restore lost packages from 0.2.3 + fix overwritten 0.2.4 files
- Restore 29 recipe symlinks (libdrm, qtbase, dbus, sddm, pipewire, etc.) - Restore 33 patches (KDE, libdrm, mesa, pipewire, sddm, wireplumber) - Restore 20+ local/scripts (audit, lint, test, build helpers) - Restore src/cook/scheduler.rs, status.rs, gnu-config/ - Restore scripts/patch-inclusion-gate.sh, run_mini1.sh, validate-collision-log.sh - Recover TLC source from HEAD (was overwritten by 0.2.3 checkout) - Recover 11 local/docs plans from HEAD (were overwritten) - Recover qt6-wayland-smoke symlink from HEAD - Fix MOTD: remove garbled ASCII art, use clean text - Update version: 0.2.0 -> 0.2.4 in os-release, motd, config - Reduce filesystem_size: 1536 -> 512 MiB - Add ABSOLUTE RULE to AGENTS.md: never delete/ignore packages - Reduce pcid scheme log verbosity: info -> debug
This commit is contained in:
@@ -0,0 +1,520 @@
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/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __LINUX_PREEMPT_H
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#define __LINUX_PREEMPT_H
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/*
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* include/linux/preempt.h - macros for accessing and manipulating
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* preempt_count (used for kernel preemption, interrupt count, etc.)
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*/
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#include <linux/linkage.h>
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#include <linux/cleanup.h>
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#include <linux/types.h>
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/*
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* We put the hardirq and softirq counter into the preemption
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* counter. The bitmask has the following meaning:
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*
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* - bits 0-7 are the preemption count (max preemption depth: 256)
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* - bits 8-15 are the softirq count (max # of softirqs: 256)
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*
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* The hardirq count could in theory be the same as the number of
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* interrupts in the system, but we run all interrupt handlers with
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* interrupts disabled, so we cannot have nesting interrupts. Though
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* there are a few palaeontologic drivers which reenable interrupts in
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* the handler, so we need more than one bit here.
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*
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* PREEMPT_MASK: 0x000000ff
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* SOFTIRQ_MASK: 0x0000ff00
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* HARDIRQ_MASK: 0x000f0000
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* NMI_MASK: 0x00f00000
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* PREEMPT_NEED_RESCHED: 0x80000000
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*/
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#define PREEMPT_BITS 8
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#define SOFTIRQ_BITS 8
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#define HARDIRQ_BITS 4
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#define NMI_BITS 4
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#define PREEMPT_SHIFT 0
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#define SOFTIRQ_SHIFT (PREEMPT_SHIFT + PREEMPT_BITS)
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#define HARDIRQ_SHIFT (SOFTIRQ_SHIFT + SOFTIRQ_BITS)
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#define NMI_SHIFT (HARDIRQ_SHIFT + HARDIRQ_BITS)
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#define __IRQ_MASK(x) ((1UL << (x))-1)
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#define PREEMPT_MASK (__IRQ_MASK(PREEMPT_BITS) << PREEMPT_SHIFT)
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#define SOFTIRQ_MASK (__IRQ_MASK(SOFTIRQ_BITS) << SOFTIRQ_SHIFT)
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#define HARDIRQ_MASK (__IRQ_MASK(HARDIRQ_BITS) << HARDIRQ_SHIFT)
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#define NMI_MASK (__IRQ_MASK(NMI_BITS) << NMI_SHIFT)
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#define PREEMPT_OFFSET (1UL << PREEMPT_SHIFT)
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#define SOFTIRQ_OFFSET (1UL << SOFTIRQ_SHIFT)
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#define HARDIRQ_OFFSET (1UL << HARDIRQ_SHIFT)
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#define NMI_OFFSET (1UL << NMI_SHIFT)
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#define SOFTIRQ_DISABLE_OFFSET (2 * SOFTIRQ_OFFSET)
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#define PREEMPT_DISABLED (PREEMPT_DISABLE_OFFSET + PREEMPT_ENABLED)
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/*
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* Disable preemption until the scheduler is running -- use an unconditional
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* value so that it also works on !PREEMPT_COUNT kernels.
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*
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* Reset by start_kernel()->sched_init()->init_idle()->init_idle_preempt_count().
