Messages in this thread | | | Date | Wed, 24 Jul 2002 13:47:41 +0200 (CEST) | From | Ingo Molnar <> | Subject | [patch] irqlock patch 2.5.27-H4 |
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the latest irqlock patch can be found at:
http://redhat.com/~mingo/remove-irqlock-patches/remove-irqlock-2.5.27-H4
Changes in -H4:
- fix the cli()/sti() hack in ide/main.c, per Marcin Dalecki's suggestion. [this leaves the tty layer as the only remaining subsystem that still has cli()/sti() related hacks.]
Changes in -H3:
- init thread needs to have preempt_count of 1 until sched_init(). (William Lee Irwin III)
- clean up the irq-mask macros. (Linus)
- add barrier() to irq_enter() and irq_exit(). (based on Oleg Nesterov's comment.)
- move the irqs-off check into preempt_schedule() and remove CONFIG_DEBUG_IRQ_SCHEDULE.
Changes in -G5:
- remove spin_unlock_no_resched() and comment the affected places more agressively.
Changes in -G3:
- slab.c needs to spin_unlock_no_resched(), instead of spin_unlock(). (It also has to check for preemption in the right spot.) This should fix the memory corruption.
- irq_exit() needs to run softirqs if interrupts not active - in the previous patch it ran them when preempt_count() was 0, which is incorrect.
- spinlock macros are updated to enable preemption after enabling interrupts. Besides avoiding false positive warnings, this also
- fork.c has to call scheduler_tick() with preemption disabled - otherwise scheduler_tick()'s spin_unlock can preempt!
- irqs_disabled() macro introduced.
- [ all other local_irq_enable() or sti instances conditional on CONFIG_DEBUG_IRQ_SCHEDULE are to fix false positive warnings. ]
Changes in -G0:
- fix buggy in_softirq(). Fortunately the bug made the test broader, which didnt result in algorithmical breakage, just suboptimal performance.
- move do_softirq() processing into irq_exit() => this also fixes the softirq processing bugs present in apic.c IRQ handlers that did not test for softirqs after irq_exit().
- simplify local_bh_enable().
Changes in -F9:
- replace all instances of:
local_save_flags(flags); local_irq_disable();
with the shorter form of:
local_irq_save(flags);
about 30 files are affected by this change.
Changes in -F8:
- preempt/hardirq/softirq count separation, cleanups.
- skbuff.c fix.
- use irq_count() in scheduler_tick()
Changes in -F3:
- the entry.S cleanups/speedups by Oleg Nesterov.
- a rather critical synchronize_irq() bugfix: if a driver frees an interrupt that is still being probed then synchronize_irq() locks up. This bug has caused a spurious boot-lockup on one of my testsystems, ifconfig would lock up trying to close eth0.
- remove duplicate definitions from asm-i386/system.h, this fixes compiler warnings.
Ingo
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