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authorDaniel Hellstrom <daniel@gaisler.com>2011-05-02 00:08:53 +0000
committerDavid S. Miller <davem@davemloft.net>2011-05-16 13:07:44 -0700
commitecbc42b70acbc6327adefe9635db93fcf62bf59d (patch)
treed6a58bc7c9b615bb90f88ed5bbb7f6a5a38e3df5 /arch/score/mm
parent1ca0c808c60f171c1949b0e7f3a4c0516855f7a0 (diff)
downloadblackbird-op-linux-ecbc42b70acbc6327adefe9635db93fcf62bf59d.tar.gz
blackbird-op-linux-ecbc42b70acbc6327adefe9635db93fcf62bf59d.zip
sparc32, sun4m: Implemented SMP IPIs support for SUN4M machines
Implement the three IPIs (resched, single and cpu-mask) generation and interrupt handler catch. The sun4m has 15 soft-IRQs and three of them is used with this patch, the three IPIs was previously implemented with the cross-call IRQ15 which does not work with locking routines such as spinlocks because IRQ15 is NMI, it may cause deadlock. The IRQ trap handler code assumes (in the same spritit as the old it seems) that hard interrupts will be generated until handled (level), when a IRQ happens the IRQ pending register is checked for pending soft-IRQs. When both hard and soft IRQ happens at the same time only soft-IRQs are handled. The old code implemented a soft-IRQ traphandler at IRQ14 which called smp_reschedule_irq which in turn called set_need_resched. It seems to be an old relic and is replaced with the interrupt traphander exit code RESTORE_ALL, it calls schedule() when appropriate. Signed-off-by: Daniel Hellstrom <daniel@gaisler.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch/score/mm')
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