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*/
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#define INIT_PREEMPT_COUNT PREEMPT_OFFSET
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/*
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* Initial preempt_count value; reflects the preempt_count schedule invariant
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* which states that during context switches:
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*
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* preempt_count() == 2*PREEMPT_DISABLE_OFFSET
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*
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* Note: PREEMPT_DISABLE_OFFSET is 0 for !PREEMPT_COUNT kernels.
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* Note: See finish_task_switch().
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*/
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#define FORK_PREEMPT_COUNT (2*PREEMPT_DISABLE_OFFSET + PREEMPT_ENABLED)
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/* preempt_count() and related functions, depends on PREEMPT_NEED_RESCHED */
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#include <asm/preempt.h>
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/**
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* interrupt_context_level - return interrupt context level
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*
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* Returns the current interrupt context level.
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* 0 - normal context
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* 1 - softirq context
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* 2 - hardirq context
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* 3 - NMI context
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*/
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static __always_inline unsigned char interrupt_context_level(void)
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{
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unsigned long pc = preempt_count();
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unsigned char level = 0;
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level += !!(pc & (NMI_MASK));
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level += !!(pc & (NMI_MASK | HARDIRQ_MASK));
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level += !!(pc & (NMI_MASK | HARDIRQ_MASK | SOFTIRQ_OFFSET));
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return level;
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}
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/*
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* These macro definitions avoid redundant invocations of preempt_count()
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* because such invocations would result in redundant loads given that
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* preempt_count() is commonly implemented with READ_ONCE().
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*/
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#define nmi_count() (preempt_count() & NMI_MASK)
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#define hardirq_count() (preempt_count() & HARDIRQ_MASK)
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#ifdef CONFIG_PREEMPT_RT
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# define softirq_count() (current->softirq_disable_cnt & SOFTIRQ_MASK)
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# define irq_count() ((preempt_count() & (NMI_MASK | HARDIRQ_MASK)) | softirq_count())
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#else
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# define softirq_count() (preempt_count() & SOFTIRQ_MASK)
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# define irq_count() (preempt_count() & (NMI_MASK | HARDIRQ_MASK | SOFTIRQ_MASK))
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#endif
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/*
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* Macros to retrieve the current execution context:
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*
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* in_nmi() - We're in NMI context
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* in_hardirq() - We're in hard IRQ context
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* in_serving_softirq() - We're in softirq context
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* in_task() - We're in task context
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*/
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#define in_nmi() (nmi_count())
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#define in_hardirq() (hardirq_count())
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#define in_serving_softirq() (softirq_count() & SOFTIRQ_OFFSET)
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#ifdef CONFIG_PREEMPT_RT
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# define in_task() (!((preempt_count() & (NMI_MASK | HARDIRQ_MASK)) | in_serving_softirq()))
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#else
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# define in_task() (!(preempt_count() & (NMI_MASK | HARDIRQ_MASK | SOFTIRQ_OFFSET)))
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#endif
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/*
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* The following macros are deprecated and should not be used in new code:
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* in_softirq() - We have BH disabled, or are processing softirqs
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* in_interrupt() - We're in NMI,IRQ,SoftIRQ context or have BH disabled
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*/
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#define in_softirq() (softirq_count())
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#define in_interrupt() (irq_count())
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/*
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* The preempt_count offset after preempt_disable();
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*/
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#if defined(CONFIG_PREEMPT_COUNT)
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# define PREEMPT_DISABLE_OFFSET PREEMPT_OFFSET
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#else
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# define PREEMPT_DISABLE_OFFSET 0
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#endif
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/*
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* The preempt_count offset after spin_lock()
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*/
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#if !defined(CONFIG_PREEMPT_RT)
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#define PREEMPT_LOCK_OFFSET PREEMPT_DISABLE_OFFSET
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#else
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/* Locks on RT do not disable preemption */
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#define PREEMPT_LOCK_OFFSET 0
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#endif
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/*
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* The preempt_count offset needed for things like:
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*
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* spin_lock_bh()
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*
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* Which need to disable both preemption (CONFIG_PREEMPT_COUNT) and
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* softirqs, such that unlock sequences of:
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*
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* spin_unlock();
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* local_bh_enable();
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*
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* Work as expected.
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*/
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#define SOFTIRQ_LOCK_OFFSET (SOFTIRQ_DISABLE_OFFSET + PREEMPT_LOCK_OFFSET)
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/*
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* Are we running in atomic context? WARNING: this macro cannot
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* always detect atomic context; in particular, it cannot know about
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* held spinlocks in non-preemptible kernels. Thus it should not be
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* used in the general case to determine whether sleeping is possible.
