mm/Kconfig: fix URL for zsmalloc benchmark

The help text for CONFIG_PGTABLE_MAPPING has an incorrect URL.  While
we're at it, remove the unnecessary footnote notation.

Signed-off-by: Ben Hutchings <>
Acked-by: Minchan Kim <>
Signed-off-by: Andrew Morton <>
Signed-off-by: Linus Torvalds <>
diff --git a/mm/Kconfig b/mm/Kconfig
index 2d9f150..2888024 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -575,5 +575,5 @@
 	  then you should select this. This causes zsmalloc to use page table
 	  mapping rather than copying for object mapping.
-	  You can check speed with zsmalloc benchmark[1].
-	  [1]
+	  You can check speed with zsmalloc benchmark: