diff options
Diffstat (limited to 'include/linux/preempt_mask.h')
| -rw-r--r-- | include/linux/preempt_mask.h | 117 |
1 files changed, 0 insertions, 117 deletions
diff --git a/include/linux/preempt_mask.h b/include/linux/preempt_mask.h deleted file mode 100644 index dbeec4d4a3be..000000000000 --- a/include/linux/preempt_mask.h +++ /dev/null | |||
| @@ -1,117 +0,0 @@ | |||
| 1 | #ifndef LINUX_PREEMPT_MASK_H | ||
| 2 | #define LINUX_PREEMPT_MASK_H | ||
| 3 | |||
| 4 | #include <linux/preempt.h> | ||
| 5 | |||
| 6 | /* | ||
| 7 | * We put the hardirq and softirq counter into the preemption | ||
| 8 | * counter. The bitmask has the following meaning: | ||
| 9 | * | ||
| 10 | * - bits 0-7 are the preemption count (max preemption depth: 256) | ||
| 11 | * - bits 8-15 are the softirq count (max # of softirqs: 256) | ||
| 12 | * | ||
| 13 | * The hardirq count could in theory be the same as the number of | ||
| 14 | * interrupts in the system, but we run all interrupt handlers with | ||
| 15 | * interrupts disabled, so we cannot have nesting interrupts. Though | ||
| 16 | * there are a few palaeontologic drivers which reenable interrupts in | ||
| 17 | * the handler, so we need more than one bit here. | ||
| 18 | * | ||
| 19 | * PREEMPT_MASK: 0x000000ff | ||
| 20 | * SOFTIRQ_MASK: 0x0000ff00 | ||
| 21 | * HARDIRQ_MASK: 0x000f0000 | ||
| 22 | * NMI_MASK: 0x00100000 | ||
| 23 | * PREEMPT_ACTIVE: 0x00200000 | ||
| 24 | */ | ||
| 25 | #define PREEMPT_BITS 8 | ||
| 26 | #define SOFTIRQ_BITS 8 | ||
| 27 | #define HARDIRQ_BITS 4 | ||
| 28 | #define NMI_BITS 1 | ||
| 29 | |||
| 30 | #define PREEMPT_SHIFT 0 | ||
| 31 | #define SOFTIRQ_SHIFT (PREEMPT_SHIFT + PREEMPT_BITS) | ||
| 32 | #define HARDIRQ_SHIFT (SOFTIRQ_SHIFT + SOFTIRQ_BITS) | ||
| 33 | #define NMI_SHIFT (HARDIRQ_SHIFT + HARDIRQ_BITS) | ||
| 34 | |||
| 35 | #define __IRQ_MASK(x) ((1UL << (x))-1) | ||
| 36 | |||
| 37 | #define PREEMPT_MASK (__IRQ_MASK(PREEMPT_BITS) << PREEMPT_SHIFT) | ||
| 38 | #define SOFTIRQ_MASK (__IRQ_MASK(SOFTIRQ_BITS) << SOFTIRQ_SHIFT) | ||
| 39 | #define HARDIRQ_MASK (__IRQ_MASK(HARDIRQ_BITS) << HARDIRQ_SHIFT) | ||
| 40 | #define NMI_MASK (__IRQ_MASK(NMI_BITS) << NMI_SHIFT) | ||
| 41 | |||
| 42 | #define PREEMPT_OFFSET (1UL << PREEMPT_SHIFT) | ||
| 43 | #define SOFTIRQ_OFFSET (1UL << SOFTIRQ_SHIFT) | ||
| 44 | #define HARDIRQ_OFFSET (1UL << HARDIRQ_SHIFT) | ||
| 45 | #define NMI_OFFSET (1UL << NMI_SHIFT) | ||
| 46 | |||
| 47 | #define SOFTIRQ_DISABLE_OFFSET (2 * SOFTIRQ_OFFSET) | ||
| 48 | |||
| 49 | #define PREEMPT_ACTIVE_BITS 1 | ||
| 50 | #define PREEMPT_ACTIVE_SHIFT (NMI_SHIFT + NMI_BITS) | ||
| 51 | #define PREEMPT_ACTIVE (__IRQ_MASK(PREEMPT_ACTIVE_BITS) << PREEMPT_ACTIVE_SHIFT) | ||
| 52 | |||
| 53 | #define hardirq_count() (preempt_count() & HARDIRQ_MASK) | ||
| 54 | #define softirq_count() (preempt_count() & SOFTIRQ_MASK) | ||
| 55 | #define irq_count() (preempt_count() & (HARDIRQ_MASK | SOFTIRQ_MASK \ | ||
| 56 | | NMI_MASK)) | ||
| 57 | |||
| 58 | /* | ||
| 59 | * Are we doing bottom half or hardware interrupt processing? | ||
| 60 | * Are we in a softirq context? Interrupt context? | ||
| 61 | * in_softirq - Are we currently processing softirq or have bh disabled? | ||
| 62 | * in_serving_softirq - Are we currently processing softirq? | ||
| 63 | */ | ||
| 64 | #define in_irq() (hardirq_count()) | ||
| 65 | #define in_softirq() (softirq_count()) | ||
| 66 | #define in_interrupt() (irq_count()) | ||
| 67 | #define in_serving_softirq() (softirq_count() & SOFTIRQ_OFFSET) | ||
| 68 | |||
| 69 | /* | ||
| 70 | * Are we in NMI context? | ||
| 71 | */ | ||
| 72 | #define in_nmi() (preempt_count() & NMI_MASK) | ||
| 73 | |||
| 74 | #if defined(CONFIG_PREEMPT_COUNT) | ||
| 75 | # define PREEMPT_CHECK_OFFSET 1 | ||
| 76 | #else | ||
| 77 | # define PREEMPT_CHECK_OFFSET 0 | ||
| 78 | #endif | ||
| 79 | |||
| 80 | /* | ||
| 81 | * The preempt_count offset needed for things like: | ||
| 82 | * | ||
| 83 | * spin_lock_bh() | ||
| 84 | * | ||
| 85 | * Which need to disable both preemption (CONFIG_PREEMPT_COUNT) and | ||
| 86 | * softirqs, such that unlock sequences of: | ||
| 87 | * | ||
| 88 | * spin_unlock(); | ||
| 89 | * local_bh_enable(); | ||
| 90 | * | ||
| 91 | * Work as expected. | ||
| 92 | */ | ||
| 93 | #define SOFTIRQ_LOCK_OFFSET (SOFTIRQ_DISABLE_OFFSET + PREEMPT_CHECK_OFFSET) | ||
| 94 | |||
| 95 | /* | ||
| 96 | * Are we running in atomic context? WARNING: this macro cannot | ||
| 97 | * always detect atomic context; in particular, it cannot know about | ||
| 98 | * held spinlocks in non-preemptible kernels. Thus it should not be | ||
| 99 | * used in the general case to determine whether sleeping is possible. | ||
| 100 | * Do not use in_atomic() in driver code. | ||
| 101 | */ | ||
| 102 | #define in_atomic() ((preempt_count() & ~PREEMPT_ACTIVE) != 0) | ||
| 103 | |||
| 104 | /* | ||
| 105 | * Check whether we were atomic before we did preempt_disable(): | ||
| 106 | * (used by the scheduler, *after* releasing the kernel lock) | ||
| 107 | */ | ||
| 108 | #define in_atomic_preempt_off() \ | ||
| 109 | ((preempt_count() & ~PREEMPT_ACTIVE) != PREEMPT_CHECK_OFFSET) | ||
| 110 | |||
| 111 | #ifdef CONFIG_PREEMPT_COUNT | ||
| 112 | # define preemptible() (preempt_count() == 0 && !irqs_disabled()) | ||
| 113 | #else | ||
| 114 | # define preemptible() 0 | ||
| 115 | #endif | ||
| 116 | |||
| 117 | #endif /* LINUX_PREEMPT_MASK_H */ | ||