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Diffstat (limited to '')
| -rw-r--r-- | debian/patches-rt/0296-hrtimer-Add-a-missing-bracket-and-hide-migration_bas.patch | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/debian/patches-rt/0296-hrtimer-Add-a-missing-bracket-and-hide-migration_bas.patch b/debian/patches-rt/0296-hrtimer-Add-a-missing-bracket-and-hide-migration_bas.patch new file mode 100644 index 000000000..54806bcb2 --- /dev/null +++ b/debian/patches-rt/0296-hrtimer-Add-a-missing-bracket-and-hide-migration_bas.patch @@ -0,0 +1,75 @@ +From 1f69d8dae481d24ebdbd40717196cc8e36553976 Mon Sep 17 00:00:00 2001 +From: Sebastian Andrzej Siewior <bigeasy@linutronix.de> +Date: Wed, 4 Sep 2019 16:55:27 +0200 +Subject: [PATCH 296/347] hrtimer: Add a missing bracket and hide + `migration_base' on !SMP +Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.19/older/patches-4.19.246-rt110.tar.xz + +[ Upstream commit 47b6de0b7f22c28b40275aeede3993d807668c3b ] + +[ Upstream commit 5d2295f3a93b04986d069ebeaf5b07725f9096c1 ] + +The recent change to avoid taking the expiry lock when a timer is currently +migrated missed to add a bracket at the end of the if statement leading to +compile errors. Since that commit the variable `migration_base' is always +used but it is only available on SMP configuration thus leading to another +compile error. The changelog says "The timer base and base->cpu_base +cannot be NULL in the code path", so it is safe to limit this check to SMP +configurations only. + +Add the missing bracket to the if statement and hide `migration_base' +behind CONFIG_SMP bars. + +[ tglx: Mark the functions inline ... ] + +Fixes: 68b2c8c1e4210 ("hrtimer: Don't take expiry_lock when timer is currently migrated") +Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> +Signed-off-by: Thomas Gleixner <tglx@linutronix.de> +Link: https://lkml.kernel.org/r/20190904145527.eah7z56ntwobqm6j@linutronix.de +Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org> +[bigeasy: port back to RT] +Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> +--- + kernel/time/hrtimer.c | 12 +++++++++++- + 1 file changed, 11 insertions(+), 1 deletion(-) + +diff --git a/kernel/time/hrtimer.c b/kernel/time/hrtimer.c +index 3f9d156c36f1..0f841f18c363 100644 +--- a/kernel/time/hrtimer.c ++++ b/kernel/time/hrtimer.c +@@ -150,6 +150,11 @@ static struct hrtimer_cpu_base migration_cpu_base = { + + #define migration_base migration_cpu_base.clock_base[0] + ++static inline bool is_migration_base(struct hrtimer_clock_base *base) ++{ ++ return base == &migration_base; ++} ++ + /* + * We are using hashed locking: holding per_cpu(hrtimer_bases)[n].lock + * means that all timers which are tied to this base via timer->base are +@@ -274,6 +279,11 @@ switch_hrtimer_base(struct hrtimer *timer, struct hrtimer_clock_base *base, + + #else /* CONFIG_SMP */ + ++static inline bool is_migration_base(struct hrtimer_clock_base *base) ++{ ++ return false; ++} ++ + static inline struct hrtimer_clock_base * + lock_hrtimer_base(const struct hrtimer *timer, unsigned long *flags) + { +@@ -961,7 +971,7 @@ void hrtimer_grab_expiry_lock(const struct hrtimer *timer) + { + struct hrtimer_clock_base *base = READ_ONCE(timer->base); + +- if (timer->is_soft && base != &migration_base) { ++ if (timer->is_soft && is_migration_base(base)) { + spin_lock(&base->cpu_base->softirq_expiry_lock); + spin_unlock(&base->cpu_base->softirq_expiry_lock); + } +-- +2.36.1 + |