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authorRalf Baechle <ralf@linux-mips.org>2007-01-20 01:18:01 +0100
committerRalf Baechle <ralf@linux-mips.org>2007-01-23 19:26:47 +0100
commitac8be955049dab828a68b9c68a75144832f8289f (patch)
treec9992cccbc6bcb2f099395ef614ebc96b91a2598 /arch/mips/vr41xx
parent[PATCH] x86: fix PDA variables to work during boot (diff)
downloadlinux-ac8be955049dab828a68b9c68a75144832f8289f.tar.xz
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[MIPS] SMTC: Instant IPI replay.
SMTC pseudo-interrupts between TCs are deferred and queued if the target TC is interrupt-inhibited (IXMT). In the first SMTC prototypes, these queued IPIs were serviced on return to user mode, or on entry into the kernel idle loop. The INSTANT_REPLAY option dispatches them as part of local_irq_restore() processing, which adds runtime overhead (hence the option to turn it off), but ensures that IPIs are handled promptly even under heavy I/O interrupt load. Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
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