Messages in this thread | | | Date | Sun, 21 Jul 2002 20:50:35 +0200 (CEST) | From | Ingo Molnar <> | Subject | [patch] "big IRQ lock" removal, 2.5.27-A1 |
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this is the next iteration of the big-IRQ-lock removal patch, against 2.5.27 + sched-fixes + ldt-fixes:
http://redhat.com/~mingo/remove-irqlock-patches/remove-irqlock-2.5.27-A1
one clarification wrt. disable_irq(): while it does not synchronize with all IRQ sources globally anymore, it does synchronize with that particular irq source (globally) - so drivers can use it safely to ensure that no pending IRQ handler is running on another CPU after disable_irq() has returned.
Changes:
- Oleg Nesterov noticed a do_IRQ() bug which can cause a reschedule in do_IRQ().
- George Anzinger noticed that local_bh_enable() did not re-run softirqs.
- Linus suggested to still define cli(), sti(), save_flags(), restore_flags() on UP kernels, to ease the transition.
the patch compiles, boots & works just fine on UP - on SMP it boots just fine using the following limited .config:
http://redhat.com/~mingo/remove-irqlock-patches/config
(the serial subsystem is disabled for example.)
Ingo
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