4 Commits

Author	SHA1	Message	Date
Ralf Baechle	8a1e97ee2e	[MIPS] SMTC: Fix recursion in instant IPI replay code. ... local_irq_restore -> raw_local_irq_restore -> irq_restore_epilog -> smtc_ipi_replay -> smtc_ipi_dq -> spin_unlock_irqrestore -> _spin_unlock_irqrestore -> local_irq_restore The recursion does abort when there is no more IPI queued for a CPU, so this isn't usually fatal which is why we got away with this for so long until this was discovered by code inspection. Signed-off-by: Ralf Baechle <ralf@linux-mips.org>	2007-03-29 23:46:36 +01:00
Ralf Baechle	ac8be95504	[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>	2007-01-23 18:26:47 +00:00
Atsushi Nemoto	eae6c0da9d	[MIPS] lockdep: fix TRACE_IRQFLAGS_SUPPORT ... In handle_sys and its variants, we must reload some registers which might be clobbered by trace_hardirqs_on(). Also we must make sure trace_hardirqs_on() called in kernel level (not exception level). Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>	2006-10-01 23:16:57 +01:00
Ralf Baechle	192ef36619	[MIPS] TRACE_IRQFLAGS_SUPPORT support. ... Signed-off-by: Ralf Baechle <ralf@linux-mips.org>	2006-07-13 21:26:09 +01:00