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Diffstat (limited to '')
-rw-r--r-- | debian/patches-rt/0005-drm-i915-Don-t-check-for-atomic-context-on-PREEMPT_R.patch | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/debian/patches-rt/0005-drm-i915-Don-t-check-for-atomic-context-on-PREEMPT_R.patch b/debian/patches-rt/0005-drm-i915-Don-t-check-for-atomic-context-on-PREEMPT_R.patch new file mode 100644 index 0000000000..4af9325678 --- /dev/null +++ b/debian/patches-rt/0005-drm-i915-Don-t-check-for-atomic-context-on-PREEMPT_R.patch @@ -0,0 +1,30 @@ +From: Sebastian Andrzej Siewior <bigeasy@linutronix.de> +Date: Mon, 25 Oct 2021 15:05:18 +0200 +Subject: [PATCH 05/10] drm/i915: Don't check for atomic context on PREEMPT_RT +Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/6.6/older/patches-6.6.7-rt18.tar.xz + +The !in_atomic() check in _wait_for_atomic() triggers on PREEMPT_RT +because the uncore::lock is a spinlock_t and does not disable +preemption or interrupts. + +Changing the uncore:lock to a raw_spinlock_t doubles the worst case +latency on an otherwise idle testbox during testing. Therefore I'm +currently unsure about changing this. + +Link: https://lore.kernel.org/all/20211006164628.s2mtsdd2jdbfyf7g@linutronix.de/ +Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> +--- + drivers/gpu/drm/i915/i915_utils.h | 2 +- + 1 file changed, 1 insertion(+), 1 deletion(-) + +--- a/drivers/gpu/drm/i915/i915_utils.h ++++ b/drivers/gpu/drm/i915/i915_utils.h +@@ -288,7 +288,7 @@ wait_remaining_ms_from_jiffies(unsigned + #define wait_for(COND, MS) _wait_for((COND), (MS) * 1000, 10, 1000) + + /* If CONFIG_PREEMPT_COUNT is disabled, in_atomic() always reports false. */ +-#if defined(CONFIG_DRM_I915_DEBUG) && defined(CONFIG_PREEMPT_COUNT) ++#if defined(CONFIG_DRM_I915_DEBUG) && defined(CONFIG_PREEMPT_COUNT) && !defined(CONFIG_PREEMPT_RT) + # define _WAIT_FOR_ATOMIC_CHECK(ATOMIC) WARN_ON_ONCE((ATOMIC) && !in_atomic()) + #else + # define _WAIT_FOR_ATOMIC_CHECK(ATOMIC) do { } while (0) |