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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
Renamed from include/asm-mips/interrupt.h (Browse further)