From fad60192b460274504d8a4929b881a8cce00abc5 Mon Sep 17 00:00:00 2001 From: Sebastian Andrzej Siewior Date: Fri, 8 Apr 2016 16:38:04 +0200 Subject: [ANNOUNCE] 4.4.6-rt14 Dear RT folks! I'm pleased to announce the v4.4.6-rt14 patch set. Changes since v4.4.6-rt13: - Dan Murphy reported that zram does not compile on !RT. Now it does. - The TWD timer is now enabled on IMX6Q configs even with !SMP. People with i.MX6SOLO should now see better cyclictest results with TWD than with the mxc-timer. Known issues: - CPU hotplug got a little better but can deadlock. The delta patch against 4.4.6-rt13 is appended below and can be found here: https://cdn.kernel.org/pub/linux/kernel/projects/rt/4.4/incr/patch-4.4.6-rt13-rt14.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 v4.4.6-rt14 The RT patch against 4.4.6 can be found here: https://cdn.kernel.org/pub/linux/kernel/projects/rt/4.4/patch-4.4.6-rt14.patch.xz The split quilt queue is available at: https://cdn.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4.6-rt14.tar.xz Sebastian Signed-off-by: Sebastian Andrzej Siewior --- patches/ARM-imx-always-use-TWD-on-IMX6Q.patch | 35 ++++++++++++++++++++++ ...ck-zram-Replace-bit-spinlocks-with-rtmute.patch | 2 +- patches/localversion.patch | 4 +-- patches/series | 1 + 4 files changed, 39 insertions(+), 3 deletions(-) create mode 100644 patches/ARM-imx-always-use-TWD-on-IMX6Q.patch diff --git a/patches/ARM-imx-always-use-TWD-on-IMX6Q.patch b/patches/ARM-imx-always-use-TWD-on-IMX6Q.patch new file mode 100644 index 00000000000000..68eb5d06c8f67d --- /dev/null +++ b/patches/ARM-imx-always-use-TWD-on-IMX6Q.patch @@ -0,0 +1,35 @@ +From: Sebastian Andrzej Siewior +Date: Wed, 6 Apr 2016 17:30:28 +0200 +Subject: [PATCH] ARM: imx: always use TWD on IMX6Q + +There is no reason to limit the TWD to be used on SMP kernels only if the +hardware has it available. +On Wandboard i.MX6SOLO, running PREEMPT-RT and cyclictest I see as max +immediately after start in idle: +UP : ~90us +SMP: ~50us +UP + TWD: ~20us. +Based on this numbers I prefer the TWD over the slightly slower MXC +timer. + +Signed-off-by: Sebastian Andrzej Siewior +--- + arch/arm/mach-imx/Kconfig | 2 +- + 1 file changed, 1 insertion(+), 1 deletion(-) + +diff --git a/arch/arm/mach-imx/Kconfig b/arch/arm/mach-imx/Kconfig +index 8ceda2844c4f..08bcf8fb76f2 100644 +--- a/arch/arm/mach-imx/Kconfig ++++ b/arch/arm/mach-imx/Kconfig +@@ -524,7 +524,7 @@ config SOC_IMX6Q + bool "i.MX6 Quad/DualLite support" + select ARM_ERRATA_764369 if SMP + select HAVE_ARM_SCU if SMP +- select HAVE_ARM_TWD if SMP ++ select HAVE_ARM_TWD + select PCI_DOMAINS if PCI + select PINCTRL_IMX6Q + select SOC_IMX6 +-- +2.8.0.rc3 + diff --git a/patches/drivers-block-zram-Replace-bit-spinlocks-with-rtmute.patch b/patches/drivers-block-zram-Replace-bit-spinlocks-with-rtmute.patch index 72c412350f53c9..95d530b64b4563 100644 --- a/patches/drivers-block-zram-Replace-bit-spinlocks-with-rtmute.patch +++ b/patches/drivers-block-zram-Replace-bit-spinlocks-with-rtmute.patch @@ -146,7 +146,7 @@ Signed-off-by: Sebastian Andrzej Siewior + bit_spin_unlock(ZRAM_ACCESS, &table->value); +} + -+static inline void zram_meta_init_locks(struct zram_meta *meta, u64 disksize) { } ++static inline void zram_meta_init_table_locks(struct zram_meta *meta, u64 disksize) { } +#else /* CONFIG_PREEMPT_RT_BASE */ +static inline void zram_lock_table(struct zram_table_entry *table) +{ diff --git a/patches/localversion.patch b/patches/localversion.patch index 523b2362c6114e..e0d89478ca3dbe 100644 --- a/patches/localversion.patch +++ b/patches/localversion.patch @@ -1,4 +1,4 @@ -Subject: v4.4.6-rt13 +Subject: v4.4.6-rt14 From: Thomas Gleixner Date: Fri, 08 Jul 2011 20:25:16 +0200 @@ -10,4 +10,4 @@ Signed-off-by: Thomas Gleixner --- /dev/null +++ b/localversion-rt @@ -0,0 +1 @@ -+-rt13 ++-rt14 diff --git a/patches/series b/patches/series index 7d906bc56e567f..5ab8bb0246b523 100644 --- a/patches/series +++ b/patches/series @@ -44,6 +44,7 @@ drivers-cpuidle-coupled-fix-warning-cpuidle_coupled_.patch drivers-media-vsp1_video-fix-compile-error.patch sc16is7xx_Drop_bogus_use_of_IRQF_ONESHOT.patch f2fs_Mutex_cant_be_used_by_down_write_nest_lock().patch +ARM-imx-always-use-TWD-on-IMX6Q.patch # Those two should vanish soon (not use PIT during bootup) at91_dont_enable_disable_clock.patch -- cgit 1.2.3-korg