x86: soften multi-BAR mapping sanity check warning message

Impact: make debug warning less scary

The ioremap() time multi-BAR map warning has been causing false
positives:

  http://lkml.org/lkml/2008/12/10/432
  http://lkml.org/lkml/2008/12/11/136

So make it less scary by making it once-per-boot, by making it KERN_INFO
and by adding this text:

  "Info: mapping multiple BARs. Your kernel is fine."

Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/arch/x86/mm/ioremap.c b/arch/x86/mm/ioremap.c
index d4c4307..bd85d42 100644 (file)
--- a/arch/x86/mm/ioremap.c
+++ b/arch/x86/mm/ioremap.c
@@ -223,7 +223,8 @@ static void __iomem *__ioremap_caller(resource_size_t phys_addr,
         * Check if the request spans more than any BAR in the iomem resource
         * tree.
         */
-       WARN_ON(iomem_map_sanity_check(phys_addr, size));
+       WARN_ONCE(iomem_map_sanity_check(phys_addr, size),
+                 KERN_INFO "Info: mapping multiple BARs. Your kernel is fine.");
 
        /*
         * Don't allow anybody to remap normal RAM that we're using..