linux-stable.git/arch/mips/kernel, branch linux-2.6.22.y

[MIPS] Fix scheduling latency issue on 24K, 34K and 74K cores

2007-07-06T15:17:11+00:00

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

[MIPS] Fix timer/performance interrupt detection

2007-07-06T15:17:11+00:00

Signed-off-by: Chris Dearman 
Signed-off-by: Ralf Baechle

[MIPS] AP/SP: Avoid triggering the 34K E125 performance issue

2007-07-06T15:17:10+00:00

C0_status doesn't need to be initialized at this point anyway; the register
will be initialized later.

Signed-off-by: Ralf Baechle

[MIPS] VSMP: Fix initialization ordering bug.

2007-07-04T14:53:16+00:00

Signed-off-by: Ralf Baechle

[MIPS] Count timer interrupts correctly.

2007-06-26T17:57:34+00:00

Signed-off-by: Chris Dearman 
Signed-off-by: Ralf Baechle

[MIPS] use compat_siginfo in rt_sigframe_n32

2007-06-26T17:57:33+00:00

Signed-off-by: Pavel Kiryukhin 
Signed-off-by: Ralf Baechle

[MIPS] 20K: Handle WAIT related bugs according to errata information

2007-06-26T17:57:33+00:00

We used to avoid the WAIT entirely on the 20K but really only need to do
this on early revs of the 20K.  Without this a 20K was a bit of a
power hog.  Well, in the lower power power hog category ;-)

Signed-off-by: Ralf Baechle

[MIPS] Don't drag a platform specific header into generic arch code.

2007-06-20T21:27:10+00:00

For some platforms it's definitions may conflict.  So that's the one-liner.
The rest is 10 square kilometers of collateral damage fixup this include
used to paper over.

Signed-off-by: Ralf Baechle

[MIPS] Separate performance counter interrupts

2007-06-14T17:25:15+00:00

Support for performance counter overflow interrupt that is on a separate
interrupt from the timer.

Signed-off-by: Chris Dearman 
Signed-off-by: Ralf Baechle

[MIPS] Fix modpost warnings by making start_secondary __cpuinit

2007-06-11T17:20:54+00:00

WARNING: arch/mips/kernel/built-in.o(.text+0x9a58): Section mismatch: reference to .init.text:cpu_report (between 'start_secondary' and 'smp_prepare_boot_cpu')
WARNING: arch/mips/kernel/built-in.o(.text+0x9a60): Section mismatch: reference to .init.text:per_cpu_trap_init (between 'start_secondary' and 'smp_prepare_boot_cpu')
WARNING: arch/mips/kernel/built-in.o(.text+0x9adc): Section mismatch: reference to .init.text:cpu_probe (between 'start_secondary' and 'smp_prepare_boot_cpu')
mipsel-linux-objcopy -S -O srec --remove-section=.reginfo --remove-section=.mdebug --remove-section=.comment --remove-section=.note --remove-section=.pdr --remove-section=.options --remove-section=.MIPS.options vmlinux arch/mips/boot/vmlinux.srec

Signed-off-by: Ralf Baechle