diff options
Diffstat (limited to 'debian/patches-rt/0066-lib-test_lockup-Minimum-fix-to-get-it-compiled-on-PR.patch')
| -rw-r--r-- | debian/patches-rt/0066-lib-test_lockup-Minimum-fix-to-get-it-compiled-on-PR.patch | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/debian/patches-rt/0066-lib-test_lockup-Minimum-fix-to-get-it-compiled-on-PR.patch b/debian/patches-rt/0066-lib-test_lockup-Minimum-fix-to-get-it-compiled-on-PR.patch new file mode 100644 index 000000000..e52831303 --- /dev/null +++ b/debian/patches-rt/0066-lib-test_lockup-Minimum-fix-to-get-it-compiled-on-PR.patch @@ -0,0 +1,65 @@ +From 11e632bdd63b66d70c365424a1ceb502cb0c02ef Mon Sep 17 00:00:00 2001 +From: Sebastian Andrzej Siewior <bigeasy@linutronix.de> +Date: Wed, 28 Oct 2020 18:55:27 +0100 +Subject: [PATCH 066/323] lib/test_lockup: Minimum fix to get it compiled on + PREEMPT_RT +Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/5.10/older/patches-5.10.204-rt100.tar.xz + +On PREEMPT_RT the locks are quite different so they can't be tested as +it is done below. The alternative is test for the waitlock within +rtmutex. + +This is the bare minim to get it compiled. Problems which exists on +PREEMP_RT: +- none of the locks (spinlock_t, rwlock_t, mutex_t, rw_semaphore) may be + acquired with disabled preemption or interrupts. + If I read the code correct the it is possible to acquire a mutex with + disabled interrupts. + I don't know how to obtain a lock pointer. Technically they are not + exported to userland. + +- memory can not be allocated with disabled premption or interrupts even + with GFP_ATOMIC. + +Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> +--- + lib/test_lockup.c | 16 ++++++++++++++++ + 1 file changed, 16 insertions(+) + +diff --git a/lib/test_lockup.c b/lib/test_lockup.c +index 78a630bbd03d..d27a80502204 100644 +--- a/lib/test_lockup.c ++++ b/lib/test_lockup.c +@@ -485,6 +485,21 @@ static int __init test_lockup_init(void) + return -EINVAL; + + #ifdef CONFIG_DEBUG_SPINLOCK ++#ifdef CONFIG_PREEMPT_RT ++ if (test_magic(lock_spinlock_ptr, ++ offsetof(spinlock_t, lock.wait_lock.magic), ++ SPINLOCK_MAGIC) || ++ test_magic(lock_rwlock_ptr, ++ offsetof(rwlock_t, rtmutex.wait_lock.magic), ++ SPINLOCK_MAGIC) || ++ test_magic(lock_mutex_ptr, ++ offsetof(struct mutex, lock.wait_lock.magic), ++ SPINLOCK_MAGIC) || ++ test_magic(lock_rwsem_ptr, ++ offsetof(struct rw_semaphore, rtmutex.wait_lock.magic), ++ SPINLOCK_MAGIC)) ++ return -EINVAL; ++#else + if (test_magic(lock_spinlock_ptr, + offsetof(spinlock_t, rlock.magic), + SPINLOCK_MAGIC) || +@@ -498,6 +513,7 @@ static int __init test_lockup_init(void) + offsetof(struct rw_semaphore, wait_lock.magic), + SPINLOCK_MAGIC)) + return -EINVAL; ++#endif + #endif + + if ((wait_state != TASK_RUNNING || +-- +2.43.0 + |