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* Do not use in_atomic() in driver code.
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*/
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#define in_atomic() (preempt_count() != 0)
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/*
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* Check whether we were atomic before we did preempt_disable():
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* (used by the scheduler)
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*/
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#define in_atomic_preempt_off() (preempt_count() != PREEMPT_DISABLE_OFFSET)
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#if defined(CONFIG_DEBUG_PREEMPT) || defined(CONFIG_TRACE_PREEMPT_TOGGLE)
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extern void preempt_count_add(int val);
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extern void preempt_count_sub(int val);
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#define preempt_count_dec_and_test() \
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({ preempt_count_sub(1); should_resched(0); })
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#else
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#define preempt_count_add(val) __preempt_count_add(val)
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#define preempt_count_sub(val) __preempt_count_sub(val)
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#define preempt_count_dec_and_test() __preempt_count_dec_and_test()
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#endif
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#define __preempt_count_inc() __preempt_count_add(1)
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#define __preempt_count_dec() __preempt_count_sub(1)
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#define preempt_count_inc() preempt_count_add(1)
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#define preempt_count_dec() preempt_count_sub(1)
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#ifdef CONFIG_PREEMPT_COUNT
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#define preempt_disable() \
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do { \
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preempt_count_inc(); \
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barrier(); \
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} while (0)
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#define sched_preempt_enable_no_resched() \
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do { \
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barrier(); \
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preempt_count_dec(); \
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} while (0)
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#define preempt_enable_no_resched() sched_preempt_enable_no_resched()
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#define preemptible() (preempt_count() == 0 && !irqs_disabled())
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#ifdef CONFIG_PREEMPTION
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#define preempt_enable() \
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do { \
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barrier(); \
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if (unlikely(preempt_count_dec_and_test())) \
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__preempt_schedule(); \
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} while (0)
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#define preempt_enable_notrace() \
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do { \
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barrier(); \
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if (unlikely(__preempt_count_dec_and_test())) \
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__preempt_schedule_notrace(); \
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} while (0)
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#define preempt_check_resched() \
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do { \
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if (should_resched(0)) \
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__preempt_schedule(); \
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} while (0)
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#else /* !CONFIG_PREEMPTION */
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#define preempt_enable() \
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do { \
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barrier(); \
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preempt_count_dec(); \
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} while (0)
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#define preempt_enable_notrace() \
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do { \
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barrier(); \
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__preempt_count_dec(); \
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} while (0)
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#define preempt_check_resched() do { } while (0)
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#endif /* CONFIG_PREEMPTION */
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#define preempt_disable_notrace() \
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do { \
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__preempt_count_inc(); \
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barrier(); \
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} while (0)
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#define preempt_enable_no_resched_notrace() \
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do { \
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barrier(); \
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__preempt_count_dec(); \
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} while (0)
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#else /* !CONFIG_PREEMPT_COUNT */
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/*
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* Even if we don't have any preemption, we need preempt disable/enable
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* to be barriers, so that we don't have things like get_user/put_user
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* that can cause faults and scheduling migrate into our preempt-protected
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* region.
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*/
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#define preempt_disable() barrier()
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#define sched_preempt_enable_no_resched() barrier()
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#define preempt_enable_no_resched() barrier()
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#define preempt_enable() barrier()
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#define preempt_check_resched() do { } while (0)
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#define preempt_disable_notrace() barrier()
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#define preempt_enable_no_resched_notrace() barrier()
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#define preempt_enable_notrace() barrier()
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#define preemptible() 0
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#endif /* CONFIG_PREEMPT_COUNT */
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#ifdef MODULE
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/*
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* Modules have no business playing preemption tricks.
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*/
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#undef sched_preempt_enable_no_resched
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#undef preempt_enable_no_resched
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#undef preempt_enable_no_resched_notrace
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#undef preempt_check_resched
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#endif
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#define preempt_set_need_resched() \
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do { \
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set_preempt_need_resched(); \
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} while (0)
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#define preempt_fold_need_resched() \
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do { \
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if (tif_need_resched()) \
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set_preempt_need_resched(); \
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} while (0)
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#ifdef CONFIG_PREEMPT_NOTIFIERS
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struct preempt_notifier;
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struct task_struct;
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/**
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* preempt_ops - notifiers called when a task is preempted and rescheduled
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* @sched_in: we're about to be rescheduled:
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* notifier: struct preempt_notifier for the task being scheduled
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* cpu: cpu we're scheduled on
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* @sched_out: we've just been preempted
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* notifier: struct preempt_notifier for the task being preempted
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* next: the task that's kicking us out
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*
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* Please note that sched_in and out are called under different
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* contexts. sched_out is called with rq lock held and irq disabled
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* while sched_in is called without rq lock and irq enabled. This
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* difference is intentional and depended upon by its users.
