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| author | Sebastian Andrzej Siewior <bigeasy@linutronix.de> | 2019-03-20 17:46:47 +0100 |
|---|---|---|
| committer | Sebastian Andrzej Siewior <bigeasy@linutronix.de> | 2019-03-20 17:46:47 +0100 |
| commit | 950cb9324997cc28399d95f9075e07a64b5fa51e (patch) | |
| tree | bf91a74a81449428eefa3f6ead1523d1a48f7d0c /patches/preempt-nort-rt-variants.patch | |
| parent | 24229c13fab84b7694bb6af818737bd37f80814a (diff) | |
| download | linux-rt-950cb9324997cc28399d95f9075e07a64b5fa51e.tar.gz | |
[ANNOUNCE] v5.0.3-rt1v5.0.3-rt1-patches
Dear RT folks!
I'm pleased to announce the v5.0.3-rt1 patch set.
Changes since v4.19.25-rt16:
- rebase to v5.0
- Several ARM architectures have a so called "boot_lock" in their SMP
bring up code. In previous releases the boot_lock was converted to
to a raw_spinlock in order to get in working on -RT. As of v5.0 only the
bits for the `versatile' platform have been applied upstream and I
dropped the patch entirely.
The other platforms were rejected because they were doing it wrong by
using such a lock. The omap2 and sti platform were converted to other
mechanism as part of the discussion. Others (like i.MX) were never
using such a lock.
There are still a few platforms using such a lock. If you are
affected you would to convince the platform maintainer to remove the
lock from the SMP code.
- Applied John Ogness' prinkt rework. One visible change is the
output during boot. Under the hood and for RT: By default, output
that is created at KERN_WARN[0] or higher is printed immediately if the
console supports "atomic" print (currently the 8250 driver does).
This output is printed immediately (and visible) even from IRQ-off
or preempt-disabled regions which wasn't the case earlier. This will
raise the latency at run-time *but* there should be no WARNING,
ERROR or PANIC messages at run-time on a fully working system.
Messages with lower severity are printed "later" by a kthread.
[0] default message level, default_message_loglevel, second field in
/proc/sys/kernel/printk
- Applied "restore FPU on return to userland" series. This only
applies to x86. This change makes repeated kernel_fpu_begin() +
kernel_fpu_end() cheap.
- I tried to include some BH related rework but it is not yet in
reasonable shape. I will probably revisit this during the v5.0
cycle.
Known issues
- A warning triggered in "rcu_note_context_switch" originated from
SyS_timer_gettime(). The issue was always there, it is now
visible. Reported by Grygorii Strashko and Daniel Wagner.
- rcutorture is currently broken on -RT. Reported by Juri Lelli.
You can get this release via the git tree at:
git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git v5.0.3-rt1
The RT patch against v5.0.3 can be found here:
https://cdn.kernel.org/pub/linux/kernel/projects/rt/5.0/older/patch-5.0.3-rt1.patch.xz
The split quilt queue is available at:
https://cdn.kernel.org/pub/linux/kernel/projects/rt/5.0/older/patches-5.0.3-rt1.tar.xz
Sebastian
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Diffstat (limited to 'patches/preempt-nort-rt-variants.patch')
| -rw-r--r-- | patches/preempt-nort-rt-variants.patch | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/patches/preempt-nort-rt-variants.patch b/patches/preempt-nort-rt-variants.patch index c9a87c546ee3..8396aef42005 100644 --- a/patches/preempt-nort-rt-variants.patch +++ b/patches/preempt-nort-rt-variants.patch @@ -13,7 +13,7 @@ Signed-off-by: Thomas Gleixner <tglx@linutronix.de> --- a/include/linux/preempt.h +++ b/include/linux/preempt.h -@@ -181,7 +181,11 @@ do { \ +@@ -178,7 +178,11 @@ do { \ preempt_count_dec(); \ } while (0) @@ -26,7 +26,7 @@ Signed-off-by: Thomas Gleixner <tglx@linutronix.de> #define preemptible() (preempt_count() == 0 && !irqs_disabled()) -@@ -298,6 +302,18 @@ do { \ +@@ -295,6 +299,18 @@ do { \ set_preempt_need_resched(); \ } while (0) |