Documentation/kernel-parameters.txt: update mem= option's spec according to its imple...

Current mem= implementation seems buggy because the specification and
implementation don't match.  The current mem= has been working for many
years and it's not buggy - it works as expected.  So we should update the
specification.

Signed-off-by: Wen Congyang <wency@cn.fujitsu.com>
Cc: Rob Landley <rob@landley.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 9776f068306b7f7ec6425ec4c02b17f5dac4788a..91863a53e432592adb53b77ce9b76b0a527f0ec7 100644 (file)
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -1481,9 +1481,10 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
        mem=nn[KMG]     [KNL,BOOT] Force usage of a specific amount of memory
                        Amount of memory to be used when the kernel is not able
                        to see the whole system memory or for test.
-                       [X86-32] Use together with memmap= to avoid physical
-                       address space collisions. Without memmap= PCI devices
-                       could be placed at addresses belonging to unused RAM.
+                       [X86] Work as limiting max address. Use together
+                       with memmap= to avoid physical address space collisions.
+                       Without memmap= PCI devices could be placed at addresses
+                       belonging to unused RAM.
 
        mem=nopentium   [BUGS=X86-32] Disable usage of 4MB pages for kernel
                        memory.