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Ralf Baechle 4b3e975e4a [MIPS] Fix scheduling latency issue on 24K, 34K and 74K cores 
The idle loop goes to sleep using the WAIT instruction if !need_resched().
This has is suffering from from a race condition that if if just after
need_resched has returned 0 an interrupt might set TIF_NEED_RESCHED but
we've just completed the test so go to sleep anyway.  This would be
trivial to fix by just disabling interrupts during that sequence as in:

        local_irq_disable();
        if (!need_resched())
                __asm__("wait");
        local_irq_enable();

but the processor architecture leaves it undefined if a processor calling
WAIT with interrupts disabled will ever restart its pipeline and indeed
some processors have made use of the freedom provided by the architecture
definition.  This has been resolved and the Config7.WII bit indicates that
the use of WAIT is safe on 24K, 24KE and 34K cores.  It also is safe on
74K starting revision 2.1.0 so enable the use of WAIT with interrupts
disabled for 74K based on a c0_prid of at least that.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
 		2007-07-06 16:17:11 +01:00
..
Makefile [MIPS] Fix and cleanup the mess that a dozen prom_printf variants are. 2007-03-04 19:02:37 +00:00
asm-offsets.c rename thread_info to stack 2007-05-09 12:30:56 -07:00
binfmt_elfn32.c
…
binfmt_elfo32.c
…
branch.c
…
cpu-bugs64.c
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cpu-probe.c [MIPS] Fix scheduling latency issue on 24K, 34K and 74K cores 2007-07-06 16:17:11 +01:00
early_printk.c [MIPS] early_printk: allow the early console to run earlier 2007-05-11 14:28:30 +01:00
entry.S [MIPS] lockdep: Handle interrupts in R3000 style c0_status register. 2007-03-29 23:46:35 +01:00
gdb-low.S
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gdb-stub.c
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genex.S [MIPS] lockdep: Deal with interrupt disable hazard in TRACE_IRQFLAGS 2007-03-29 23:46:35 +01:00
head.S
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i8253.c
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i8259.c [MIPS] Register PCI host bridge resource earlier 2007-04-27 16:20:25 +01:00
init_task.c
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irix5sys.S
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irixelf.c header cleaning: don't include smp_lock.h when not used 2007-05-08 11:15:07 -07:00
irixinv.c
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irixioctl.c header cleaning: don't include smp_lock.h when not used 2007-05-08 11:15:07 -07:00
irixsig.c header cleaning: don't include smp_lock.h when not used 2007-05-08 11:15:07 -07:00
irq-msc01.c [MIPS] MT: Reenable EIC support and add support for SOCit SC. 2007-05-11 14:28:31 +01:00
irq-mv6434x.c
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irq-rm7000.c
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irq-rm9000.c
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irq.c [MIPS] Drop __devinit tag from allocate_irqno() and free_irqno() 2007-05-11 14:28:31 +01:00
irq_cpu.c
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kspd.c [MIPS] Fix AP/SP to work in the reality of modern kernels. 2007-04-27 16:20:23 +01:00
linux32.c [MIPS] Fix some system calls with long long arguments 2007-06-06 19:34:32 +01:00
machine_kexec.c
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mips-mt.c
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mips_ksyms.c [MIPS] Export __copy_user_inatomic. 2007-03-07 00:07:17 +00:00
module.c
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proc.c
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process.c
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ptrace.c header cleaning: don't include smp_lock.h when not used 2007-05-08 11:15:07 -07:00
ptrace32.c
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r4k_fpu.S [MIPS] Check FCSR for pending interrupts, alternative version 2007-03-17 01:03:25 +00:00
r4k_switch.S [MIPS] Remove duplicate fpu enable hazard code. 2007-06-06 19:34:31 +01:00
r2300_fpu.S
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r2300_switch.S [MIPS] Disallow CpU exception in kernel again. 2007-04-20 14:58:37 +01:00
r6000_fpu.S
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relocate_kernel.S
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reset.c
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rtlx.c [MIPS] Fix AP/SP to work in the reality of modern kernels. 2007-04-27 16:20:23 +01:00
scall32-o32.S [MIPS] Wire up utimensat, signalfd, timerfd, eventfd 2007-06-11 18:20:53 +01:00
scall64-64.S [MIPS] Wire up utimensat, signalfd, timerfd, eventfd 2007-06-11 18:20:53 +01:00
scall64-n32.S [MIPS] Wire up utimensat, signalfd, timerfd, eventfd 2007-06-11 18:20:53 +01:00
scall64-o32.S [MIPS] Wire up utimensat, signalfd, timerfd, eventfd 2007-06-11 18:20:53 +01:00
semaphore.c
…
setup.c [MIPS] Fix and cleanup the mess that a dozen prom_printf variants are. 2007-03-04 19:02:37 +00:00
signal-common.h [MIPS] Retry {save,restore}_fp_context if failed in atomic context. 2007-04-20 14:58:37 +01:00
signal.c header cleaning: don't include smp_lock.h when not used 2007-05-08 11:15:07 -07:00
signal32.c [MIPS] use compat_siginfo in rt_sigframe_n32 2007-06-26 19:57:33 +02:00
signal_n32.c [MIPS] use compat_siginfo in rt_sigframe_n32 2007-06-26 19:57:33 +02:00
smp-mt.c [MIPS] VSMP: Fix initialization ordering bug. 2007-07-04 15:53:16 +01:00
smp.c [MIPS] Fix modpost warnings by making start_secondary __cpuinit 2007-06-11 18:20:54 +01:00
smtc-asm.S [MIPS] SMTC: Don't set and restore irqregs ptr from self_ipi. 2007-06-11 18:20:53 +01:00
smtc-proc.c
…
smtc.c [MIPS] Count timer interrupts correctly. 2007-06-26 19:57:34 +02:00
stacktrace.c simplify the stacktrace code 2007-05-08 11:14:58 -07:00
syscall.c header cleaning: don't include smp_lock.h when not used 2007-05-08 11:15:07 -07:00
sysirix.c
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time.c [MIPS] Don't drag a platform specific header into generic arch code. 2007-06-20 22:27:10 +01:00
topology.c
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traps.c [MIPS] Fix timer/performance interrupt detection 2007-07-06 16:17:11 +01:00
unaligned.c Detach sched.h from mm.h 2007-05-21 09:18:19 -07:00
vmlinux.lds.S all-archs: consolidate .data section definition in asm-generic 2007-05-19 09:11:57 +02:00
vpe.c [MIPS] AP/SP: Avoid triggering the 34K E125 performance issue 2007-07-06 16:17:10 +01:00