diff options
Diffstat (limited to 'mm/highmem.c')
| -rw-r--r-- | mm/highmem.c | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/mm/highmem.c b/mm/highmem.c index 910198037bf5..68eb1d9b63fa 100644 --- a/mm/highmem.c +++ b/mm/highmem.c @@ -422,3 +422,48 @@ void __init page_address_init(void) } #endif /* defined(CONFIG_HIGHMEM) && !defined(WANT_PAGE_VIRTUAL) */ + +#if defined(CONFIG_DEBUG_HIGHMEM) && defined(CONFIG_TRACE_IRQFLAGS_SUPPORT) + +void debug_kmap_atomic(enum km_type type) +{ + static unsigned warn_count = 10; + + if (unlikely(warn_count == 0)) + return; + + if (unlikely(in_interrupt())) { + if (in_irq()) { + if (type != KM_IRQ0 && type != KM_IRQ1 && + type != KM_BIO_SRC_IRQ && type != KM_BIO_DST_IRQ && + type != KM_BOUNCE_READ) { + WARN_ON(1); + warn_count--; + } + } else if (!irqs_disabled()) { /* softirq */ + if (type != KM_IRQ0 && type != KM_IRQ1 && + type != KM_SOFTIRQ0 && type != KM_SOFTIRQ1 && + type != KM_SKB_SUNRPC_DATA && + type != KM_SKB_DATA_SOFTIRQ && + type != KM_BOUNCE_READ) { + WARN_ON(1); + warn_count--; + } + } + } + + if (type == KM_IRQ0 || type == KM_IRQ1 || type == KM_BOUNCE_READ || + type == KM_BIO_SRC_IRQ || type == KM_BIO_DST_IRQ) { + if (!irqs_disabled()) { + WARN_ON(1); + warn_count--; + } + } else if (type == KM_SOFTIRQ0 || type == KM_SOFTIRQ1) { + if (irq_count() == 0 && !irqs_disabled()) { + WARN_ON(1); + warn_count--; + } + } +} + +#endif |