x86/mm: Drop WARN from multi-BAR check

ioremapping multiple BARs produces a warning with a message "Your kernel is
fine". This message mostly serves to comfort kernel developers. Users do
not read the message, they only see the big scary warning which means
something must be horribly broken with their system. Less dramatically, the
warn also sets the taint flag which makes it difficult to differentiate
problems. If the kernel is actually fine as the warning claims it doesn't
make sense for it to be tainted. Change the WARN_ONCE to a pr_warn with the
caller of the ioremap.

Signed-off-by: Laura Abbott <labbott@fedoraproject.org>
Link: http://lkml.kernel.org/r/1450728074-31029-1-git-send-email-labbott@fedoraproject.org
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

arch/x86/mm/ioremap.c

@@ -194,8 +194,8 @@ 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_ONCE(iomem_map_sanity_check(unaligned_phys_addr, unaligned_size),
-		  KERN_INFO "Info: mapping multiple BARs. Your kernel is fine.");
+	if (iomem_map_sanity_check(unaligned_phys_addr, unaligned_size))
+		pr_warn("caller %pS mapping multiple BARs\n", caller);
 
 	return ret_addr;
 err_free_area: