1 files changed, 9 insertions, 0 deletions

diff --git a/arch/x86/Kconfig.debug b/arch/x86/Kconfig.debug
index 761ca7b5f120..40aba670fb37 100644
--- a/arch/x86/Kconfig.debug
+++ b/arch/x86/Kconfig.debug
@@ -112,4 +112,13 @@ config IOMMU_LEAK
           Add a simple leak tracer to the IOMMU code. This is useful when you
           are debugging a buggy device driver that leaks IOMMU mappings.
 
+config UDELAY_IO_DELAY
+        bool "Delay I/O through udelay instead of outb"
+        depends on DEBUG_KERNEL
+        help
+          Make inb_p/outb_p use udelay() based delays by default. Please note
+          that udelay() does not have the same bus-level side-effects that
+          the normal outb based delay does meaning this could cause drivers
+          to change behaviour and/or bugs to surface.
+
 endmenu