_map(addr, FIX_TEXT_POKE0); ret = probe_kernel_write(waddr, &insn, AARCH64_INSN_SIZE); patch_unmap(FIX_TEXT_POKE0); - spin_unlock_irqrestore(&patch_lock, flags); + raw_spin_unlock_irqrestore(&patch_lock, flags); return ret; } diff --git a/kernel/sched/work-simple.c b/kernel/sched/work-simple.c index c996f755dba6..e57a0522573f 100644 --- a/kernel/sched/work-simple.c +++ b/kernel/sched/work-simple.c @@ -10,6 +10,7 @@ #include <linux/kthread.h> #include <linux/slab.h> #include <linux/spinlock.h> +#include <linux/export.h> #define SWORK_EVENT_PENDING (1 << 0) diff --git a/localversion-rt b/localversion-rt index 22746d6390a4..d79dde624aaa 100644 --- a/localversion-rt +++ b/localversion-rt @@ -1 +1 @@ --rt9 +-rt10 diff --git a/net/core/dev.c b/net/core/dev.c index 4969c0d3dd67..f8c23dee5ae9 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -7217,7 +7217,7 @@ static int dev_cpu_callback(struct notifier_block *nfb, netif_rx_ni(skb); input_queue_head_incr(oldsd); } - while ((skb = skb_dequeue(&oldsd->input_pkt_queue))) { + while ((skb = __skb_dequeue(&oldsd->input_pkt_queue))) { netif_rx_ni(skb); input_queue_head_incr(oldsd); }
* [ANNOUNCE] 4.1.2-rt1v4.1.2-rt1-patchesSebastian Andrzej Siewior2015-01-011-0/+55
Dear RT folks! I'm pleased to announce the v4.1.2-rt1 patch set. The move from 4.0 to 4.1 was rather smooth, so we took the time for some overdue cleanups and restructuring of the patch queue. 1) Patch folding - Fold all fixlets into the proper patches - Consolidate the patches which change the same piece of code over and over (e.g. add/revert/redo). These patches were mostly kept to be easily picked up for stable. 2) Dropping obsolete patches Some patches have been superseeded by different upstream changes, so the RT variant is redundant. 3) Changelogs Quite some patches had no or useless changelogs. We updated them all. Each patch has now a From+Subject+Date field. That means "git quiltimport" will produce now the same commit id for each patch (as long as the commit author and date remain unchanged). 4) Reordering The patches got reordered in topics, so patches related to the same subsystem or problem space are grouped together. 5) Ability to build and boot Each step in the queue now builds with RT=n and RT=y. All steps boot with RT=n. With RT=y the functionality is obviously dependent on all patches, so a boot bisectability can not be achieved. As of now we provide a git tree with the RT changes as well. The tree is similar structured as Stevens stable RT tree. For each kernel version we provide 3 branches: linux-m.n.y-rt This branch starts when we move to a new kernel version. After the first release this branch gets only incremental updates (either from the mainline stable tree or from updates to the rt patch queue) linux-m.n.y-rt-rebase This branch is rebased when a new stable version or a new RT patch queue is available. The RT patch queue is applied on top of the latest mainline stable version. linux-m.n.y-queue This branch contains the revisions of the rt patch queue - patches and series file. Known issues: - My AMD box throws a lot of "cpufreq_stat_notifier_trans: No policy found" warnings after boot. It is gone after manually setting the policy (to something else than reported). - bcache is disabled. - CPU hotplug works in general. Steven's test script however deadlocks usually on the second invocation. - xor / raid_pq I had max latency jumping up to 67563us on one CPU while the next lower max was 58us. I tracked it down to module's init code of xor and raid_pq. Both disable preemption while measuring the performance of the individual implementation. The git URLs for this release are git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt-rebase git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt-queue The RT patch against 4.1.2 can be found here: https://www.kernel.org/pub/linux/kernel/projects/rt/4.1/patch-4.1.2-rt1.patch.xz The split quilt queue is available at: https://www.kernel.org/pub/linux/kernel/projects/rt/4.1/patches-4.1.2-rt1.tar.xz Sebastian Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
View Lorry Controller Status