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 (file)
--- a/arch/x86/mm/highmem_32.c
+++ b/arch/x86/mm/highmem_32.c
@@ -19,49 +19,6 @@ void kunmap(struct page *page)
        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 @@ void *kmap_atomic_prot(struct page *page, enum km_type type, pgprot_t prot)
        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);

diff --git a/include/linux/highmem.h b/include/linux/highmem.h
index 13875ce..7ff5c55 100644 (file)
--- a/include/linux/highmem.h
+++ b/include/linux/highmem.h
@@ -187,4 +187,16 @@ static inline void copy_highpage(struct page *to, struct page *from)
        kunmap_atomic(vto, KM_USER1);
 }
 
+#if defined(CONFIG_DEBUG_HIGHMEM) && defined(CONFIG_TRACE_IRQFLAGS_SUPPORT)
+
+void debug_kmap_atomic(enum km_type type);
+
+#else
+
+static inline void debug_kmap_atomic(enum km_type type)
+{
+}
+
+#endif
+
 #endif /* _LINUX_HIGHMEM_H */

diff --git a/mm/highmem.c b/mm/highmem.c
index 9101980..68eb1d9 100644 (file)
--- 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