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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-08 03:21:37 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-08 03:21:37 +0000 |
commit | 06343b27411344fc542f4f3a643f8441aa35252d (patch) | |
tree | 66aa45187c93c350bbdf7e6ae4467a70bf3a8f4c /debian/patches-rt/0229-hotplug-duct-tape-RT-rwlock-usage-for-non-RT.patch | |
parent | Merging upstream version 4.19.260. (diff) | |
download | linux-06343b27411344fc542f4f3a643f8441aa35252d.tar.xz linux-06343b27411344fc542f4f3a643f8441aa35252d.zip |
Adding debian version 4.19.260-1.debian/4.19.260-1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'debian/patches-rt/0229-hotplug-duct-tape-RT-rwlock-usage-for-non-RT.patch')
-rw-r--r-- | debian/patches-rt/0229-hotplug-duct-tape-RT-rwlock-usage-for-non-RT.patch | 98 |
1 files changed, 98 insertions, 0 deletions
diff --git a/debian/patches-rt/0229-hotplug-duct-tape-RT-rwlock-usage-for-non-RT.patch b/debian/patches-rt/0229-hotplug-duct-tape-RT-rwlock-usage-for-non-RT.patch new file mode 100644 index 000000000..357c70d07 --- /dev/null +++ b/debian/patches-rt/0229-hotplug-duct-tape-RT-rwlock-usage-for-non-RT.patch @@ -0,0 +1,98 @@ +From: Sebastian Andrzej Siewior <bigeasy@linutronix.de> +Date: Fri, 4 Aug 2017 18:31:00 +0200 +Subject: [PATCH 229/342] hotplug: duct-tape RT-rwlock usage for non-RT +Origin: https://git.kernel.org/cgit/linux/kernel/git/rt/linux-stable-rt.git/commit?id=c925857dee98daf7eea5dd1e206a94a9d9cd72cf + +This type is only available on -RT. We need to craft something for +non-RT. Since the only migrate_disable() user is -RT only, there is no +damage. + +Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> +--- + kernel/cpu.c | 14 +++++++++++++- + 1 file changed, 13 insertions(+), 1 deletion(-) + +diff --git a/kernel/cpu.c b/kernel/cpu.c +index 56cb58fce84c..6ae5b18bf3a5 100644 +--- a/kernel/cpu.c ++++ b/kernel/cpu.c +@@ -78,7 +78,7 @@ static DEFINE_PER_CPU(struct cpuhp_cpu_state, cpuhp_state) = { + .fail = CPUHP_INVALID, + }; + +-#ifdef CONFIG_HOTPLUG_CPU ++#if defined(CONFIG_HOTPLUG_CPU) && defined(CONFIG_PREEMPT_RT_FULL) + static DEFINE_PER_CPU(struct rt_rw_lock, cpuhp_pin_lock) = \ + __RWLOCK_RT_INITIALIZER(cpuhp_pin_lock); + #endif +@@ -294,6 +294,7 @@ static int cpu_hotplug_disabled; + */ + void pin_current_cpu(void) + { ++#ifdef CONFIG_PREEMPT_RT_FULL + struct rt_rw_lock *cpuhp_pin; + unsigned int cpu; + int ret; +@@ -316,6 +317,7 @@ void pin_current_cpu(void) + goto again; + } + current->pinned_on_cpu = cpu; ++#endif + } + + /** +@@ -323,6 +325,7 @@ void pin_current_cpu(void) + */ + void unpin_current_cpu(void) + { ++#ifdef CONFIG_PREEMPT_RT_FULL + struct rt_rw_lock *cpuhp_pin = this_cpu_ptr(&cpuhp_pin_lock); + + if (WARN_ON(current->pinned_on_cpu != smp_processor_id())) +@@ -330,6 +333,7 @@ void unpin_current_cpu(void) + + current->pinned_on_cpu = -1; + __read_rt_unlock(cpuhp_pin); ++#endif + } + + DEFINE_STATIC_PERCPU_RWSEM(cpu_hotplug_lock); +@@ -954,7 +958,9 @@ static int take_cpu_down(void *_param) + + static int takedown_cpu(unsigned int cpu) + { ++#ifdef CONFIG_PREEMPT_RT_FULL + struct rt_rw_lock *cpuhp_pin = per_cpu_ptr(&cpuhp_pin_lock, cpu); ++#endif + struct cpuhp_cpu_state *st = per_cpu_ptr(&cpuhp_state, cpu); + int err; + +@@ -967,14 +973,18 @@ static int takedown_cpu(unsigned int cpu) + */ + irq_lock_sparse(); + ++#ifdef CONFIG_PREEMPT_RT_FULL + __write_rt_lock(cpuhp_pin); ++#endif + + /* + * So now all preempt/rcu users must observe !cpu_active(). + */ + err = stop_machine_cpuslocked(take_cpu_down, NULL, cpumask_of(cpu)); + if (err) { ++#ifdef CONFIG_PREEMPT_RT_FULL + __write_rt_unlock(cpuhp_pin); ++#endif + /* CPU refused to die */ + irq_unlock_sparse(); + /* Unpark the hotplug thread so we can rollback there */ +@@ -993,7 +1003,9 @@ static int takedown_cpu(unsigned int cpu) + wait_for_ap_thread(st, false); + BUG_ON(st->state != CPUHP_AP_IDLE_DEAD); + ++#ifdef CONFIG_PREEMPT_RT_FULL + __write_rt_unlock(cpuhp_pin); ++#endif + /* Interrupts are moved away from the dying cpu, reenable alloc/free */ + irq_unlock_sparse(); + |