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tile: support CONFIG_PREEMPT

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This change adds support for CONFIG_PREEMPT (full kernel preemption).
In addition to the core support, this change includes a number
of places where we fix up uses of smp_processor_id() and per-cpu
variables.  I also eliminate the PAGE_HOME_HERE and PAGE_HOME_UNKNOWN
values for page homing, as it turns out they weren't being used.

Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
This commit is contained in:
Chris Metcalf
2013-08-07 11:36:54 -04:00
parent 1182b69cb2
commit bc1a298f4e
14 changed files with 98 additions and 45 deletions
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21
arch/tile/include/asm/irqflags.h
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@@ -124,6 +124,12 @@
DECLARE_PER_CPU(unsigned long long, interrupts_enabled_mask);
#define INITIAL_INTERRUPTS_ENABLED (1ULL << INT_MEM_ERROR)
#ifdef CONFIG_DEBUG_PREEMPT
/* Due to inclusion issues, we can't rely on <linux/smp.h> here. */
extern unsigned int debug_smp_processor_id(void);
# define smp_processor_id() debug_smp_processor_id()
#endif
/* Disable interrupts. */
#define arch_local_irq_disable() \
interrupt_mask_set_mask(LINUX_MASKABLE_INTERRUPTS)
@@ -132,9 +138,18 @@ DECLARE_PER_CPU(unsigned long long, interrupts_enabled_mask);
#define arch_local_irq_disable_all() \
interrupt_mask_set_mask(-1ULL)
/*
* Read the set of maskable interrupts.
* We avoid the preemption warning here via __this_cpu_ptr since even
* if irqs are already enabled, it's harmless to read the wrong cpu's
* enabled mask.
*/
#define arch_local_irqs_enabled() \
(*__this_cpu_ptr(&interrupts_enabled_mask))
/* Re-enable all maskable interrupts. */
#define arch_local_irq_enable() \
interrupt_mask_reset_mask(__get_cpu_var(interrupts_enabled_mask))
interrupt_mask_reset_mask(arch_local_irqs_enabled())
/* Disable or enable interrupts based on flag argument. */
#define arch_local_irq_restore(disabled) do { \
@@ -161,7 +176,7 @@ DECLARE_PER_CPU(unsigned long long, interrupts_enabled_mask);
/* Prevent the given interrupt from being enabled next time we enable irqs. */
#define arch_local_irq_mask(interrupt) \
(__get_cpu_var(interrupts_enabled_mask) &= ~(1ULL << (interrupt)))
this_cpu_and(interrupts_enabled_mask, ~(1ULL << (interrupt)))
/* Prevent the given interrupt from being enabled immediately. */
#define arch_local_irq_mask_now(interrupt) do { \
@@ -171,7 +186,7 @@ DECLARE_PER_CPU(unsigned long long, interrupts_enabled_mask);
/* Allow the given interrupt to be enabled next time we enable irqs. */
#define arch_local_irq_unmask(interrupt) \
(__get_cpu_var(interrupts_enabled_mask) |= (1ULL << (interrupt)))
this_cpu_or(interrupts_enabled_mask, (1ULL << (interrupt)))
/* Allow the given interrupt to be enabled immediately, if !irqs_disabled. */
#define arch_local_irq_unmask_now(interrupt) do { \