mm: introduce debug_kmap_atomic
x86 has debug_kmap_atomic_prot() which is error checking function for
kmap_atomic. It is usefull for the other architectures, although it needs
CONFIG_TRACE_IRQFLAGS_SUPPORT.
This patch exposes it to the other architectures.
Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: <linux-arch@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/arch/x86/mm/highmem_32.c b/arch/x86/mm/highmem_32.c
index 522db5e..8126e8d 100644
--- a/arch/x86/mm/highmem_32.c
+++ b/arch/x86/mm/highmem_32.c
@@ -19,49 +19,6 @@
kunmap_high(page);
}
-static void debug_kmap_atomic_prot(enum km_type type)
-{
-#ifdef CONFIG_DEBUG_HIGHMEM
- 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
-}
-
/*
* kmap_atomic/kunmap_atomic is significantly faster than kmap/kunmap because
* no global lock is needed and because the kmap code must perform a global TLB
@@ -81,7 +38,7 @@
if (!PageHighMem(page))
return page_address(page);
- debug_kmap_atomic_prot(type);
+ debug_kmap_atomic(type);
idx = type + KM_TYPE_NR*smp_processor_id();
vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx);