kernel/include/asm-mips, branch linux-2.6.22.y

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

2007-07-06T15:17:11Z

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] Add macros to encode processor revisions.

2007-07-06T15:17:11Z

Older processors used to encode processor version and revision in two 4-bit bitfields, the 4K seems to simply count up and even newer MTI cores have switched to use the 8-bits as 3:3:2 bitfield with the last field as the patch number. Signed-off-by: Ralf Baechle

[MIPS] RM7000: Enable ICACHE_REFILLS_WORKAROUND_WAR.

2007-07-06T15:17:11Z

The RM7000 processors and the E9000 cores have a bug (though PMC-Sierra opposes it being called that) where invalid instructions in the same I-cache line worth of instructions being fetched may case spurious exceptions. The workaround for this was only enabled for E9000 cores; enable it also for all RM7000-based platforms. Signed-off-by: Ralf Baechle

[MIPS] 64-bit TO_PHYS_MASK macro for RM9000 processors

2007-07-06T15:17:10Z

Signed-off-by: Andrew Sharp Signed-off-by: Ralf Baechle

[MIPS] Add whitelists for checksyscalls.sh

2007-07-04T14:53:16Z

Signed-off-by: Atsushi Nemoto Signed-off-by: Ralf Baechle

[MIPS] die(): Properly declare as non-returning

2007-07-04T14:53:15Z

This marks the declaration of die() correctly, removing "control reaches end of non-void function" warnings from non-void functions that die() at the end. Signed-off-by: Maciej W. Rozycki Signed-off-by: Ralf Baechle

[MIPS] Fix include wrapper symbol definitions in IP32 code.

2007-07-04T14:53:15Z

Some IP35 defines snuck into some IP32-specific code during the DMA re-write. Signed-off-by: Joshua Kinard Signed-off-by: Ralf Baechle

[MIPS] SMTC and non-SMTC kernel and modules are incompatible

2007-06-26T17:57:34Z

So don't allow mixing. Signed-off-by: Ralf Baechle

[MIPS] Remove a duplicated local variable in test_and_clear_bit()

2007-06-26T17:57:33Z

Fix a sparse warning caused by 2c921d07f8c641e691b0dfd80a5cfe14c60ec489 include2/asm/bitops.h:313:23: warning: symbol 'res' shadows an earlier one include2/asm/bitops.h:309:16: originally declared here Signed-off-by: Atsushi Nemoto Signed-off-by: Ralf Baechle

[MIPS] use compat_siginfo in rt_sigframe_n32

2007-06-26T17:57:33Z

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