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diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 08def8deb5f5..ecad946920d1 100644
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@@ -1882,6 +1882,12 @@ and is between 256 and 4096 characters. It is defined in the file
Format: { 0 | 1 }
See arch/parisc/kernel/pdc_chassis.c
+ percpu_alloc= [X86] Select which percpu first chunk allocator to use.
+ Allowed values are one of "lpage", "embed" and "4k".
+ See comments in arch/x86/kernel/setup_percpu.c for
+ details on each allocator. This parameter is primarily
+ for debugging and performance comparison.
+
pf. [PARIDE]
See Documentation/blockdev/paride.txt.