2412aa1293
In commit d166991234
idle: Implement generic idle function
Thomas Gleixner cleaned up many things but perturbed some
fragile code that was keeping ia64 alive. So we started
seeing:
WARNING: at kernel/cpu/idle.c:94 cpu_idle_loop+0x360/0x380()
and other unpleasantness like system hangs during boot.
We really shouldn't ever halt with interrupts disabled.
Signed-off-by: Tony Luck <tony.luck@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
Cc: Paul McKenney <paulmck@linux.vnet.ibm.com>
Cc: magnus.damm@gmail.com
Link: http://lkml.kernel.org/r/516d9a0c26048eae9c@agluck-desk.sc.intel.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
97 lines
2 KiB
C
97 lines
2 KiB
C
/*
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* IRQ flags defines.
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*
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* Copyright (C) 1998-2003 Hewlett-Packard Co
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* David Mosberger-Tang <davidm@hpl.hp.com>
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* Copyright (C) 1999 Asit Mallick <asit.k.mallick@intel.com>
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* Copyright (C) 1999 Don Dugger <don.dugger@intel.com>
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*/
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#ifndef _ASM_IA64_IRQFLAGS_H
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#define _ASM_IA64_IRQFLAGS_H
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#include <asm/pal.h>
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#ifdef CONFIG_IA64_DEBUG_IRQ
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extern unsigned long last_cli_ip;
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static inline void arch_maybe_save_ip(unsigned long flags)
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{
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if (flags & IA64_PSR_I)
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last_cli_ip = ia64_getreg(_IA64_REG_IP);
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}
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#else
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#define arch_maybe_save_ip(flags) do {} while (0)
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#endif
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/*
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* - clearing psr.i is implicitly serialized (visible by next insn)
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* - setting psr.i requires data serialization
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* - we need a stop-bit before reading PSR because we sometimes
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* write a floating-point register right before reading the PSR
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* and that writes to PSR.mfl
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*/
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static inline unsigned long arch_local_save_flags(void)
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{
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ia64_stop();
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#ifdef CONFIG_PARAVIRT
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return ia64_get_psr_i();
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#else
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return ia64_getreg(_IA64_REG_PSR);
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#endif
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}
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static inline unsigned long arch_local_irq_save(void)
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{
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unsigned long flags = arch_local_save_flags();
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ia64_stop();
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ia64_rsm(IA64_PSR_I);
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arch_maybe_save_ip(flags);
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return flags;
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}
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static inline void arch_local_irq_disable(void)
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{
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#ifdef CONFIG_IA64_DEBUG_IRQ
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arch_local_irq_save();
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#else
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ia64_stop();
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ia64_rsm(IA64_PSR_I);
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#endif
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}
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static inline void arch_local_irq_enable(void)
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{
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ia64_stop();
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ia64_ssm(IA64_PSR_I);
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ia64_srlz_d();
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}
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static inline void arch_local_irq_restore(unsigned long flags)
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{
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#ifdef CONFIG_IA64_DEBUG_IRQ
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unsigned long old_psr = arch_local_save_flags();
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#endif
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ia64_intrin_local_irq_restore(flags & IA64_PSR_I);
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arch_maybe_save_ip(old_psr & ~flags);
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}
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static inline bool arch_irqs_disabled_flags(unsigned long flags)
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{
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return (flags & IA64_PSR_I) == 0;
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}
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static inline bool arch_irqs_disabled(void)
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{
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return arch_irqs_disabled_flags(arch_local_save_flags());
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}
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static inline void arch_safe_halt(void)
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{
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arch_local_irq_enable();
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ia64_pal_halt_light(); /* PAL_HALT_LIGHT */
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}
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#endif /* _ASM_IA64_IRQFLAGS_H */
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