doc/kernel-parameters.txt: add early_ioremap_debug

Add description of early_ioremap_debug kernel parameter.

Signed-off-by: Mark Salter <msalter@redhat.com>
Cc: Borislav Petkov <borislav.petkov@amd.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Dave Young <dyoung@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 5 insertions, 0 deletions

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index bc3478581f67..b6c67d592be5 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -884,6 +884,11 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
                         Enable debug messages at boot time.  See
                         Documentation/dynamic-debug-howto.txt for details.
 
+        early_ioremap_debug [KNL]
+                        Enable debug messages in early_ioremap support. This
+                        is useful for tracking down temporary early mappings
+                        which are not unmapped.
+
         earlycon=       [KNL] Output early console device and options.
                 uart[8250],io,<addr>[,options]
                 uart[8250],mmio,<addr>[,options]