1 files changed, 31 insertions, 27 deletions

diff --git a/arch/um/Kconfig b/arch/um/Kconfig
index ec9711d068b7..6b6eb938fcc1 100644
--- a/arch/um/Kconfig
+++ b/arch/um/Kconfig
@@ -80,46 +80,46 @@ config LD_SCRIPT_DYN
         bool
         default y
         depends on !LD_SCRIPT_STATIC
-        select MODULE_REL_CRCS if MODVERSIONS
+        select MODULE_REL_CRCS if MODVERSIONS
 
 config HOSTFS
         tristate "Host filesystem"
         help
-          While the User-Mode Linux port uses its own root file system for
-          booting and normal file access, this module lets the UML user
-          access files stored on the host.  It does not require any
-          network connection between the Host and UML.  An example use of
-          this might be:
+          While the User-Mode Linux port uses its own root file system for
+          booting and normal file access, this module lets the UML user
+          access files stored on the host.  It does not require any
+          network connection between the Host and UML.  An example use of
+          this might be:
 
-          mount none /tmp/fromhost -t hostfs -o /tmp/umlshare
+          mount none /tmp/fromhost -t hostfs -o /tmp/umlshare
 
-          where /tmp/fromhost is an empty directory inside UML and
-          /tmp/umlshare is a directory on the host with files the UML user
-          wishes to access.
+          where /tmp/fromhost is an empty directory inside UML and
+          /tmp/umlshare is a directory on the host with files the UML user
+          wishes to access.
 
-          For more information, see
-          <http://user-mode-linux.sourceforge.net/hostfs.html>.
+          For more information, see
+          <http://user-mode-linux.sourceforge.net/hostfs.html>.
 
-          If you'd like to be able to work with files stored on the host,
-          say Y or M here; otherwise say N.
+          If you'd like to be able to work with files stored on the host,
+          say Y or M here; otherwise say N.
 
 config MCONSOLE
         bool "Management console"
         depends on PROC_FS
         default y
         help
-          The user mode linux management console is a low-level interface to
-          the kernel, somewhat like the i386 SysRq interface.  Since there is
-          a full-blown operating system running under every user mode linux
-          instance, there is much greater flexibility possible than with the
-          SysRq mechanism.
+          The user mode linux management console is a low-level interface to
+          the kernel, somewhat like the i386 SysRq interface.  Since there is
+          a full-blown operating system running under every user mode linux
+          instance, there is much greater flexibility possible than with the
+          SysRq mechanism.
 
-          If you answer 'Y' to this option, to use this feature, you need the
-          mconsole client (called uml_mconsole) which is present in CVS in
-          2.4.5-9um and later (path /tools/mconsole), and is also in the
-          distribution RPM package in 2.4.6 and later.
+          If you answer 'Y' to this option, to use this feature, you need the
+          mconsole client (called uml_mconsole) which is present in CVS in
+          2.4.5-9um and later (path /tools/mconsole), and is also in the
+          distribution RPM package in 2.4.6 and later.
 
-          It is safe to say 'Y' here.
+          It is safe to say 'Y' here.
 
 config MAGIC_SYSRQ
         bool "Magic SysRq key"
@@ -142,13 +142,17 @@ config MAGIC_SYSRQ
 
 config KERNEL_STACK_ORDER
         int "Kernel stack size order"
-        default 1 if 64BIT
-        range 1 10 if 64BIT
-        default 0 if !64BIT
+        default 2 if 64BIT
+        range 2 10 if 64BIT
+        default 1 if !64BIT
         help
           This option determines the size of UML kernel stacks.  They will
           be 1 << order pages.  The default is OK unless you're running Valgrind
           on UML, in which case, set this to 3.
+          It is possible to reduce the stack to 1 for 64BIT and 0 for 32BIT on
+          older (pre-2017) CPUs. It is not recommended on newer CPUs due to the
+          increase in the size of the state which needs to be saved when handling
+          signals.
 
 config MMAPPER
         tristate "iomem emulation driver"