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>

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