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*/
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struct preempt_ops {
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void (*sched_in)(struct preempt_notifier *notifier, int cpu);
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void (*sched_out)(struct preempt_notifier *notifier,
|
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struct task_struct *next);
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};
|
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|
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/**
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* preempt_notifier - key for installing preemption notifiers
|
||||
* @link: internal use
|
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* @ops: defines the notifier functions to be called
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*
|
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* Usually used in conjunction with container_of().
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*/
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struct preempt_notifier {
|
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struct hlist_node link;
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struct preempt_ops *ops;
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};
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|
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void preempt_notifier_inc(void);
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void preempt_notifier_dec(void);
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void preempt_notifier_register(struct preempt_notifier *notifier);
|
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void preempt_notifier_unregister(struct preempt_notifier *notifier);
|
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|
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static inline void preempt_notifier_init(struct preempt_notifier *notifier,
|
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struct preempt_ops *ops)
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{
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/* INIT_HLIST_NODE() open coded, to avoid dependency on list.h */
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notifier->link.next = NULL;
|
||||
notifier->link.pprev = NULL;
|
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notifier->ops = ops;
|
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}
|
||||
|
||||
#endif
|
||||
|
||||
/*
|
||||
* Migrate-Disable and why it is undesired.
|
||||
*
|
||||
* When a preempted task becomes eligible to run under the ideal model (IOW it
|
||||
* becomes one of the M highest priority tasks), it might still have to wait
|
||||
* for the preemptee's migrate_disable() section to complete. Thereby suffering
|
||||
* a reduction in bandwidth in the exact duration of the migrate_disable()
|
||||
* section.
|
||||
*
|
||||
* Per this argument, the change from preempt_disable() to migrate_disable()
|
||||
* gets us:
|
||||
*
|
||||
* - a higher priority tasks gains reduced wake-up latency; with preempt_disable()
|
||||
* it would have had to wait for the lower priority task.
|
||||
*
|
||||
* - a lower priority tasks; which under preempt_disable() could've instantly
|
||||
* migrated away when another CPU becomes available, is now constrained
|
||||
* by the ability to push the higher priority task away, which might itself be
|
||||
* in a migrate_disable() section, reducing its available bandwidth.
|
||||
*
|
||||
* IOW it trades latency / moves the interference term, but it stays in the
|
||||
* system, and as long as it remains unbounded, the system is not fully
|
||||
* deterministic.
|
||||
*
|
||||
*
|
||||
* The reason we have it anyway.
|
||||
*
|
||||
* PREEMPT_RT breaks a number of assumptions traditionally held. By forcing a
|
||||
* number of primitives into becoming preemptible, they would also allow
|
||||
* migration. This turns out to break a bunch of per-cpu usage. To this end,
|
||||
* all these primitives employ migrate_disable() to restore this implicit
|
||||
* assumption.
|
||||
*
|
||||
* This is a 'temporary' work-around at best. The correct solution is getting
|
||||
* rid of the above assumptions and reworking the code to employ explicit
|
||||
* per-cpu locking or short preempt-disable regions.
|
||||
*
|
||||
* The end goal must be to get rid of migrate_disable(), alternatively we need
|
||||
* a schedulability theory that does not depend on arbitrary migration.
|
||||
*
|
||||
*
|
||||
* Notes on the implementation.
|
||||
*
|
||||
* The implementation is particularly tricky since existing code patterns
|
||||
* dictate neither migrate_disable() nor migrate_enable() is allowed to block.
|
||||
* This means that it cannot use cpus_read_lock() to serialize against hotplug,
|
||||
* nor can it easily migrate itself into a pending affinity mask change on
|
||||
* migrate_enable().
|
||||
*
|
||||
*
|
||||
* Note: even non-work-conserving schedulers like semi-partitioned depends on
|
||||
* migration, so migrate_disable() is not only a problem for
|
||||
* work-conserving schedulers.
|
||||
*
|
||||
*/
|
||||
|
||||
/**
|
||||
* preempt_disable_nested - Disable preemption inside a normally preempt disabled section
|
||||
*
|
||||
* Use for code which requires preemption protection inside a critical
|
||||
* section which has preemption disabled implicitly on non-PREEMPT_RT
|
||||
* enabled kernels, by e.g.:
|
||||
* - holding a spinlock/rwlock
|
||||
* - soft interrupt context
|
||||
* - regular interrupt handlers
|
||||
*
|
||||
* On PREEMPT_RT enabled kernels spinlock/rwlock held sections, soft
|
||||
* interrupt context and regular interrupt handlers are preemptible and
|
||||
* only prevent migration. preempt_disable_nested() ensures that preemption
|
||||
* is disabled for cases which require CPU local serialization even on
|
||||
* PREEMPT_RT. For non-PREEMPT_RT kernels this is a NOP.
|
||||
*
|
||||
* The use cases are code sequences which are not serialized by a
|
||||
* particular lock instance, e.g.:
|
||||
* - seqcount write side critical sections where the seqcount is not
|
||||
* associated to a particular lock and therefore the automatic
|
||||
* protection mechanism does not work. This prevents a live lock
|
||||
* against a preempting high priority reader.
|
||||
* - RMW per CPU variable updates like vmstat.
|
||||
*/
|
||||
/* Macro to avoid header recursion hell vs. lockdep */
|
||||
#define preempt_disable_nested() \
|
||||
do { \
|
||||
if (IS_ENABLED(CONFIG_PREEMPT_RT)) \
|
||||
preempt_disable(); \
|
||||
else \
|
||||
lockdep_assert_preemption_disabled(); \
|
||||
} while (0)
|
||||
|
||||
/**
|
||||
* preempt_enable_nested - Undo the effect of preempt_disable_nested()
|
||||
*/
|
||||
static __always_inline void preempt_enable_nested(void)
|
||||
{
|
||||
if (IS_ENABLED(CONFIG_PREEMPT_RT))
|
||||
preempt_enable();
|
||||
}
|
||||
|
||||
DEFINE_LOCK_GUARD_0(preempt, preempt_disable(), preempt_enable())
|
||||
DEFINE_LOCK_GUARD_0(preempt_notrace, preempt_disable_notrace(), preempt_enable_notrace())
|
||||
|
||||
#ifdef CONFIG_PREEMPT_DYNAMIC
|
||||
|
||||
extern bool preempt_model_none(void);
|
||||
extern bool preempt_model_voluntary(void);
|
||||
extern bool preempt_model_full(void);
|
||||
extern bool preempt_model_lazy(void);
|
||||
|
||||
#else
|
||||
|
||||
static inline bool preempt_model_none(void)
|
||||
{
|
||||
return IS_ENABLED(CONFIG_PREEMPT_NONE);
|
||||
}
|
||||
static inline bool preempt_model_voluntary(void)
|
||||
{
|
||||
return IS_ENABLED(CONFIG_PREEMPT_VOLUNTARY);
|
||||
}
|
||||
static inline bool preempt_model_full(void)
|
||||
{
|
||||
return IS_ENABLED(CONFIG_PREEMPT);
|
||||
}
|
||||
|
||||
static inline bool preempt_model_lazy(void)
|
||||
{
|
||||
return IS_ENABLED(CONFIG_PREEMPT_LAZY);
|
||||
}
|
||||
|
||||
#endif
|
||||
|
||||
static inline bool preempt_model_rt(void)
|
||||
{
|
||||
return IS_ENABLED(CONFIG_PREEMPT_RT);
|
||||
}
|
||||
|
||||
extern const char *preempt_model_str(void);
|
||||
|
||||
/*
|
||||
* Does the preemption model allow non-cooperative preemption?
|
||||
*
|
||||
* For !CONFIG_PREEMPT_DYNAMIC kernels this is an exact match with
|
||||
* CONFIG_PREEMPTION; for CONFIG_PREEMPT_DYNAMIC this doesn't work as the
|
||||
* kernel is *built* with CONFIG_PREEMPTION=y but may run with e.g. the
|
||||
* PREEMPT_NONE model.
|
||||
*/
|
||||
static inline bool preempt_model_preemptible(void)
|
||||
{
|
||||
return preempt_model_full() || preempt_model_lazy() || preempt_model_rt();
|
||||
}
|
||||
|
||||
#endif /* __LINUX_PREEMPT_H */
|
||||
Reference in New Issue
Block a user