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-rw-r--r--arch/x86/Kconfig.debug9
1 files changed, 9 insertions, 0 deletions
diff --git a/arch/x86/Kconfig.debug b/arch/x86/Kconfig.debug
index 761ca7b5f12..40aba670fb3 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.
+
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